CompTIA A+ Core 1 220-1201 220-1201 Questions 226–300 | Page 4/12

226

MCQmedium

A user reports intermittent network drops. You suspect the issue might be with the network interface card (NIC) itself. You need to test the NIC's ability to send and receive data without connecting it to the network. Which tool should you use?

A.Cable tester

B.Toner probe

C.Loopback plug

D.Multimeter

AnswerC

A loopback plug terminates transmit pins back into receive pins, so the NIC's own send and receive circuitry is exercised without any network connection. Successful loopback confirms the adapter functions, isolating the fault to cabling or switch infrastructure rather than the card.

Why this answer

A loopback plug (or loopback adapter) is the correct tool because it connects the transmit (TX) and receive (RX) pins of the NIC, allowing it to send data to itself. This tests the NIC's ability to transmit and receive frames without requiring a network connection, isolating the NIC as the potential fault point.

Exam trap

CompTIA often tests the distinction between testing the NIC itself (loopback plug) versus testing the cable (cable tester), leading candidates to confuse a cable tester as a valid NIC diagnostic tool.

How to eliminate wrong answers

Option A is wrong because a cable tester is used to verify the integrity and wiring of Ethernet cables (e.g., checking for opens, shorts, or miswires), not to test a NIC's internal send/receive capability. Option B is wrong because a toner probe is used to trace and identify specific cables within a bundle by injecting an analog tone, not to test NIC functionality. Option D is wrong because a multimeter measures electrical properties like voltage, resistance, and continuity, which cannot validate Layer 2 data transmission or NIC operation.

Full explanation →

227

MCQeasy

During a network upgrade, a technician needs to ensure that all devices on a small office LAN receive IP addresses automatically from a central server. Which protocol must be running on that server?

A.DNS

B.HTTP

C.DHCP

D.FTP

AnswerC

DHCP automatically assigns IP addresses, subnet masks, gateways and DNS settings from a central server, eliminating manual configuration. Running it on the server satisfies the requirement that all LAN devices receive addresses automatically, which static addressing or DNS alone cannot provide.

Why this answer

The Dynamic Host Configuration Protocol (DHCP) is the correct answer because it is specifically designed to automatically assign IP addresses, subnet masks, default gateways, and other network configuration parameters to devices on a LAN. A DHCP server listens on UDP port 67 and responds to client requests on UDP port 68, enabling zero-touch IP configuration for all devices on the network.

Exam trap

CompTIA often tests the distinction between DHCP and DNS, as candidates may confuse name resolution with IP address assignment, especially when both services are commonly run on the same server.

How to eliminate wrong answers

Option A is wrong because DNS (Domain Name System) resolves domain names to IP addresses but does not assign IP addresses to devices. Option B is wrong because HTTP (Hypertext Transfer Protocol) is used for transferring web content between clients and servers, not for automatic IP address assignment. Option D is wrong because FTP (File Transfer Protocol) is used for transferring files between a client and a server on a network, and it has no role in IP address allocation.

Full explanation →

228

MCQmedium

A technician is configuring a RAID 10 array for a database server using four 500 GB SSDs. After setup, the array shows a total capacity of 1 TB instead of 2 TB. What is the most likely reason for this discrepancy?

A.The RAID controller is faulty.

B.The array was accidentally configured as RAID 1.

C.The drives are not all the same size.

D.RAID 10 uses half the total capacity for mirroring.

AnswerD

RAID 10, also known as RAID 1+0, combines mirroring (RAID 1) and striping (RAID 0). It first creates mirrored pairs of drives, and then stripes data across these mirrored sets. With four 500 GB drives, two 500 GB drives form a 500 GB mirrored volume, and the other two form a second 500 GB mirrored volume. These two 500 GB logical volumes are then striped together, resulting in a total usable capacity of 1 TB, which is exactly half of the raw 2 TB capacity.

Why this answer

RAID 10 combines mirroring (RAID 1) and striping (RAID 0). With four 500 GB drives, RAID 10 creates two mirrored pairs, each pair having 500 GB usable capacity, then stripes across them. Total usable capacity is 1 TB (500 GB x 2), because half the raw capacity is used for mirroring redundancy.

Exam trap

The trap is misunderstanding RAID 10 capacity calculation; candidates often forget that mirroring halves usable capacity, leading them to expect full raw capacity or misattribute the discrepancy to a fault.

How to eliminate wrong answers

Option A is wrong because a faulty controller would likely cause array failure or degraded performance, not a consistent capacity reduction. Option B is wrong because RAID 1 with four drives would typically create two separate mirrors or a single mirror of two drives, yielding 1 TB usable, but the question states RAID 10 was configured; accidental RAID 1 is possible but less likely than the inherent capacity overhead of RAID 10. Option C is wrong because mismatched drive sizes would result in capacity based on the smallest drive, but all drives are 500 GB, so this is not the cause.

Full explanation →

229

MCQmedium

A company's web server is accessible from the internet, but users report that the website loads slowly. The server's public IP is 203.0.113.10, and the internal IP is 192.168.1.10. The network administrator notices that the router's port forwarding rule is set to forward port 80 to 192.168.1.10:8080. What is the likely cause of the slow performance?

A.The DNS server is misconfigured

B.The NAT table is full

C.The port forwarding rule uses the wrong internal port

D.The DHCP scope is exhausted

AnswerC

If the port forwarding rule directs incoming internet traffic for the web server to an incorrect internal port (e.g., forwarding external port 80 to internal port 8080, while the web server is actually listening on internal port 80), the connection will fail to establish properly. The router successfully receives the request but sends it to a port where no service is listening, or to the wrong service. This often results in connection timeouts, significant delays, or eventual connection resets as the client waits for a response from the non-existent or incorrect service.

Why this answer

Port forwarding should map external port 80 to the server's internal port 80, not 8080 unless the server listens on 8080. If the server listens on port 80, the mismatch causes connection delays or errors as the router forwards to a closed port. Correcting the internal port resolves the issue.

Full explanation →

230

MCQmedium

A user reports that their iPad will not rotate the screen when the device is turned sideways, even though rotation lock is off. The issue started after a recent iOS update. What is the most likely cause?

A.The accelerometer sensor is damaged.

B.The app being used does not support landscape mode.

C.The rotation lock is enabled in the Control Center.

D.The iOS update corrupted the display driver.

AnswerC

iOS and iPadOS devices incorporate a rotation lock feature, typically accessible through the Control Center, which explicitly prevents the screen from automatically reorienting based on the device's physical position. When this lock is activated, the operating system intentionally disregards input from the accelerometer, causing the display to remain fixed in its current orientation. This common user-enabled setting directly overrides the automatic rotation function, making it the most probable cause for a sudden inability to rotate.

Why this answer

The most common cause of screen rotation failure after an iOS update is that the update resets or changes Control Center settings, re-enabling the rotation lock. The user may have rotation lock off in Settings but it can be toggled on in Control Center without their knowledge, as iOS updates can alter Control Center configurations. The accelerometer and display driver are unlikely to be affected by a standard iOS update, and the issue is system-wide, not app-specific.

Exam trap

The 220-1201 exam often tests the misconception that hardware failures are the primary cause of post-update issues, but the trap here is that candidates overlook the simple software toggle in Control Center, assuming the user's statement 'rotation lock is off' refers only to the Settings app, not the Control Center override.

How to eliminate wrong answers

Option A is wrong because a damaged accelerometer would cause rotation issues regardless of rotation lock status and would not be triggered by a software update; hardware damage is not a typical consequence of an iOS update. Option B is wrong because the user reports the issue started after an iOS update and affects the device system-wide, not just a single app; if only one app lacked landscape support, other apps would still rotate. Option D is wrong because iOS updates do not corrupt display drivers; display drivers are part of the iOS kernel and are updated atomically, and a corrupted driver would cause display artifacts or a black screen, not just rotation failure.

Full explanation →

231

MCQeasy

A user complains that they cannot access a website by its domain name, but they can access it by typing the IP address directly. The user's computer is configured to obtain DNS automatically. What is the most likely issue?

A.The user's computer has a static IP address that conflicts with another device.

B.The DNS server is not responding or is misconfigured.

C.The user's browser cache is corrupted.

D.The website's IP address has changed.

AnswerB

Name resolution fails while direct IP connectivity succeeds, proving the network path and default gateway work. Since the client obtains DNS automatically, the fault lies with the DHCP-supplied DNS server address or the server itself, so it cannot resolve the domain name to an IP.

Why this answer

The user can access the website by IP address but not by domain name, which indicates that DNS resolution is failing. Since the computer is configured to obtain DNS automatically, the most likely cause is that the DNS server assigned by DHCP is not responding or is misconfigured, preventing the translation of the domain name to an IP address.

Exam trap

The trap here is that candidates may confuse a DNS server problem with a browser cache issue or an IP address change, but the key clue is that direct IP access works while domain name access does not.

How to eliminate wrong answers

Option A is wrong because a static IP address conflict would cause network connectivity issues in general, not specifically prevent DNS resolution while allowing access by IP address. Option C is wrong because a corrupted browser cache might cause display or performance issues, but it would not prevent DNS resolution, which occurs at the OS level before the browser sends the request. Option D is wrong because if the website's IP address had changed, the user would still be able to access it by the new IP address directly, but the domain name would resolve to the old IP address, not fail entirely; the symptom of being unable to access by domain name at all points to a DNS server issue, not a changed IP.

Full explanation →

232

MCQmedium

A technician is troubleshooting a laptop that has a blinking battery light and will not power on, even when plugged into AC power. The technician has already verified the AC adapter is working on another laptop. Which component is most likely faulty?

A.The CPU

B.The RAM

C.The battery

D.The hard drive

AnswerC

A failed or deeply discharged battery is the most probable cause for a laptop's battery indicator light to blink and prevent the system from powering on, even when connected to AC power. Many laptops are designed to refuse to boot if the battery is critically low or completely failed, as a safety measure or because the power management integrated circuit (PMIC) cannot properly regulate power without a functional battery. The blinking light often serves as a specific diagnostic code indicating a battery fault or an inability to charge.

Why this answer

A blinking battery light often indicates a battery or charging circuit error. Since the AC adapter is known to be good, the issue is likely with the laptop's internal battery, the DC jack, or the charging circuit on the motherboard. The battery is the most common failure point.

Full explanation →

233

MCQeasy

A user complains that their cloud-hosted virtual desktop is slow to open applications and frequently disconnects. They are using a satellite internet connection. Which cloud characteristic is most likely being impacted?

A.High availability

B.Elasticity

C.Latency

D.Scalability

AnswerC

Latency is the time delay between a user's action (e.g., a mouse click or keystroke) and the corresponding response from the cloud-hosted virtual desktop, measured in milliseconds. High latency significantly degrades the user experience by causing noticeable input lag, delayed screen updates, and an overall sluggish feel, making interactive tasks frustrating. Factors like geographical distance, network congestion, and the type of internet connection (e.g., satellite links) directly contribute to increased latency.

Why this answer

Latency is the delay between a request and a response, and satellite internet inherently has high latency (typically 500–700 ms round-trip) due to the signal traveling to geostationary orbit and back. This delay directly impacts interactive cloud services like virtual desktops, causing slow application launches and frequent disconnects because the remote desktop protocol (e.g., RDP, ICA) is sensitive to round-trip time. High availability, elasticity, and scalability are cloud provider characteristics that are not directly affected by the user's network latency.

Exam trap

The trap here is confusing network performance issues (latency) with cloud service characteristics (high availability, elasticity, scalability), leading candidates to choose a cloud feature that sounds related to performance but is not the direct cause.

How to eliminate wrong answers

Option A is wrong because high availability refers to a system's ability to remain operational and accessible, typically achieved through redundancy and failover; the user's issue is not about the service being down but about slow performance due to network delay. Option B is wrong because elasticity is the ability to automatically scale resources up or down based on demand, which is a cloud provider feature and unrelated to the user's satellite latency. Option D is wrong because scalability is the capacity to handle growth by adding resources, which again is a cloud characteristic not impacted by the user's connection latency.

Full explanation →

234

MCQmedium

A technician is setting up a wireless network for a small office that experiences heavy interference from neighboring businesses. The office uses many Bluetooth devices and cordless phones. Which 802.11 standard and frequency combination would minimize interference and provide the best performance?

A.802.11b/g on 2.4 GHz

B.802.11n on 2.4 GHz

C.802.11ac on 5 GHz

D.802.11ax on 2.4 GHz

AnswerC

802.11ac is an excellent choice as it operates exclusively within the 5 GHz frequency band. This band offers a significantly larger number of non-overlapping channels and is far less susceptible to interference from common household appliances and older wireless technologies that crowd the 2.4 GHz spectrum. This allows 802.11ac to achieve much higher data rates and provide a more stable, high-performance wireless experience, ideal for demanding applications.

Why this answer

802.11ac operates exclusively on the 5 GHz frequency band, which is far less congested than 2.4 GHz. This avoids interference from Bluetooth devices and cordless phones (which predominantly use 2.4 GHz), providing cleaner channels and better performance in a dense interference environment.

Exam trap

The 220-1201 exam often tests the misconception that newer standards like 802.11ax automatically solve interference problems, but the trap is that the frequency band choice (2.4 GHz vs. 5 GHz) is the primary factor in avoiding interference from common office devices like Bluetooth and cordless phones.

How to eliminate wrong answers

Option A is wrong because 802.11b/g operates only on the 2.4 GHz band, which is heavily shared with Bluetooth and cordless phones, leading to severe co-channel interference and poor performance. Option B is wrong because 802.11n on 2.4 GHz still uses the same crowded band, and while it offers better throughput than b/g, it does not avoid the interference sources. Option D is wrong because 802.11ax (Wi-Fi 6) on 2.4 GHz, despite its advanced OFDMA and BSS coloring features, still operates in the congested 2.4 GHz spectrum and will experience interference from Bluetooth and cordless phones; the question asks for the combination that minimizes interference, and 5 GHz is inherently less crowded.

Full explanation →

235

MCQmedium

A user reports that their laser printer prints a blank page after every print job. The document itself prints correctly, but an extra blank sheet follows. What is the most likely cause?

A.The printer has a low toner cartridge

B.The printer driver is set to print a separator page

C.The fuser is malfunctioning

D.The paper size setting is wrong

AnswerB

A separator page is a specific feature configured within the printer driver or server settings, designed to print an additional page, often blank or containing job information like the user's name, job title, and print time, either before or after a print job. This setting is commonly used in shared network environments to distinguish between print jobs from different users. When enabled, the driver explicitly instructs the printer to feed and print this extra page, directly causing the symptom of an unexpected blank page accompanying a document.

Why this answer

A separator page is a printer configuration that inserts a blank or informational page between print jobs. If the printer driver is set to print a separator page, it will output an extra page after each job, which matches the symptom of a blank page following every print job. The other options would cause different symptoms, such as poor print quality or jamming.

Exam trap

220-1201 often tests printer symptoms and their causes, and candidates may overlook simple configuration issues like separator pages, instead suspecting hardware failures.

How to eliminate wrong answers

Option A is wrong because low toner would cause faded or streaky prints, not a completely blank page after each job. Option C is wrong because a malfunctioning fuser would cause toner not to fuse properly, leading to smudging or peeling, not an extra blank page. Option D is wrong because incorrect paper size settings would cause formatting issues or jams, not a consistent blank page after each job.

Full explanation →

236

MCQmedium

A customer complains that their computer will not turn on. The power supply fan does not spin, and the motherboard LED is off. The technician tests the power supply with a multimeter and gets 0V on all pins. What should the technician do next?

A.Replace the motherboard.

B.Reseat the 24-pin power connector.

C.Replace the power supply with a known-good unit.

D.Check the wall outlet with a voltage tester.

AnswerD

Checking the wall outlet with a voltage tester is the correct and most logical first step when a computer fails to turn on. This action directly verifies the primary power source, confirming whether AC voltage is present and sufficient at the point of connection. This diagnostic step quickly rules out external issues such as a tripped circuit breaker, a faulty outlet, or a problem with the building's electrical wiring, thereby isolating the problem to either the external power source or the computer's internal power components.

Why this answer

The technician measured 0V on all power supply pins with a multimeter, which indicates the PSU is not receiving power or is completely dead. Before replacing the PSU, the next logical step is to verify the power source — checking the wall outlet with a voltage tester confirms whether the outlet is supplying power. If the outlet is dead, replacing the PSU would not solve the problem.

Exam trap

220-1201 often tests troubleshooting order — candidates jump to replacing components (PSU, motherboard) before verifying the simplest external cause (wall outlet), missing that 0V on all pins points to an input power problem first.

How to eliminate wrong answers

Option A is wrong because replacing the motherboard is premature — the symptom (no fan, no LED, 0V on PSU pins) points to power delivery, not the motherboard, and the outlet has not been ruled out. Option B is wrong because reseating the 24-pin connector would not help if the outlet itself is dead; also, 0V on all pins with the PSU connected suggests no input power rather than a loose connector. Option C is wrong because replacing the PSU is premature until the wall outlet is verified — if the outlet is dead, a new PSU will also show 0V.

Full explanation →

237

MCQhard

A user's iPhone 14 cannot make or receive calls, but can send iMessages and use the internet. The user has not changed any settings recently. What is the most likely cause?

A.The phone is in Airplane Mode.

B.The SIM card is damaged.

C.The carrier settings need to be updated.

D.The phone's microphone is broken.

AnswerC

Carrier settings are configuration files provided by the mobile network operator that enable the iPhone to connect to their specific network services, including voice, data, and messaging. Outdated or corrupted carrier settings can specifically disrupt voice call functionality, such as VoLTE (Voice over LTE) provisioning, while other services like mobile data might remain operational. Updating these settings often resolves issues related to call initiation, reception, or quality by ensuring the phone uses the correct network parameters.

Why this answer

The ability to send iMessages and use the internet indicates that the device has a working data connection (cellular or Wi-Fi), but the inability to make or receive calls points to a problem with the carrier-specific settings that control voice services. Carrier settings updates are pushed by the carrier to configure network parameters such as APN, MMS, and voice-over-LTE (VoLTE) settings; if these are outdated or corrupted, voice calls may fail while data services remain functional. Since the user has not changed any settings, an automatic or pending carrier settings update is the most likely cause, as it can resolve mismatches between the device and the carrier's network.

Exam trap

The 220-1201 exam often tests the distinction between data and voice services to see if candidates understand that iMessages and internet use IP-based connectivity (cellular data or Wi-Fi), while traditional voice calls rely on carrier-specific circuit-switched or VoLTE configurations that are independent of the data APN.

How to eliminate wrong answers

Option A is wrong because Airplane Mode disables all wireless radios (cellular, Wi-Fi, Bluetooth), which would prevent both iMessages and internet usage, not just calls. Option B is wrong because a damaged SIM card would typically cause a complete loss of cellular connectivity, including data services, and the phone would show 'No SIM' or 'Invalid SIM' errors; it would not selectively break only voice calls while leaving iMessages and internet working. Option D is wrong because a broken microphone would affect the ability to transmit audio during calls, but it would not prevent the phone from making or receiving calls entirely; the call would still connect, and the other party would simply not hear the user.

Full explanation →

238

MCQmedium

A user reports that they can only access the internet intermittently. The technician runs ipconfig and sees an IPv4 address of 192.168.1.105 with a subnet mask of 255.255.255.0 and a default gateway of 192.168.1.1. The technician pings the gateway successfully, but pings to 8.8.8.8 fail. What is the most likely issue?

A.The user's computer has a duplicate IP address.

B.The DNS server is not resolving addresses.

C.The router's WAN connection is down or misconfigured.

D.The user's firewall is blocking ICMP traffic.

AnswerC

If a user can successfully access local network resources, such as pinging their default gateway, but cannot reach any external IP addresses like 8.8.8.8, it strongly indicates a problem beyond the local network segment. The router's Wide Area Network (WAN) interface is specifically responsible for establishing and maintaining the connection between the internal network and the Internet Service Provider (ISP). A down or misconfigured WAN connection would effectively sever all outbound traffic from reaching the broader internet, while still allowing internal network communication to function normally.

Why this answer

The technician can ping the local gateway (192.168.1.1) successfully, which confirms that Layer 2 and Layer 3 connectivity within the local subnet is working and that the user's IP configuration is valid. However, pings to the public DNS server 8.8.8.8 fail, indicating that traffic cannot reach the internet. Since the gateway is reachable but external IPs are not, the most likely cause is that the router's WAN connection is down or misconfigured, preventing traffic from being routed beyond the local network.

Exam trap

The 220-1201 exam often tests the distinction between local and remote connectivity; the trap here is that candidates assume a successful ping to the gateway implies full internet access, but they overlook that the router's WAN link is a separate point of failure that does not affect LAN-side reachability.

How to eliminate wrong answers

Option A is wrong because a duplicate IP address would cause intermittent connectivity and ARP conflicts, but the technician successfully pings the gateway, which would not be consistently possible if another device had the same IP. Option B is wrong because the ping test used the IP address 8.8.8.8, not a hostname, so DNS resolution is not involved in this failure. Option D is wrong because the user's firewall blocking ICMP would only affect the ping replies from the user's own machine, but the technician is pinging from the user's computer to 8.8.8.8; if the firewall were blocking outbound ICMP, the ping to the gateway would also fail, which it did not.

Full explanation →

239

MCQeasy

A technician is deploying a new virtual machine on a Type 2 hypervisor (hosted) for software testing. The host machine runs Windows 10 Pro with 16 GB RAM and a quad-core CPU. The test application requires 4 GB RAM and two virtual CPUs. After creating the VM with those settings, the technician notices the host becomes extremely sluggish even when the VM is idle. What is the most likely reason for this?

A.The hypervisor does not support hardware acceleration for the guest OS.

B.The host machine’s CPU does not support Intel VT-x or AMD-V.

C.The technician allocated too much RAM to the VM, leaving insufficient memory for the host OS.

D.The virtual switch is misconfigured, causing network loops.

AnswerB

This is the correct answer. Intel VT-x and AMD-V are crucial CPU virtualization extensions that allow a hypervisor to run guest operating systems directly on the CPU with minimal overhead. Without these hardware assists, the hypervisor must perform extensive software emulation, translating guest instructions into host instructions in real-time. This continuous software-based translation consumes significant CPU resources, creating constant overhead that degrades the host machine's overall performance, even when the virtual machine is idle.

Why this answer

Type 2 hypervisors rely on hardware virtualization extensions (Intel VT-x or AMD-V) to run virtual machines efficiently. If the host CPU does not support these extensions (or they are disabled in the BIOS), the hypervisor falls back to software emulation, which imposes heavy overhead on the host CPU. This overhead is present even when the VM is idle because the hypervisor must constantly manage emulated instructions.

With the host running Windows 10 Pro and a quad-core CPU, the software emulation can cause the host to become sluggish. Allocating only 4 GB RAM to the VM leaves 12 GB for the host, which is sufficient for Windows 10 Pro and typical background processes, so option C is unlikely to be the cause.

Exam trap

Many candidates assume that host sluggishness is always due to RAM overallocation, but on a Type 2 hypervisor, the absence of hardware virtualization extensions can cause performance degradation even with modest VM resources.

Full explanation →

240

MCQhard

A technician is troubleshooting a wireless network where users report intermittent connectivity and slow speeds. A spectrum analyzer shows high noise levels on the 2.4 GHz band from non-Wi-Fi sources. Which of the following is the MOST effective long-term solution?

A.Reduce the 2.4 GHz channel width to 20 MHz.

B.Implement DFS channels on the 5 GHz band.

C.Move all critical devices to the 5 GHz band.

D.Increase the transmit power on the 2.4 GHz radio.

AnswerC

Moving critical devices to the 5 GHz band is an effective solution because this frequency spectrum is significantly less susceptible to interference from common non-Wi-Fi sources like microwave ovens, cordless phones, and Bluetooth devices, which predominantly operate in the 2.4 GHz band. The 5 GHz band also offers more non-overlapping channels, leading to less congestion from neighboring Wi-Fi networks and generally higher potential throughput, providing a more stable and reliable connection for essential devices.

Why this answer

The 5 GHz band has significantly more non-overlapping channels and is far less congested by non-Wi-Fi interference (e.g., microwaves, Bluetooth, cordless phones) than the 2.4 GHz band. Moving critical devices to 5 GHz avoids the interference source entirely, providing a stable long-term solution without compromising throughput or reliability.

Exam trap

CompTIA often tests the misconception that reducing channel width or increasing power can overcome interference, when in fact the most effective long-term solution is to move clients to a less congested frequency band.

How to eliminate wrong answers

Option A is wrong because reducing the 2.4 GHz channel width to 20 MHz may slightly improve noise immunity but does not eliminate the root cause—non-Wi-Fi interference—and reduces peak data rates. Option B is wrong because DFS channels on 5 GHz are designed to avoid radar interference, not to mitigate non-Wi-Fi interference on the 2.4 GHz band; they do not address the reported problem. Option D is wrong because increasing transmit power on 2.4 GHz can amplify the interference signal as well, potentially worsening co-channel interference and violating regulatory limits without solving the underlying noise issue.

Full explanation →

241

MCQmedium

A company uses a PaaS provider to deploy a custom web application. After an update, the application fails to start. The developer checks the code and finds no errors. What is the most likely cause of the failure?

A.The developer's local machine has a different operating system

B.The PaaS provider updated the runtime environment, breaking compatibility

C.The application's database connection string is incorrect

D.The cloud provider's physical server has a hardware fault

AnswerB

PaaS providers are responsible for managing and maintaining the runtime environment, which includes programming language versions, libraries, and middleware. An unannounced or mandatory update to this environment by the provider, such as upgrading from Python 3.8 to 3.9 or updating a critical dependency, can introduce breaking changes. If the deployed application's code is not compatible with the new runtime version or its updated dependencies, it will fail to start or function correctly, even without any changes to the application code itself.

Why this answer

In PaaS, the provider manages the runtime environment, including dependencies and configuration. An update may have changed the underlying platform (e.g., runtime version, library) that the application relies on, causing incompatibility. The developer's code is fine, so the issue is environmental.

Full explanation →

242

MCQhard

A user reports that their external monitor connected via USB-C (DisplayPort Alt Mode) works intermittently. When it does work, the resolution is limited to 1920x1080 even though the monitor supports 4K. The laptop supports USB-C with DisplayPort Alt Mode. What is the most likely cause?

A.The laptop's USB-C port is damaged.

B.The monitor's USB-C input is set to a lower resolution in its OSD.

C.The USB-C cable is not rated for video or high-speed data.

D.The graphics driver needs to be updated to support 4K over USB-C.

AnswerC

Many generic USB-C cables are designed primarily for charging or USB 2.0 data transfer, lacking the necessary internal wiring and shielding for high-bandwidth video signals like 4K via DisplayPort Alternate Mode. When such a cable is used for 4K video, it either defaults to a lower resolution it can handle, such as 1080p, or experiences signal degradation and intermittent dropouts due to insufficient bandwidth or signal integrity. This precisely matches the user's reported symptoms of intermittent 1080p operation.

Why this answer

The most likely cause is that the USB-C cable is not rated for video or high-speed data. USB-C cables vary in capabilities; some only support USB 2.0 data and charging, lacking the necessary wires for DisplayPort Alt Mode or high-bandwidth video, which results in intermittent connectivity and limited resolution.

Exam trap

The trap here is assuming that any USB-C cable can carry video, when in fact many cables are charge-only or low-speed, causing intermittent display and resolution limitations.

How to eliminate wrong answers

Option A is wrong because a damaged port would likely cause complete failure, not intermittent functionality with reduced resolution. Option B is wrong because the monitor's OSD resolution setting would typically affect all inputs consistently, and the user reports intermittent issues, suggesting a cable problem. Option D is wrong because graphics drivers are generally capable of 4K over USB-C if the hardware supports it; driver issues would more likely cause no display or errors, not intermittent resolution limits.

Full explanation →

243

MCQeasy

A technician is installing a new M.2 NVMe SSD in a desktop computer. After installation, the drive is not listed in the operating system's disk management tool, but it appears in the UEFI firmware interface. What should the technician do first?

A.Update the UEFI firmware to the latest version.

B.Initialize the disk in Disk Management and create a volume.

C.Change the SATA mode from AHCI to IDE in UEFI.

D.Reseat the M.2 drive in the slot.

AnswerB

For a newly installed M.2 NVMe SSD to be accessible by the operating system, it must first be initialized in Disk Management. This process involves selecting a partition style, either Master Boot Record (MBR) or GUID Partition Table (GPT), which prepares the disk for partitioning. Following initialization, a new volume (partition) must be created and formatted with a file system like NTFS, allowing the OS to store data on it.

Why this answer

When a drive is recognized in UEFI but not in the OS, it often means the drive is not initialized or formatted. Disk Management can initialize the drive and assign a file system, making it usable by the OS.

Full explanation →

244

MCQeasy

A user reports that their computer emits a loud, high-pitched whine when under load, but is silent at idle. The system is stable. What is the most likely cause?

A.The power supply fan bearing is failing, causing noise only when spinning faster.

B.The CPU cooler fan is unbalanced and vibrating against the case.

C.The power supply or GPU is experiencing coil whine due to electrical resonance.

D.The hard drive is making noise as it reads data during gaming.

AnswerC

Coil whine is an audible high-pitched sound originating from inductors, such as those found in power supplies or graphics cards, when their coils vibrate at resonant frequencies due to varying electrical currents. This phenomenon, often more noticeable under high load or specific frame rates, is a result of magnetostriction or piezoelectric effects and is generally considered a normal, albeit sometimes annoying, characteristic rather than a sign of impending failure.

Why this answer

Coil whine is a high-pitched noise caused by electrical resonance in inductors or capacitors, typically from the power supply or GPU, and it occurs only under load when current draw increases. The system remaining stable and the noise being load-dependent are classic indicators of coil whine rather than a failing fan or hard drive.

Exam trap

The trap here is confusing a load-dependent high-pitched electrical noise with a mechanical fan failure, since both occur under load but only coil whine is stable and purely tonal.

How to eliminate wrong answers

Option A is wrong because a failing power supply fan bearing usually produces a grinding or rumbling noise that may persist or worsen over time, not a pure high-pitched whine tied strictly to load. Option B is wrong because an unbalanced CPU cooler fan causes vibration and a lower-frequency buzzing or rattling, not a high-pitched electrical whine. Option D is wrong because hard drive read noise is a clicking or chattering sound, and modern SSDs are silent, so it would not match a high-pitched whine under load.

Full explanation →

245

MCQmedium

A technician is configuring a new Android tablet for a warehouse employee. The employee will use the tablet to scan barcodes and access a web-based inventory system. The tablet needs to stay connected to the Wi-Fi network even when the screen is off to receive updates. Which setting should the technician configure?

A.Set the screen timeout to 30 minutes

B.Enable 'Keep Wi-Fi on during sleep' and set it to 'Always'

C.Disable Bluetooth

D.Install a third-party app to keep the screen on

AnswerB

This setting directly configures the Android operating system to prevent the Wi-Fi radio from entering a low-power state or disconnecting when the device's screen turns off and it enters sleep mode. By selecting 'Always', the Wi-Fi module maintains a continuous connection to the access point, ensuring background data synchronization and notifications are received without interruption. This is the precise system-level control needed for persistent Wi-Fi connectivity.

Why this answer

The 'Keep Wi-Fi on during sleep' setting, when set to 'Always', ensures the tablet maintains its Wi-Fi connection even when the screen is off, allowing it to receive updates and stay connected. This directly addresses the requirement.

Exam trap

The trap is thinking that screen timeout or third-party apps are needed to keep Wi-Fi alive; the exam tests knowledge of the specific Android Wi-Fi sleep policy setting.

How to eliminate wrong answers

Option A is wrong because screen timeout only controls how long the screen stays on; it does not affect Wi-Fi connectivity during sleep. Option C is wrong because disabling Bluetooth is unrelated to Wi-Fi staying on during sleep. Option D is wrong because a third-party app to keep the screen on would drain battery and is not the correct setting for maintaining Wi-Fi during sleep.

Full explanation →

246

MCQmedium

A user's laptop frequently disconnects from a 5 GHz Wi-Fi network when they move to a room two walls away from the access point. The 2.4 GHz network remains stable throughout the office. Which of the following best explains this behavior?

A.The 5 GHz network is overloaded with users.

B.The laptop's Wi-Fi adapter is faulty.

C.The 5 GHz signal has weaker penetration through walls.

D.The access point is configured to prioritize 2.4 GHz traffic.

AnswerC

Higher frequency radio waves, such as those used by 5 GHz Wi-Fi, exhibit greater attenuation and less effective penetration through common building materials like walls, floors, and dense furniture compared to lower frequency 2.4 GHz signals. This increased signal degradation significantly reduces the effective range and signal strength of the 5 GHz network. Consequently, as the laptop moves further from the access point or into areas with more physical obstructions, the weaker signal can easily drop below a usable threshold, leading to frequent disconnections.

Why this answer

The 5 GHz band uses higher frequency radio waves that attenuate more rapidly when passing through solid obstacles like walls, resulting in weaker signal penetration compared to the 2.4 GHz band. This physical property causes the laptop to disconnect from the 5 GHz network when moving two walls away, while the 2.4 GHz signal remains stable due to its longer wavelength and better ability to diffract around obstacles.

Exam trap

The CompTIA A+ exam often tests the misconception that 5 GHz is 'better' in all scenarios, trapping candidates who overlook the fundamental physics of signal propagation and attenuation at higher frequencies.

How to eliminate wrong answers

Option A is wrong because network congestion (overloaded users) would cause throughput degradation or latency, not a disconnect triggered specifically by moving through walls; the 5 GHz band actually offers more non-overlapping channels and typically handles congestion better than 2.4 GHz. Option B is wrong because a faulty Wi-Fi adapter would cause disconnections on both bands, not selectively on 5 GHz only, and the 2.4 GHz network remains stable, ruling out a hardware defect. Option D is wrong because access point traffic prioritization affects bandwidth allocation and QoS, not the physical ability of the signal to penetrate walls; prioritization settings do not cause a client to disconnect when moving to a different room.

Full explanation →

247

MCQmedium

A technician is troubleshooting a network issue where a user's computer can access local resources but cannot reach the internet. The user's cable is connected to a wall jack that leads to a patch panel in the server room. The technician tests the cable and finds it is wired as a crossover cable. What is the most likely impact?

A.The crossover cable will prevent any network connectivity.

B.The crossover cable will cause intermittent connectivity.

C.The crossover cable is not the cause of the internet issue.

D.The crossover cable will only work at 100 Mbps.

AnswerC

Given that the user has local network access, it indicates that the physical layer connection established by the crossover cable is functional and allowing communication within the local network segment. If the crossover cable were causing a problem, local resources would also be inaccessible. Therefore, the issue preventing internet access must lie beyond the local network segment, such as with the router's internet connection, DNS resolution, or external firewall configurations.

Why this answer

Modern Ethernet interfaces support Auto-MDI/MDIX, which automatically detects and compensates for straight-through versus crossover wiring. Therefore, a crossover cable between a PC and a wall jack (which connects to a switch) will not prevent internet access; the switch port will auto-configure the transmit and receive pairs. Since the user can already access local resources, the physical link is working, so the crossover cable is not the cause of the internet issue.

Exam trap

The trap here is assuming that a crossover cable always breaks connectivity, ignoring Auto-MDI/MDIX and the fact that local access already proves the link is functional.

How to eliminate wrong answers

Option A is wrong because Auto-MDI/MDIX makes crossover cables functionally transparent on most modern equipment, so they do not prevent connectivity. Option B is wrong because a crossover cable either works or doesn't based on auto-detection; it does not inherently cause intermittent connectivity. Option D is wrong because crossover cables can support Gigabit and higher speeds when auto-detection is in play; the 100 Mbps limitation is a misconception based on older Fast Ethernet standards.

Full explanation →

248

MCQmedium

A client in a dense urban apartment building wants internet service but cannot install a satellite dish due to HOA rules. They have a phone line but no cable TV outlet. Which connection type is most practical and cost-effective?

A.Cable broadband

B.DSL

C.Satellite

D.Fiber-optic

AnswerB

Digital Subscriber Line (DSL) technology delivers internet access over standard copper telephone lines, leveraging higher frequencies than those used for voice calls. This means it can operate simultaneously with traditional phone service without requiring new wiring, provided a phone jack is present. In dense urban apartment buildings, existing telephone infrastructure is almost universally available, making DSL a readily accessible and cost-effective option for internet connectivity.

Why this answer

DSL (Digital Subscriber Line) uses existing telephone lines to provide internet access, making it the most practical and cost-effective option when cable TV outlets are unavailable and satellite dishes are prohibited. DSL is widely available in urban areas and does not require new cabling.

Exam trap

220-1201 often tests connection types based on availability and constraints; candidates might overlook the lack of cable outlet and HOA restriction, incorrectly choosing cable or satellite.

How to eliminate wrong answers

Option A is wrong because cable broadband requires a cable TV outlet, which the client does not have. Option C is wrong because satellite is prohibited by HOA rules. Option D is wrong because fiber-optic is not universally available and may require installation of new fiber lines, which can be expensive and time-consuming.

Full explanation →

249

MCQmedium

A user reports that their desktop PC powers on, but the monitor displays 'No Signal' and remains black. The PC's fans spin, and the power LED is solid. After reseating the video card and trying a different monitor cable, the issue persists. What is the MOST likely cause?

A.The power supply is failing to provide sufficient wattage to the GPU.

B.The CMOS battery is dead and the BIOS has reset.

C.The monitor's input source is set to the wrong port.

D.The motherboard's PCIe slot or the GPU itself is faulty.

AnswerD

After reseating the GPU and trying a new cable, the persistent 'No Signal' suggests the GPU or the PCIe slot is not functioning. The system powers on, so the issue is likely with the video output path. A faulty slot or GPU would prevent any display output, matching the symptoms. Testing the GPU in another slot or system would confirm.

Why this answer

The system powers on but shows no display after reseating the GPU and swapping cables, pointing to a faulty GPU or PCIe slot. A power issue would likely cause shutdowns or no power, while a monitor input error would have been addressed by cable changes. A CMOS battery problem would not block video entirely.

Thus, the most likely cause is a hardware failure in the video card or slot.

Exam trap

The trap here is assuming that a running system with no display must have a power or monitor issue, overlooking that the GPU or PCIe slot can fail while other components still receive power.

Full explanation →

250

MCQeasy

A user reports that they cannot access any websites, but they can ping the IP address of a public DNS server (8.8.8.8). What is the most likely misconfigured network service?

A.DHCP

B.DNS

C.NAT

D.Proxy

AnswerB

DNS (Domain Name System) is a critical service responsible for translating human-readable domain names, such as 'google.com', into numerical IP addresses that computers use to locate resources on the internet. If DNS resolution fails, web browsers cannot determine the correct IP address for a website, leading to errors like 'cannot access any websites,' even if the underlying network connection is functional and direct IP-based pings succeed. This symptom precisely matches a DNS failure.

Why this answer

The user can ping 8.8.8.8, confirming that IP connectivity and routing are working, but cannot access websites by name. This indicates that the system cannot resolve domain names to IP addresses, which is the function of DNS. A misconfigured DNS server address (e.g., pointing to a non-existent or unreachable DNS server) would cause this exact symptom.

Exam trap

The 220-1201 exam often tests the distinction between IP connectivity (Layer 3) and name resolution (Application Layer), tricking candidates into thinking a DHCP or NAT issue is at fault when the ping test clearly rules out those layers.

How to eliminate wrong answers

Option A is wrong because DHCP is responsible for assigning IP addresses, subnet masks, default gateways, and DNS server addresses; if DHCP were misconfigured, the user would likely have no IP address or a wrong gateway, making even pings fail. Option C is wrong because NAT translates private IP addresses to public ones for internet access; since the user can ping an external IP, NAT is functioning correctly. Option D is wrong because a proxy server sits between the client and the internet, intercepting web requests; if a proxy were misconfigured, the user might still be able to ping external IPs directly (bypassing the proxy), but web browsers would fail due to proxy settings, not DNS resolution.

Full explanation →

251

MCQmedium

A customer complains that their VoIP phone intermittently drops calls and has poor audio quality. The phone is connected to a switch port that also carries data traffic for a nearby workstation. What is the most likely cause?

A.The switch port is set to half-duplex.

B.The network cable is too long.

C.Quality of Service (QoS) is not configured on the switch port.

D.The phone’s firmware is outdated.

AnswerC

VoIP traffic is highly sensitive to latency, jitter, and packet loss due to its real-time nature. Without Quality of Service (QoS) configured on the switch port, the network treats all data traffic equally. This means that general data transfers or other network activities can easily consume available bandwidth, causing time-sensitive VoIP packets to be delayed, reordered, or dropped, leading directly to intermittent call quality degradation and dropped calls as network load fluctuates.

Why this answer

QoS is the most likely cause because VoIP traffic is highly sensitive to latency, jitter, and packet loss, and when voice and data share a switch port without QoS, data bursts can delay or drop voice packets. Configuring QoS (e.g., LLQ or priority queuing) ensures voice RTP packets are marked EF (DSCP 46) and serviced ahead of best-effort data. This directly addresses the intermittent call drops and poor audio quality described.

Exam trap

220-1201 often tests whether candidates confuse physical-layer causes (cable, duplex) with logical traffic-management causes (QoS), when the scenario explicitly mentions shared voice/data traffic.

How to eliminate wrong answers

Option A is wrong because a half-duplex port would cause collisions and severe performance degradation for all traffic, not just intermittent VoIP issues, and modern switches auto-negotiate full duplex. Option B is wrong because cable length beyond 100m would cause a complete link failure or constant errors, not intermittent call quality issues on a working port. Option D is wrong because outdated firmware might cause feature bugs, but the symptom pattern (intermittent drops when data traffic is present) points to contention, not firmware.

Full explanation →

252

MCQeasy

A user complains that their computer shuts down unexpectedly after a few minutes of gaming. You check the CPU temperature and find it is 105°C. What is the most likely cause?

A.Insufficient RAM

B.Failing power supply

C.Degraded thermal paste

D.Outdated BIOS

AnswerC

Degraded thermal paste significantly reduces the efficiency of heat transfer from the CPU's integrated heat spreader (IHS) to the CPU cooler's cold plate. Over time, thermal paste can dry out, crack, or pump out, creating air gaps that act as insulators. This poor thermal conductivity causes the CPU to rapidly accumulate heat under load, leading to dangerously high temperatures (e.g., 105°C) that trigger the CPU's thermal throttling and emergency shutdown mechanisms to prevent permanent damage.

Why this answer

A CPU temperature of 105°C is far beyond safe operating limits (typically 90-100°C max for modern CPUs), indicating a critical cooling failure. Degraded thermal paste loses its ability to transfer heat from the CPU to the heatsink, causing rapid overheating under load. The system shuts down to prevent permanent hardware damage, a protective mechanism triggered by the CPU's thermal sensor.

This aligns perfectly with the symptom of shutdowns after a few minutes of gaming, which is a sustained high-load scenario.

Exam trap

The trap here is that candidates might focus on the power supply or BIOS because those are common causes of unexpected shutdowns, but the key clue is the measured CPU temperature of 105°C, which directly points to a cooling issue.

How to eliminate wrong answers

Option A is wrong because insufficient RAM would cause performance issues like stuttering or application crashes, not a thermal shutdown; RAM does not generate significant heat. Option B is wrong because a failing power supply typically causes random reboots, freezes, or failure to power on, not a shutdown specifically after a few minutes of gaming with a measured CPU temperature of 105°C. Option D is wrong because an outdated BIOS might cause compatibility issues or instability, but it would not directly cause the CPU to reach 105°C; BIOS updates do not fix physical cooling problems.

Full explanation →

253

MCQmedium

A user receives an error when trying to access a cloud application: 'This application is not available in your region.' The user is traveling abroad. Which cloud concept is most likely causing this restriction?

A.High availability

B.Geolocation

C.Multi-tenancy

D.Resource pooling

AnswerB

Geolocation is the process of determining the real-world geographical position of an object, such as an internet-connected device, typically using its IP address, GPS coordinates, or Wi-Fi triangulation. This technology is precisely what allows systems to identify a user's physical region and subsequently apply specific access policies or content restrictions based on that determined location. Therefore, an error related to region-based access directly points to a geolocation service enforcing a policy.

Why this answer

Geolocation is the cloud concept that restricts access to applications or services based on the user's physical location, often determined by IP address. When a user travels abroad, their IP address changes to one associated with the foreign region, triggering the application's geolocation-based access controls. This is a common mechanism for complying with licensing agreements, data sovereignty laws, or regional content distribution rights.

Thus, the error message directly indicates a geolocation restriction.

Exam trap

The trap here is confusing geolocation with other cloud concepts like high availability or multi-tenancy, as candidates might overlook the explicit location-based error message and instead focus on general cloud characteristics.

How to eliminate wrong answers

Option A is wrong because high availability refers to ensuring that a system remains operational and accessible for a high percentage of time, typically through redundancy and failover mechanisms, not restricting access based on location. Option C is wrong because multi-tenancy is an architecture where a single instance of software serves multiple tenants (customers), isolating their data, but it does not inherently restrict access by region. Option D is wrong because resource pooling is the consolidation of computing resources to serve multiple consumers, often in a virtualized environment, and does not cause region-based access errors.

Full explanation →

254

MCQmedium

During a repair, you accidentally dislodged a small ribbon cable connecting the volume button flex to the mainboard of a smartphone. Now the volume buttons don't work. What is the most likely result of this mistake?

A.The phone won't power on.

B.The touchscreen becomes unresponsive.

C.The volume buttons become unresponsive.

D.The speaker stops producing sound.

AnswerC

Dislodging the small ribbon cable, which is specifically the volume button flex cable, directly severs the electrical connection between the physical volume buttons and the device's logic board. This interruption prevents the electrical signals generated by pressing the buttons from reaching the system. Consequently, the operating system cannot register these inputs, rendering the volume controls completely unresponsive.

Why this answer

The volume button flex cable directly connects the physical volume buttons to the mainboard. Dislodging this cable interrupts the electrical circuit that carries the button press signal, so the buttons become unresponsive. This is a direct physical disconnection, not a software or power issue.

Exam trap

The 220-1201 exam often tests the misconception that a single ribbon cable controls multiple unrelated functions, leading candidates to incorrectly assume a dislodged volume button cable would affect the speaker or power-on sequence.

How to eliminate wrong answers

Option A is wrong because the volume button flex cable is not part of the power-on circuit; the power button has its own separate flex cable or is integrated into the mainboard. Option B is wrong because the touchscreen uses a separate digitizer cable that connects to the mainboard, not the volume button flex. Option D is wrong because the speaker is driven by an audio amplifier and connected via a separate flex cable or solder points; the volume button flex only carries button input signals.

Full explanation →

255

MCQmedium

A technician is troubleshooting a user's computer that cannot access a web server at 10.10.10.50. The user's IP is 10.10.20.15 with subnet mask 255.255.0.0. The technician can ping 10.10.10.50 from the user's computer. What should the technician check next?

A.The default gateway setting on the user's computer.

B.The web server's firewall settings.

C.The user's IP address for a conflict.

D.The subnet mask on the user's computer.

AnswerB

The ability to successfully ping the web server indicates that fundamental network connectivity and IP routing are established at the network layer. However, ping (ICMP) operates on a different protocol and port than HTTP (TCP port 80 or 443). A firewall on the web server is frequently configured to permit ICMP echo requests for diagnostic purposes while explicitly blocking incoming HTTP/HTTPS traffic, either for security or if the web service is not intended to be publicly accessible. This scenario precisely explains why ICMP works but web browsing fails.

Why this answer

Since the technician can successfully ping the web server (10.10.10.50) from the user's computer, Layer 3 connectivity is verified. This rules out issues with the user's IP configuration, subnet mask, and default gateway. The problem is therefore specific to the web server's firewall blocking HTTP/HTTPS traffic (port 80/443) while allowing ICMP (ping).

Checking the web server's firewall settings is the logical next step.

Exam trap

This question tests the distinction between Layer 3 reachability (ping) and Layer 4/7 application access (HTTP). It is common to assume a client-side issue when the server's firewall is actually blocking the specific traffic.

How to eliminate wrong answers

Option A is wrong because a successful ping to a remote host confirms that the default gateway is correctly routing traffic; if the gateway were misconfigured, the ping would fail. Option C is wrong because an IP conflict would cause intermittent connectivity or complete network failure, but a successful ping proves the user's IP is unique and reachable. Option D is wrong because the subnet mask 255.255.0.0 is correct for the 10.10.0.0/16 network, and a mask mismatch would prevent ping from working at all.

Full explanation →

256

MCQmedium

A technician is configuring a small branch office network with 30 devices. The network uses a single router with DHCP enabled. To conserve IP addresses, the technician decides to use a subnet that provides exactly enough usable addresses for the devices, with minimal waste. Which subnet mask should the technician choose?

A.255.255.255.0

B.255.255.255.224

C.255.255.255.240

D.255.255.255.192

AnswerD

A /26 provides 62 usable hosts, still leaving 32 addresses unused beyond the 30 devices, so it does not achieve minimal waste. It is tempting because /26 is a common choice for small subnets, and it would be correct if roughly 60 devices needed addresses.

Why this answer

The branch office has 30 devices, but the router interface on that subnet also requires an IP address, so at least 31 usable host addresses are needed. A /27 subnet (255.255.255.224) provides only 30 usable addresses (2^5 - 2 = 30), which is not enough once the gateway is counted. A /26 subnet (255.255.255.192) provides 62 usable addresses (2^6 - 2 = 62), which accommodates the 30 devices plus the router with the least waste among the viable options.

Therefore, 255.255.255.192 is the correct choice.

Exam trap

CompTIA A+ subnetting questions often require you to remember that the router/gateway interface consumes a usable host address on the subnet. Candidates frequently pick the mask that yields exactly the number of usable addresses equal to the device count (e.g., /27 for 30 devices) and forget to reserve an address for the gateway, or they ignore the 'minimal waste' constraint and choose an unnecessarily large subnet.

How to eliminate wrong answers

Option A (255.255.255.0) is wrong because it provides 254 usable addresses (2^8 - 2), which is far more than the 30 needed, resulting in significant waste. Option C (255.255.255.240) is wrong because it provides only 14 usable addresses (2^4 - 2), which is insufficient for 30 devices. Option D (255.255.255.192) is wrong because it provides 62 usable addresses (2^6 - 2), which is more than required but not the minimal waste option; the /27 mask is a better fit.

Full explanation →

257

MCQhard

A large corporation needs to connect its headquarters in New York to a regional office in Los Angeles, as well as to a data center in Chicago, using dedicated leased lines. The network must support high bandwidth for video conferencing and data transfers. Which network topology best describes this setup?

A.Local Area Network (LAN)

B.Metropolitan Area Network (MAN)

C.Wide Area Network (WAN)

D.Personal Area Network (PAN)

AnswerC

A Wide Area Network (WAN) is specifically engineered to interconnect multiple geographically dispersed locations, spanning vast distances across states, countries, or even continents. It achieves this by utilizing public telecommunication infrastructure, such as leased lines, MPLS, or the internet, provided by carriers. This makes a WAN the ideal solution for a large corporation needing to link its headquarters situated in different major cities like New York, Los Angeles, and Chicago, enabling seamless communication and resource sharing.

Why this answer

A Wide Area Network (WAN) is the correct topology because it connects geographically dispersed locations—New York, Los Angeles, and Chicago—over a large geographical area using dedicated leased lines (e.g., T1/E1, T3, or MPLS circuits). WANs are specifically designed to provide high-bandwidth, reliable connectivity for applications like video conferencing and data transfers across cities or countries, which matches the requirement for dedicated leased lines spanning multiple states.

Exam trap

The trap here is that candidates confuse a MAN with a WAN because both cover multiple locations, but a MAN is limited to a single metropolitan area (e.g., connecting buildings in Los Angeles), whereas the question explicitly involves three cities across the U.S., which requires a WAN.

How to eliminate wrong answers

Option A is wrong because a Local Area Network (LAN) covers a small physical area like a single building or campus, not inter-city connections, and uses technologies like Ethernet and Wi-Fi rather than dedicated leased lines. Option B is wrong because a Metropolitan Area Network (MAN) typically spans a single city or metropolitan region (e.g., within New York or Los Angeles), not multiple cities across the country, and would not use dedicated leased lines for cross-country links. Option D is wrong because a Personal Area Network (PAN) covers a very short range (e.g., Bluetooth or USB connections around a single person) and cannot support high-bandwidth video conferencing or data transfers over hundreds of miles.

Full explanation →

258

MCQmedium

A user reports that their PC sometimes fails to boot, and when it does, they see a message saying 'Memory Management Error.' They have two 4 GB sticks of DDR3 RAM installed. A technician runs Windows Memory Diagnostic and finds errors on one stick. What should the technician do next?

A.Run a full system restore to fix the memory management error.

B.Update the motherboard BIOS to improve memory compatibility.

C.Replace the faulty RAM stick with a new one of the same specifications.

D.Remove both sticks and clean the contacts with a pencil eraser.

AnswerC

When diagnostic tools confirm a specific RAM module is faulty, the most direct and effective solution is to replace the defective hardware. Installing a new RAM stick with identical specifications (e.g., DDR generation, speed, capacity, and voltage) ensures system stability and optimal performance, as it directly addresses the identified hardware failure rather than attempting to mitigate symptoms.

Why this answer

Windows Memory Diagnostic has already identified errors on one specific RAM stick, so the correct next step is to replace that faulty stick with a new one of matching specifications (DDR3, same speed, ideally same capacity). RAM errors are physical hardware failures and cannot be resolved by software restores or BIOS updates. Cleaning contacts might help with intermittent detection issues, but the diagnostic has already confirmed the module is faulty.

Exam trap

220-1201 often tests whether candidates jump to software fixes (system restore, BIOS update) for hardware-confirmed failures; the trap is ignoring that Windows Memory Diagnostic already isolated the faulty module, making replacement the only logical next step.

How to eliminate wrong answers

Option A is wrong because a system restore reverts software/driver changes and cannot repair physically failing RAM — the 'Memory Management' BSOD is a symptom, not a software corruption. Option B is wrong because a BIOS update can improve compatibility or stability in some cases, but it cannot fix a module that Windows Memory Diagnostic has already flagged as producing errors. Option D is wrong because cleaning contacts with a pencil eraser addresses poor seating/oxidation (which causes detection failures), not the confirmed error-producing module; also, eraser residue can damage contacts, and the diagnostic already isolated the fault.

Full explanation →

259

MCQmedium

A user is trying to connect their smartphone to a car's infotainment system using Bluetooth for hands-free calling. The phone pairs successfully, but audio only plays through the phone's speaker, not the car's speakers. Which of the following is the most likely reason for this issue?

A.The car's Bluetooth system does not support the phone's Bluetooth version.

B.The phone is only connected for phone calls (HFP) and not for media audio (A2DP).

C.The car's speakers are defective.

D.The phone's audio output is set to 'Speaker' in the call app.

AnswerD

The 'Speaker' setting within a phone's call application is a temporary, per-call toggle that directs the current call's audio to the phone's internal speaker instead of a connected Bluetooth device. This specific setting does not influence the persistent Bluetooth profile configuration for media audio (A2DP) or prevent future calls from routing through Bluetooth if HFP is active. It is a transient setting for a specific call, not a global media output control affecting all audio types.

Why this answer

Even if a smartphone is successfully paired and connected to a car's infotainment system via Bluetooth (including the Hands-Free Profile for calls), the phone's audio output for calls might still be directed to its internal speaker. This often requires a manual selection within the phone's call interface or settings to route the audio to the connected Bluetooth device. Option D directly addresses this common user configuration issue, which is a more likely cause than a profile mismatch if the primary concern is call audio not routing to the car.

Exam trap

The 220-1201 exam often tests common user configuration issues and basic troubleshooting steps, leading candidates to incorrectly blame hardware or complex profile mismatches instead of recognizing simple output selection errors.

How to eliminate wrong answers

Option A is wrong because Bluetooth is backward compatible; a phone with a newer version (e.g., 5.x) can still connect to an older car system (e.g., 4.0) using the supported profiles, and version mismatch does not cause selective audio routing failure. Option C is wrong because the car's speakers are not defective; the phone pairs and calls work (just through the phone speaker), and a speaker defect would affect all audio or cause no sound at all. Option D is wrong because the phone's call app 'Speaker' setting only toggles the phone's internal speaker during a call, not the Bluetooth audio routing; if the phone were connected for media audio (A2DP), the car speakers would still be used regardless of that setting.

Full explanation →

260

MCQeasy

A user reports that they cannot access the internet, but they can ping other devices on the local network. The technician checks the IP configuration and sees: IP: 192.168.1.25, Subnet Mask: 255.255.255.0, Default Gateway: 192.168.2.1. What is the issue?

A.The subnet mask is incorrect.

B.The default gateway is on a different subnet.

C.The IP address is a broadcast address.

D.The DNS server is misconfigured.

AnswerB

A device determines if a destination IP address is on its local subnet by comparing the destination IP with its own IP and subnet mask. If the default gateway's IP address (192.168.2.1) falls outside the device's local subnet (192.168.1.0/24), the device will attempt to send traffic to a gateway it cannot directly reach. This fundamental routing misconfiguration prevents the device from forwarding any packets outside its local network segment, thus blocking internet access.

Why this answer

The default gateway 192.168.2.1 is not on the same subnet as the host IP 192.168.1.25 with subnet mask 255.255.255.0. For a /24 network, the host's subnet is 192.168.1.0/24, while the gateway belongs to 192.168.2.0/24. The host will ARP for the gateway but never receive a reply because the gateway is on a different Layer 2 broadcast domain, making internet access impossible despite local connectivity.

Exam trap

The 220-1201 exam often tests the concept that a host can only communicate directly with devices on its own subnet; the trap here is that candidates see a valid IP and gateway and assume the issue is DNS or the subnet mask, overlooking the subnet mismatch between the host and gateway.

How to eliminate wrong answers

Option A is wrong because the subnet mask 255.255.255.0 is correct for a /24 network and does not cause the mismatch; the issue is the gateway's IP address, not the mask. Option C is wrong because 192.168.1.25 is a valid host address within the 192.168.1.0/24 range (broadcast address would be 192.168.1.255). Option D is wrong because DNS misconfiguration would prevent name resolution but not block all internet traffic; the user can't reach any external IP, indicating a routing/gateway problem, not DNS.

Full explanation →

261

MCQmedium

A user's Android phone is running slowly and frequently shows 'App not responding' messages. The user has not installed any new apps recently. What should a technician do first?

A.Perform a factory reset.

B.Check for available OS and app updates.

C.Uninstall all recently used apps.

D.Replace the phone's battery.

AnswerB

Checking for available operating system (OS) and application updates is the most appropriate first step. Software updates frequently include critical bug fixes, performance optimizations, and security patches that can directly address issues causing slowdowns, memory leaks, and application instability. These updates improve system efficiency, enhance compatibility, and resolve known issues that lead to apps crashing or becoming unresponsive, often without requiring data loss or extensive reconfiguration.

Why this answer

Checking for available OS and app updates is the least invasive and most likely first step when an Android phone runs slowly without new app installations. Outdated system software or apps can cause memory leaks, compatibility issues, and ANR (Application Not Responding) errors. Applying updates often resolves performance degradation without data loss or hardware intervention.

Exam trap

220-1201 often tests whether candidates jump to drastic solutions (factory reset, hardware replacement) instead of following the CompTIA troubleshooting methodology, which prioritizes the least invasive, most probable fix first.

How to eliminate wrong answers

Option A is wrong because a factory reset is a drastic last-resort step that erases all user data and should only be attempted after simpler troubleshooting fails. Option C is wrong because uninstalling all recently used apps is overly aggressive and unnecessary when the user has not installed new apps; it does not address the root cause and disrupts the user's workflow. Option D is wrong because replacing the battery addresses hardware degradation, but the symptoms (slow performance, ANR messages) point to software issues, not power delivery problems.

Full explanation →

262

MCQhard

A technician is replacing the display assembly on a laptop. After installing the new display, the laptop powers on but the screen remains black. The technician has verified the display cable is fully seated at both ends. What should the technician check next to diagnose the issue?

A.Replace the LCD panel again, assuming the new one is defective.

B.Check the backlight voltage or inverter board (if applicable).

C.Update the graphics driver from the Windows Recovery Environment.

D.Reseat the RAM modules to ensure proper boot.

AnswerB

The scenario describes a laptop that powers on but has a black screen after a display assembly replacement. This strongly indicates a backlight issue, as the LCD panel itself might be receiving video signals but lacks illumination. For older CCFL-backlit displays, the inverter board supplies high voltage to the CCFL tube; for modern LED-backlit displays, the backlight voltage is supplied directly from the system board or a dedicated backlight driver circuit. Verifying the voltage or inspecting the inverter/driver board is the logical next step to diagnose the lack of illumination.

Why this answer

A black screen with power but no display often indicates a backlight failure, not a complete display failure. The technician should check the backlight voltage or inverter board (if the display uses CCFL backlighting) to ensure the backlight is receiving power. Since the display cable is verified as seated, the next logical step is to isolate whether the issue is with the backlight circuit or the LCD panel itself.

Exam trap

The 220-1201 exam often tests the misconception that a black screen always means a dead LCD panel, leading candidates to immediately replace the panel instead of checking the backlight power supply or inverter board.

How to eliminate wrong answers

Option A is wrong because replacing the LCD panel again without first checking the backlight circuit is premature and wastes time; a defective panel is less likely than a backlight power issue, especially when the system powers on. Option C is wrong because updating the graphics driver from the Windows Recovery Environment would not resolve a hardware-level backlight failure; the screen remains black regardless of driver state if the backlight is not powered. Option D is wrong because reseating RAM modules addresses boot failures or POST issues, not a black screen with power; the laptop powers on, indicating RAM is likely functioning.

Full explanation →

263

MCQhard

A technician is asked to run a new network cable from a patch panel to a cubicle 80 meters away. The cable must support at least 1 Gbps. The technician has Cat6 cable on hand. What is the maximum distance this cable will support for 1 Gbps?

A.55 meters

B.100 meters

C.150 meters

D.200 meters

AnswerB

Cat6 supports 1 Gbps up to 100 meters, so 80 meters is within spec.

Why this answer

Cat6 cable is rated to support 1 Gbps Ethernet (1000BASE-T) up to a maximum distance of 100 meters per the TIA/EIA-568 standard. Since the required distance is 80 meters, which is within this limit, the cable will support 1 Gbps. The 100-meter limit includes the combined length of the horizontal cable from the patch panel to the cubicle, plus any patch cords at both ends.

Exam trap

In CompTIA A+ 220-1201, candidates often confuse the maximum distance for 1 Gbps (100 meters) with the distance for 10 Gbps over Cat6 (55 meters), mistakenly applying the shorter limit.

How to eliminate wrong answers

Option A is wrong because 55 meters is the maximum distance for Cat6 at 10 Gbps (10GBASE-T), not for 1 Gbps. Option C is wrong because 150 meters exceeds the 100-meter limit for any twisted-pair copper Ethernet standard (1000BASE-T, 100BASE-TX, etc.) without a repeater or switch. Option D is wrong because 200 meters is far beyond the 100-meter limit and would require fiber optic cabling or active signal regeneration.

Full explanation →

264

MCQeasy

A technician is deploying a new SSD in a desktop PC. After installing the drive and connecting the SATA data and power cables, the system does not recognize the drive in the BIOS. All other drives are detected. What should the technician check first?

A.Update the motherboard BIOS

B.Check if the drive needs to be initialized in Disk Management

C.Reseat the SATA data and power cables

D.Replace the SATA controller

AnswerC

Reseating the SATA data and power cables is the most effective and common first troubleshooting step for a new drive not being detected. Loose or improperly connected cables are a frequent cause of detection failures, as a secure physical connection is essential for both the drive to receive power and for the motherboard to establish communication. Ensuring these cables are firmly seated can often resolve the issue without further intervention.

Why this answer

When a new drive is not detected, the most common cause is a loose or improper connection. The technician should reseat both the SATA data cable at the drive and motherboard, and the power cable from the PSU. If that fails, testing the drive in another port or with another cable is the next step.

Full explanation →

265

MCQhard

A multinational corporation has offices in New York, London, and Tokyo. They need a private, dedicated network to connect all offices with high reliability and low latency. Which network type should be implemented?

A.Local Area Network (LAN)

B.Metropolitan Area Network (MAN)

C.Wide Area Network (WAN)

D.Personal Area Network (PAN)

AnswerC

A Wide Area Network (WAN) is purpose-built to connect geographically distant networks, utilizing public or private telecommunications links, such as fiber optic cables, satellite links, or MPLS (Multiprotocol Label Switching). Its robust architecture allows for the secure and reliable transmission of data across vast distances, making it the appropriate solution for a multinational corporation needing to link offices in New York and London.

Why this answer

A Wide Area Network (WAN) is the correct choice because it is designed to connect geographically dispersed locations, such as offices in different cities or countries, over a large area. WANs provide private, dedicated circuits (e.g., MPLS, leased lines) that offer high reliability and low latency, meeting the multinational corporation's requirements for interconnecting New York, London, and Tokyo.

Exam trap

The trap here is that candidates often confuse a WAN with a MAN, mistakenly thinking a MAN can cover intercontinental distances, but a MAN is strictly limited to a metropolitan area (e.g., a city), not global connectivity.

How to eliminate wrong answers

Option A is wrong because a Local Area Network (LAN) is confined to a single building or campus and cannot span the thousands of kilometers between New York, London, and Tokyo. Option B is wrong because a Metropolitan Area Network (MAN) typically covers a city or metropolitan region (e.g., within a 50 km range) and is insufficient for intercontinental connectivity. Option D is wrong because a Personal Area Network (PAN) is limited to a very short range (e.g., Bluetooth, USB, typically under 10 meters) and is designed for personal devices, not enterprise-level office interconnections.

Full explanation →

266

MCQhard

A technician is troubleshooting a PC that fails to POST. The CPU fan spins, but there is no display output. The motherboard has a diagnostic LED that shows a CPU error. Which step should the technician take first to resolve the issue?

A.Replace the power supply

B.Update the BIOS using a USB flashback

C.Reseat the CPU

D.Replace the CPU

AnswerC

Reseating the CPU is often the first and most effective troubleshooting step when a diagnostic LED indicates a CPU error. This action can correct issues such as improper seating, bent pins (if applicable to the socket type), or poor electrical contact between the CPU and its socket. A slight misalignment or dust accumulation can prevent proper communication or power delivery to the CPU, triggering the error LED, and reseating often resolves these physical connection problems.

Why this answer

Reseating the CPU is the correct first step because a CPU error LED with a spinning fan but no POST often indicates poor CPU socket contact, which can result from a loose CPU, bent pins, or thermal paste issues. Reseating is non-destructive and addresses the most common cause before replacing hardware. Replacing the power supply or CPU is premature, and BIOS update is not possible without POST.

Exam trap

220-1201 often tests the principle of 'least invasive first' in troubleshooting, causing candidates to jump to replacing components instead of trying simple reseating.

How to eliminate wrong answers

Option A is wrong because the CPU fan spinning indicates the power supply is delivering power; a failed PSU would typically cause no fan activity or intermittent power. Option B is wrong because BIOS flashback requires the system to be in a functional state or specific USB flashback feature, and it does not address a CPU error LED. Option D is wrong because replacing the CPU is a last resort after reseating and testing; it is more expensive and time-consuming than reseating.

Full explanation →

267

MCQeasy

A customer wants to connect a Bluetooth keyboard and mouse to their tablet for a presentation. They ask which accessory is needed to ensure both devices work reliably from across the room. What should you recommend?

A.A USB-C hub with Bluetooth functionality to extend range.

B.A Bluetooth adapter plugged into the tablet's charging port.

C.A Bluetooth extender or repeater to boost signal strength.

D.A wireless dongle that connects both keyboard and mouse via a single receiver.

AnswerC

A Bluetooth extender or repeater is specifically designed to receive the existing Bluetooth signal from a source device and retransmit it with increased power, effectively expanding the operational range of Bluetooth devices. By strategically placing such a device, the signal strength can be boosted, allowing the Bluetooth keyboard and mouse to maintain a stable connection over greater distances, such as across a room, overcoming typical range limitations and potential interference.

Why this answer

Bluetooth range is typically limited to about 10 meters (33 feet) under ideal conditions, and obstacles like walls or furniture can reduce this further. A Bluetooth extender or repeater captures the signal from the tablet and retransmits it, effectively boosting the signal strength and extending the reliable operating distance across a room. This ensures both the keyboard and mouse maintain a stable connection without dropouts.

Exam trap

The trap here is that candidates often confuse adding Bluetooth functionality (via a hub or adapter) with extending range, but the exam tests the understanding that Bluetooth range is limited by radio power and that a repeater is specifically designed to overcome distance limitations.

How to eliminate wrong answers

Option A is wrong because a USB-C hub with Bluetooth functionality does not inherently extend range; it merely adds Bluetooth capability if the tablet lacks it, but the Bluetooth radio still operates at standard Class 2 power (about 2.5 mW) with a typical range of 10 meters. Option B is wrong because a Bluetooth adapter plugged into the tablet's charging port (e.g., a USB-C to Bluetooth dongle) provides Bluetooth connectivity but does not boost signal strength or extend range beyond the standard Class 2 limit. Option D is wrong because a wireless dongle that connects both keyboard and mouse via a single receiver typically uses a proprietary RF protocol (e.g., Logitech Unifying), not standard Bluetooth, and its range is also limited to about 10 meters; it does not extend range across a room.

Full explanation →

268

MCQmedium

A technician is setting up a new office with 20 workstations. The cabling is Cat6, and all runs are under 90 meters. After terminating the cables at the patch panel and wall jacks, the technician tests each run with a cable certifier. One run fails the test for near-end crosstalk (NEXT). What is the most likely cause?

A.The cable is too long for Cat6 specifications.

B.The cable is not properly shielded.

C.The cable pairs are untwisted too much at the termination point.

D.The cable is damaged from being pulled too hard during installation.

AnswerC

Excessive untwisting of the individual wire pairs at the termination point, such as within an RJ-45 connector or a punch-down block, severely compromises the cable's ability to cancel electromagnetic interference. The precise twisting of pairs along the cable length is fundamental to inducing opposing electromagnetic fields that cancel out crosstalk. When these twists are undone for more than about 0.5 inches (1.27 cm) at the termination, the cancellation effect is lost, allowing signals from adjacent pairs to couple and generate significant Near-End Crosstalk (NEXT) that exceeds acceptable limits.

Why this answer

This question tests understanding of cable termination quality and crosstalk. The correct answer is that the untwisting of pairs at the termination point is too long, which can cause NEXT failures.

Full explanation →

269

MCQmedium

A technician is setting up a mobile point-of-sale system for a small retail store. The tablet needs to be mounted on the counter and remain powered throughout the day. Which two accessories are essential for this deployment?

A.A rugged case and a Bluetooth keyboard.

B.A stand and a charging dock.

C.A screen protector and a stylus.

D.A portable battery pack and a car charger.

AnswerB

A stand is crucial for establishing a stable and ergonomic setup, allowing the tablet to be securely positioned for both staff and customer interaction during transactions. Concurrently, a dedicated charging dock ensures the tablet remains continuously powered throughout extended business hours, preventing unexpected battery depletion that would disrupt sales and customer service. This combination directly addresses the fundamental needs for operational stability and uninterrupted power supply, making it ideal for a reliable counter-based mobile POS system.

Why this answer

A stand securely mounts the tablet on the counter at an ergonomic viewing angle, while a charging dock provides continuous power to keep the tablet operational throughout the day without battery depletion. These two accessories directly address the deployment requirements of fixed mounting and uninterrupted power for a stationary point-of-sale system.

Exam trap

In the CompTIA A+ 220-1201 exam, candidates often confuse accessories that provide temporary power (like portable battery packs) with those that provide continuous, fixed power (like charging docks), leading them to overlook the 'remain powered throughout the day' requirement.

How to eliminate wrong answers

Option A is wrong because a rugged case offers drop protection but does not mount the tablet or provide power, and a Bluetooth keyboard is unnecessary for a touchscreen-based POS system. Option C is wrong because a screen protector guards against scratches but does not mount or power the tablet, and a stylus is not essential for typical POS touch interactions. Option D is wrong because a portable battery pack provides temporary power but requires manual recharging and does not mount the tablet, and a car charger is designed for vehicle use, not for a countertop deployment.

Full explanation →

270

MCQeasy

A customer reports that their internet connection drops frequently during rainstorms. They have a cable modem and a wireless router. What is the most likely cause of the intermittent connection?

A.The wireless router is overheating.

B.The cable modem's coaxial cable connection is compromised by moisture.

C.The DSL filter is malfunctioning.

D.The satellite dish is out of alignment.

AnswerB

Moisture ingress into a coaxial cable connection, particularly at outdoor splices or poorly sealed connectors, can significantly degrade the signal quality. Water acts as a conductor and can short the signal, increase impedance, or introduce noise, leading to intermittent signal loss and frequent internet drops, especially during rainstorms when water can penetrate compromised seals. This directly impacts the modem's ability to maintain a stable connection with the ISP.

Why this answer

Cable internet relies on a coaxial cable connection from the street to the modem. During rainstorms, moisture can seep into damaged or poorly sealed coaxial connectors or cable sheathing, causing signal attenuation or intermittent shorting that drops the connection. This is a classic symptom of RF signal degradation due to water ingress, which directly affects the physical layer (Layer 1) of the cable modem's link.

Exam trap

The CompTIA A+ exam often tests the distinction between cable modem (coaxial) and DSL (telephone line) technologies. The trap here is that candidates may confuse DSL filters with cable modem issues or incorrectly assume that rain only affects satellite or wireless signals, ignoring that coaxial cable is also vulnerable to moisture ingress.

How to eliminate wrong answers

Option A is wrong because wireless router overheating would cause intermittent Wi-Fi disconnections, not the entire internet connection dropping, and it would not be correlated specifically with rainstorms. Option C is wrong because DSL filters are used only on DSL (Digital Subscriber Line) connections to separate voice and data frequencies; cable modems do not use DSL filters, so a malfunctioning DSL filter is irrelevant to a cable internet setup. Option D is wrong because a satellite dish out of alignment would cause signal loss during heavy rain (rain fade) but the question specifies a cable modem and wireless router, not a satellite dish; satellite internet uses a dish, not a cable modem.

Full explanation →

271

MCQeasy

A technician is configuring a new SOHO router for a client who has a DSL internet connection. What type of cable will the technician use to connect the router to the wall jack?

A.Coaxial cable (RG-6)

B.Telephone cable (RJ-11)

C.Fiber optic cable

D.Ethernet cable (RJ-45)

AnswerB

Digital Subscriber Line (DSL) technology leverages the existing copper twisted-pair infrastructure of the public switched telephone network (PSTN) to provide internet access. A DSL modem or SOHO router with integrated DSL modem functionality connects to the telephone wall jack using a standard telephone cable terminated with an RJ-11 connector. This cable carries the modulated DSL signal, separating it from voice traffic via a splitter or microfilter, allowing simultaneous voice and data communication over the same line.

Why this answer

DSL (Digital Subscriber Line) transmits data over standard copper telephone lines using frequencies above the voice band. The wall jack for DSL is a standard RJ-11 phone jack, so the technician must use a telephone cable with RJ-11 connectors to connect the router's DSL port to the wall jack.

Exam trap

CompTIA A+ often tests the distinction between the WAN-side connection type (DSL requiring RJ-11) and the LAN-side connection type (Ethernet requiring RJ-45), causing candidates to mistakenly choose Ethernet cable because they think of the router's LAN ports.

How to eliminate wrong answers

Option A is wrong because coaxial cable (RG-6) is used for cable internet (DOCSIS) or satellite connections, not for DSL. Option C is wrong because fiber optic cable is used for fiber-to-the-home (FTTH) connections, which require an optical network terminal (ONT) and a different type of router port. Option D is wrong because Ethernet cable (RJ-45) is used to connect a router to a modem or LAN devices, not to a DSL wall jack; the DSL port on a SOHO router is an RJ-11 port.

Full explanation →

272

MCQmedium

A user’s laptop is connected to a Wi-Fi network with a strong signal, but the user cannot access any network resources. The IP configuration shows an address of 192.168.1.50 with a subnet mask of 255.255.255.0 and a default gateway of 192.168.1.1. The technician pings the gateway successfully. What should the technician check next?

A.Replace the Wi-Fi adapter.

B.Check the DNS server settings on the laptop.

C.Verify the SSID is correct.

D.Disable the firewall temporarily.

AnswerB

The successful ping to the gateway confirms Layer 3 network connectivity to the local router or access point. However, if web browsing or accessing resources by name fails, it strongly suggests a name resolution problem. Incorrect or misconfigured Domain Name System (DNS) server settings would prevent the laptop from translating human-readable domain names into the numerical IP addresses required for internet communication, thus blocking access despite local network functionality.

Why this answer

The laptop has a valid IP configuration and can ping the default gateway, indicating that local network connectivity is working. However, the user cannot access network resources, which suggests a problem with name resolution or routing beyond the local subnet. The next logical step is to check the DNS server settings, as incorrect DNS would prevent the laptop from resolving hostnames of network resources.

Exam trap

220-1201 often tests the misconception that any network issue requires hardware replacement or firewall changes, when in fact DNS is a common culprit after basic connectivity is confirmed.

How to eliminate wrong answers

Option A is wrong because replacing the Wi-Fi adapter is unnecessary since the laptop has a strong signal and can ping the gateway. Option C is wrong because verifying the SSID is correct is moot since the laptop is already connected and can communicate with the gateway. Option D is wrong because disabling the firewall temporarily is a security risk and unlikely to be the cause if the gateway is reachable; firewall issues would typically block all traffic, but ping to gateway works.

Full explanation →

273

MCQhard

A technician is configuring a network for a municipal government that needs to connect public Wi-Fi hotspots across a city, covering an area of about 50 square kilometers. The network must be secure and provide internet access to citizens. Which network type should be deployed?

A.Local Area Network (LAN)

B.Wide Area Network (WAN)

C.Metropolitan Area Network (MAN)

D.Personal Area Network (PAN)

AnswerC

A Metropolitan Area Network (MAN) is specifically designed to cover a geographic area the size of a city or a large campus, typically spanning tens of kilometers. It interconnects multiple LANs within an urban environment, providing high-speed connectivity suitable for municipal services, public Wi-Fi hotspots, and linking various government or educational institutions. The MAN offers an optimal balance of coverage, speed, and cost-effectiveness for urban-scale networking requirements.

Why this answer

A Metropolitan Area Network (MAN) is designed to cover a geographic area larger than a LAN but smaller than a WAN, typically spanning a city or a large campus. For a municipal government connecting public Wi-Fi hotspots across 50 square kilometers, a MAN provides the necessary range and can utilize technologies like Metro Ethernet or fiber-optic rings to deliver secure, high-speed internet access to citizens.

Exam trap

The trap here is that candidates often confuse a MAN with a WAN because both cover large areas, but a WAN is designed for inter-city or inter-country links, while a MAN is specifically optimized for a city-scale network, making it the correct choice for this scenario.

How to eliminate wrong answers

Option A is wrong because a Local Area Network (LAN) is confined to a small area such as a single building or office, typically up to a few hundred meters, and cannot cover 50 square kilometers. Option B is wrong because a Wide Area Network (WAN) spans large geographical areas like countries or continents, often using leased lines or satellite links, which is overkill and not optimized for city-wide municipal connectivity. Option D is wrong because a Personal Area Network (PAN) covers a very short range, usually within a few meters (e.g., Bluetooth or USB connections), and is unsuitable for city-wide Wi-Fi hotspots.

Full explanation →

274

MCQmedium

A technician is troubleshooting a PC that fails to boot and emits a series of long beeps. The motherboard documentation indicates this is a memory error. Which component on the motherboard is responsible for generating these beep codes?

A.CMOS battery

B.BIOS/UEFI chip

C.Chipset

D.Super I/O chip

AnswerB

The BIOS (Basic Input/Output System) or its modern successor, UEFI (Unified Extensible Firmware Interface), resides on a flash memory chip on the motherboard and is the primary firmware responsible for initiating the computer's boot process. Immediately upon power-on, the BIOS/UEFI executes the Power-On Self-Test (POST), which checks essential hardware components like the CPU, RAM, and video card. If a critical hardware fault is detected during POST, the BIOS/UEFI firmware generates specific audible beep codes through the internal speaker to signal the nature of the problem before any video output can be displayed.

Why this answer

The BIOS/UEFI firmware is responsible for the Power-On Self-Test (POST) and uses the speaker to emit beep codes to indicate hardware errors. The CMOS battery only retains settings, the chipset handles data flow, and the Super I/O manages I/O but not POST beep codes.

Full explanation →

275

MCQhard

A technician is troubleshooting a user's inability to reach a server at 172.16.50.100. The user's IP is 172.16.50.50 with subnet mask 255.255.255.0. The technician runs a traceroute and sees the first hop is the gateway (172.16.50.1), but the second hop times out. What does this indicate?

A.The user's IP address is in the wrong subnet.

B.The server is powered off.

C.There is a routing problem between the gateway and the server.

D.The user's default gateway is incorrect.

AnswerC

This option is correct because the traceroute output indicates that the user's machine can successfully reach its default gateway (the first hop). However, the traceroute then fails to proceed further, showing timeouts or 'request timed out' for subsequent hops. This behavior strongly suggests that the default gateway or a router further along the path lacks a proper route to the destination server, or there's an issue with an intermediate router's forwarding capabilities.

Why this answer

The traceroute shows that the first hop (the gateway at 172.16.50.1) responds, but the second hop times out. This indicates that the packet successfully leaves the user's subnet and reaches the gateway, but fails to be routed further towards the server. This points to a routing issue beyond the local gateway, such as a missing route on the gateway or an intermediate router dropping the packets.

Exam trap

The CompTIA A+ exam often tests the distinction between a local subnet issue (where the first hop fails) and a routing issue beyond the gateway (where the first hop succeeds but subsequent hops fail), leading candidates to incorrectly blame the user's IP configuration or the server's power state.

How to eliminate wrong answers

Option A is wrong because the user's IP (172.16.50.50) and subnet mask (255.255.255.0) place it in the 172.16.50.0/24 subnet, which matches the server's IP (172.16.50.100), so there is no subnet mismatch. Option B is wrong because if the server were powered off, the traceroute would show a timeout at the final hop (the server itself), not at the second hop; the second hop timeout indicates a routing problem before reaching the server. Option D is wrong because the user's default gateway is 172.16.50.1, which is the correct gateway for the 172.16.50.0/24 subnet, and the first hop response confirms the gateway is reachable and functioning.

Full explanation →

276

MCQeasy

A technician is configuring a new wireless router for a home office. The customer wants to ensure that guests can access the internet but cannot see other devices on the main network. Which feature should the technician enable on the router?

A.MAC address filtering

B.Port forwarding

C.Guest network

D.WPS (Wi-Fi Protected Setup)

AnswerC

Enabling a guest network on a wireless router establishes a separate logical network, typically implemented as a Virtual Local Area Network (VLAN), distinct from the primary private network. This configuration isolates guest devices from the main network, preventing them from accessing shared files, printers, or other devices connected to the primary LAN. Guest networks often include client isolation, which further prevents guest devices from communicating with each other, ensuring robust security and meeting the requirement for traffic isolation.

Why this answer

Enabling a guest network creates a separate SSID and VLAN (or subnet) that isolates guest traffic from the main LAN. This prevents guests from accessing local devices (e.g., printers, file shares) while still providing internet access through the router's NAT. The isolation is typically achieved via client isolation or AP isolation settings, ensuring Layer 2 separation between the guest and main networks.

Exam trap

The trap here is that candidates may confuse MAC address filtering (which restricts access) with network isolation, or think WPS provides security features beyond simple connection convenience.

How to eliminate wrong answers

Option A is wrong because MAC address filtering only controls which devices can connect based on their MAC addresses; it does not isolate guest traffic from the main network. Option B is wrong because port forwarding directs external traffic to a specific internal device and does not provide network segmentation or guest isolation. Option D is wrong because WPS is a simplified method for connecting devices to Wi-Fi using a PIN or push button; it offers no network isolation or guest access controls.

Full explanation →

277

MCQeasy

A small office uses a single public IP address for internet access. The network administrator wants internal web servers to be reachable from the internet on port 80. Which network service should be configured on the router to allow this?

A.DHCP

B.Port forwarding

C.DNS

D.VPN

AnswerB

Port forwarding, also known as Destination Network Address Translation (DNAT), is a technique used by routers to redirect communication requests from one address and port number combination to another while the packets are traversing a network gateway. In the context of a single public IP, it specifically allows external devices to initiate connections to a specific service running on a private IP address within the LAN by mapping an incoming public port to a designated internal IP address and its corresponding service port. This is the precise mechanism for exposing internal services to the internet when only one public IP is available.

Why this answer

Port forwarding (option B) is the correct answer because it allows the router to translate incoming traffic on a specific public IP address and port (e.g., TCP 80) to a specific internal private IP address and port of the web server. This is a form of Destination NAT (DNAT) that enables external hosts to reach internal services when only a single public IP is available.

Exam trap

The trap here is that candidates often confuse DNS with port forwarding, thinking that DNS can direct traffic to internal servers, but DNS only resolves names to IP addresses and cannot change the destination port or translate private addresses.

How to eliminate wrong answers

Option A (DHCP) is wrong because DHCP dynamically assigns IP addresses and other network configuration to clients, but it does not translate or forward incoming internet traffic to internal servers. Option C (DNS) is wrong because DNS resolves domain names to IP addresses; it does not redirect or forward traffic to internal hosts behind a NAT router. Option D (VPN) is wrong because a VPN creates an encrypted tunnel for secure remote access to a private network, but it does not expose internal web servers to the general internet on port 80.

Full explanation →

278

MCQmedium

A technician is configuring a virtual machine to host a database server that requires consistent high disk I/O performance. The host uses a RAID 10 array of SSDs. Which virtual disk type should the technician select to minimize overhead and maximize performance?

A.Dynamically expanding virtual disk

B.Fixed-size virtual disk

C.Differencing virtual disk

D.Thin provisioned virtual disk

AnswerB

A fixed-size virtual disk allocates its entire specified capacity on the host storage at the time of creation. This pre-allocation ensures that the virtual disk occupies contiguous blocks on the physical storage, minimizing fragmentation and reducing the overhead associated with dynamic allocation. This design significantly lowers I/O latency and improves read/write performance, making it the optimal choice for applications like databases that demand consistent, high-speed disk operations.

Why this answer

A fixed-size virtual disk preallocates all storage space at creation, eliminating the overhead of dynamically growing the file and reducing fragmentation. This provides more consistent high I/O performance, which is critical for a database server. Dynamically expanding and thin-provisioned disks incur allocation overhead during writes.

Exam trap

220-1201 often tests the performance trade-off between thick and thin provisioning, baiting candidates toward space-saving dynamic disks when the question emphasizes consistent high I/O.

How to eliminate wrong answers

Option A is wrong because dynamically expanding disks grow on demand, causing fragmentation and write-time overhead that hurts consistent I/O performance. Option C is wrong because differencing disks store only changes relative to a parent disk and are used for snapshots/checkpoints, adding read overhead and complexity, not performance. Option D is wrong because thin provisioning is essentially the same as dynamic expansion — it allocates space lazily, which can cause performance variability and overcommitment issues.

Full explanation →

279

MCQmedium

During a conference call, a user complains that their wireless earbuds keep disconnecting from their smartphone every few minutes. The earbuds work fine when paired with a different phone. What is the most likely cause?

A.The earbuds have a low battery.

B.The smartphone's Bluetooth driver is outdated.

C.Bluetooth interference from other devices in the conference room.

D.The earbuds are not compatible with the smartphone's Bluetooth version.

AnswerC

Conference rooms are often densely populated with numerous wireless devices, including other smartphones, laptops, Wi-Fi access points, and wireless peripherals, all operating within the crowded 2.4 GHz Industrial, Scientific, and Medical (ISM) radio band. This high concentration of active devices creates significant radio frequency (RF) interference, which can disrupt the Bluetooth signal between the smartphone and earbuds, leading to frequent and frustrating disconnections.

Why this answer

Bluetooth operates in the 2.4 GHz ISM band, which is shared with Wi-Fi, cordless phones, and other wireless devices. In a conference room with many active devices, RF interference can cause packet loss or retransmission delays, leading the Bluetooth Adaptive Frequency Hopping (AFH) mechanism to fail to avoid all congested channels, resulting in periodic disconnections. The fact that the earbuds work fine with a different phone isolates the issue to the smartphone's environment rather than the earbuds themselves.

Exam trap

The 220-1201 exam often tests the misconception that Bluetooth disconnections are always due to driver or compatibility issues, but the trap here is that environmental interference (especially in a conference room with many devices) is the most likely cause when the earbuds work elsewhere.

How to eliminate wrong answers

Option A is wrong because low battery in the earbuds would typically cause audio degradation, reduced range, or a single final disconnect, not repeated disconnections every few minutes; the earbuds work fine with another phone, ruling out a battery defect. Option B is wrong because an outdated Bluetooth driver would cause persistent pairing failures or inability to maintain any connection, not intermittent disconnects that occur only in a specific environment; the driver is the same regardless of location. Option D is wrong because Bluetooth is backward-compatible across versions (e.g., 4.0, 5.0, 5.2) for basic audio profiles like A2DP and HFP; if the earbuds were incompatible, they would not pair or function at all, and the user reports they work fine with a different phone.

Full explanation →

280

MCQhard

A user complains that their computer with a 256 GB NVMe SSD is running out of storage space. They want to add more internal storage but only have one M.2 slot. What is the best solution to expand capacity without sacrificing performance?

A.Replace the NVMe SSD with a larger capacity NVMe SSD.

B.Install a SATA SSD in an available 2.5-inch drive bay.

C.Use an external USB SSD for additional storage.

D.Add a second M.2 drive using a PCIe adapter card.

AnswerA

The most effective solution for a user running out of space on their primary 256 GB NVMe SSD is to replace it with a larger capacity NVMe SSD. This directly expands the primary storage volume, ensuring that the operating system and frequently accessed applications continue to benefit from the superior speed and low latency of the NVMe interface. It utilizes the existing M.2 slot efficiently, maintaining the highest possible storage performance without adding complexity or sacrificing speed.

Why this answer

Replacing the existing NVMe SSD with a larger capacity NVMe SSD is the best solution because it maintains the same high-speed performance (PCIe/NVMe) while expanding storage. The user only has one M.2 slot, so swapping the drive directly addresses capacity without adding slower interfaces or external dependencies. This avoids performance degradation and keeps the system simple.

Exam trap

220-1201 often tests the trade-off between capacity and performance, and candidates may choose a SATA or external option without realizing the significant speed difference.

How to eliminate wrong answers

Option B is wrong because a SATA SSD is significantly slower than NVMe (up to ~550 MB/s vs. 3,500+ MB/s), sacrificing performance. Option C is wrong because an external USB SSD is even slower and adds portability issues, not ideal for internal expansion. Option D is wrong because a PCIe adapter card may not be bootable, requires an available PCIe slot, and adds complexity; it also may not support NVMe boot without BIOS support.

Full explanation →

281

MCQmedium

A technician is troubleshooting a network where users can access the internet but cannot reach a specific internal web server by its hostname. Pinging the server's IP address works. What is the most likely issue?

A.The web server's firewall is blocking ICMP.

B.The DHCP server is not assigning correct IP addresses.

C.The DNS server does not have a record for the server's hostname.

D.The network switch is dropping packets to the server.

AnswerC

This is the correct explanation. The Domain Name System (DNS) is responsible for translating human-readable hostnames into numerical IP addresses. If users can successfully connect to the server using its IP address but fail when using its hostname, it indicates that the underlying network connectivity is sound, but the DNS server is unable to provide the corresponding IP address for that specific hostname. This is a classic symptom of a missing or incorrect A record (Address record) on the DNS server.

Why this answer

The user can reach the server by IP but not by hostname, which isolates the failure to name resolution rather than routing or connectivity. Since ping to the IP succeeds, the network path and the server itself are fine; the most likely cause is that the DNS server lacks an A (or AAAA) record mapping the hostname to the server's IP. Adding or correcting the DNS record resolves the issue.

Exam trap

220-1201 often tests whether candidates can distinguish name resolution failures from connectivity failures — the giveaway is that IP works but hostname does not, which points squarely at DNS, not firewalls or switches.

How to eliminate wrong answers

Option A is wrong because ICMP blocking would prevent ping from succeeding at all, but the technician already confirmed ping to the IP works, so ICMP is not being blocked. Option B is wrong because incorrect DHCP addressing would prevent the client from reaching the server by IP as well, and the user can reach the internet and ping the server IP successfully. Option D is wrong because a switch dropping packets would cause intermittent or total loss of connectivity to the IP, not a hostname-specific failure.

Full explanation →

282

MCQhard

A technician is upgrading a server's storage and needs to connect multiple SATA SSDs. The motherboard has only four SATA ports, but the technician needs to connect six drives. Which connector solution should be used?

A.Use a Y-splitter cable on one SATA port to connect two drives.

B.Install a PCIe SATA controller card with extra ports.

C.Use eSATA to SATA adapters on the external ports.

D.Replace the motherboard with one that has six SATA ports.

AnswerB

Installing a PCIe SATA controller card is the most practical and efficient solution for adding more internal storage. This card utilizes an available PCIe expansion slot to integrate an additional SATA host bus adapter (HBA), providing new, independent SATA ports. This allows the technician to connect additional internal drives to the server without replacing the motherboard or relying on external solutions, directly addressing the need for increased internal storage capacity.

Why this answer

A PCIe SATA controller card adds additional SATA ports through an available PCIe slot, which is the standard, supported way to expand beyond the motherboard's native port count. SATA does not support port multiplication via passive splitters, so adding a controller is the only reliable hardware solution short of replacing the motherboard. This preserves full bandwidth per drive and requires no changes to existing drives.

Exam trap

The trap is the Y-splitter option, which sounds plausible to candidates unfamiliar with SATA's point-to-point architecture; SATA has no master/slave concept and cannot be passively split like older IDE or power cables.

How to eliminate wrong answers

Option A is wrong because SATA does not support Y-splitter cables — each SATA port handles exactly one drive, and passive splitters either fail entirely or cause data corruption. Option C is wrong because eSATA ports are external connectors for external drives, not a way to add internal SATA ports, and adapters do not increase the port count. Option D is wrong because replacing the motherboard is a drastic, expensive solution when a $30 PCIe SATA card accomplishes the same goal without disturbing the existing system.

Full explanation →

283

MCQmedium

A small office uses a network switch with 24 RJ45 ports to connect all workstations. The switch is connected to the router via a single uplink port. Users report intermittent network drops. The technician suspects a faulty cable between the switch and router. Which tool should be used to test the cable?

A.Tone generator and probe

B.Loopback plug

C.Cable tester

D.Multimeter

AnswerC

A cable tester is the appropriate tool for diagnosing faults in Ethernet cables by verifying their electrical continuity and correct wiring according to T568A or T568B standards. It identifies issues such as opens (broken wires), shorts (wires touching), crossed pairs, reversed pairs, and split pairs, which can severely impact network communication. This specialized device provides a comprehensive assessment of the cable's physical layer integrity, confirming if it meets networking specifications.

Why this answer

A cable tester is the correct tool to verify continuity, pinout, and signal integrity on a copper Ethernet cable between the switch and router. It can detect opens, shorts, miswired pairs, and split pairs that cause intermittent link drops. This directly addresses the technician's suspicion of a faulty uplink cable.

Exam trap

The trap is confusing cable identification tools (toner/probe) with cable qualification tools (tester) — candidates pick the toner because it's associated with 'cables,' but it cannot detect electrical faults.

How to eliminate wrong answers

Option A is wrong because a tone generator and probe (toner) is used to trace and identify cables in a bundle, not to verify electrical performance or detect faults. Option B is wrong because a loopback plug tests a port's transmit/receive functionality on the device itself, not the cable between two devices. Option D is wrong because a multimeter measures voltage, current, and resistance on electrical circuits — it cannot certify Ethernet pinouts or detect high-frequency crosstalk issues that cause intermittent drops.

Full explanation →

284

MCQmedium

A technician is deploying a fleet of tablets for field workers. The tablets need to connect to a cellular network for data, but the company wants to minimize data usage. Which setting should the technician configure on each tablet?

A.Enable data saver mode.

B.Disable Wi-Fi.

C.Enable airplane mode.

D.Set the preferred network type to 5G.

AnswerA

Enabling data saver mode is the most effective solution for minimizing overall data consumption on a fleet of tablets. This feature actively restricts applications from utilizing background data, preventing them from sending or receiving information when not actively in use. Furthermore, it can prompt foreground applications, such as video streaming services or web browsers, to use less data by reducing content quality or preloading. This direct control over data transfer significantly reduces the total bytes consumed, helping to manage cellular plan costs.

Why this answer

Enabling Data Saver mode restricts background data usage and limits non-essential app activity, directly reducing cellular data consumption. This is the most appropriate setting for field workers who need to stay connected but minimize data costs, as it works at the OS level to restrict background syncs and downloads without disabling connectivity.

Exam trap

The 220-1201 exam often tests the distinction between disabling connectivity (Airplane Mode) and reducing data usage (Data Saver), where candidates mistakenly choose Airplane Mode thinking it saves data, but it completely cuts off the required cellular connection.

How to eliminate wrong answers

Option B is wrong because disabling Wi-Fi does not reduce cellular data usage; it only prevents the tablet from using Wi-Fi networks, which could actually increase cellular data consumption if Wi-Fi was available. Option C is wrong because enabling Airplane Mode disables all wireless radios, including cellular, preventing any data connectivity at all, which defeats the requirement for the tablets to connect to a cellular network. Option D is wrong because setting the preferred network type to 5G does not minimize data usage; 5G may encourage higher data consumption due to faster speeds and does not inherently restrict background data or app behavior.

Full explanation →

285

MCQhard

A technician is deploying a wireless network in a large warehouse with metal shelving. The goal is to provide seamless roaming for handheld scanners. Which technology should the technician implement to ensure clients quickly switch between access points without dropping connections?

A.Enable 802.11r (Fast Roaming) on the access points

B.Use a wireless mesh topology

C.Configure beamforming on each access point

D.Deploy MIMO antennas

AnswerA

802.11r, also known as Fast BSS Transition, significantly reduces the time a wireless client takes to re-authenticate when moving between access points within the same network. It achieves this by allowing the client and the new AP to pre-negotiate security keys or by caching existing keys, thus minimizing the authentication handshake duration. This seamless handoff is crucial for applications sensitive to latency, like VoIP or video streaming, ensuring an uninterrupted user experience.

Why this answer

802.11r, also known as Fast BSS Transition or Fast Roaming, enables clients to authenticate and reassociate with a new access point using a cached PMK (Pairwise Master Key) from the initial full authentication, reducing the handshake process from four EAP frames to two. In a warehouse with metal shelving causing signal attenuation, this minimizes the time clients spend scanning and reconnecting, ensuring seamless roaming for handheld scanners without dropping connections.

Exam trap

The 220-1201 exam often tests the distinction between coverage-enhancing features (beamforming, MIMO, mesh) and roaming-optimization protocols (802.11r, 802.11k, 802.11v), leading candidates to confuse signal improvement with handoff speed.

How to eliminate wrong answers

Option B is wrong because a wireless mesh topology extends coverage but does not inherently reduce roaming latency; mesh nodes can introduce additional hop delays and do not optimize the client handoff process. Option C is wrong because beamforming focuses RF energy toward specific clients to improve signal strength and throughput, but it does not address the authentication or reassociation delays that cause dropped connections during roaming. Option D is wrong because MIMO (Multiple Input Multiple Output) antennas increase data rates and reliability through spatial multiplexing and diversity, but they have no direct effect on the speed or efficiency of client transitions between access points.

Full explanation →

286

MCQmedium

During a network upgrade, a technician configures a new VoIP phone to use a dedicated VLAN for voice traffic. After connecting the phone to a switch port configured for voice VLAN, the phone powers on but cannot register with the call manager. The switch port is set to trunk mode. Which protocol is essential for the phone to obtain its VLAN assignment?

A.STP

B.LLDP

C.RSTP

D.GVRP

AnswerB

Link Layer Discovery Protocol (LLDP), particularly its Media Endpoint Discovery (LLDP-MED) extension, enables network devices to advertise their identity, capabilities, and specific network policies to directly connected devices. For VoIP phones, LLDP-MED allows a switch to communicate critical information such as the voice VLAN ID, power requirements (PoE), and QoS settings. This dynamic advertisement simplifies phone deployment and ensures the phone automatically configures itself to the correct voice VLAN, optimizing call quality and network segmentation.

Why this answer

Link Layer Discovery Protocol (LLDP) is essential because it allows the switch to inform the VoIP phone of the configured voice VLAN ID. When a switch port is in trunk mode, the phone uses LLDP (specifically LLDP-MED) to learn which VLAN to tag its voice traffic with, enabling it to communicate with the call manager. Without LLDP, the phone would not know which VLAN to use and would fail to register.

Exam trap

A+ candidates often confuse LLDP-MED with other protocols that manage VLANs between switches, such as GVRP, leading them to select GVRP instead of LLDP for endpoint VLAN assignment.

How to eliminate wrong answers

Option A is wrong because STP (Spanning Tree Protocol) prevents loops in a network topology and does not provide VLAN assignment information to endpoints. Option C is wrong because RSTP is an enhancement of STP for faster convergence and also does not convey VLAN IDs to devices. Option D is wrong because VTP (VLAN Trunking Protocol) manages VLAN databases across switches but does not communicate VLAN assignments to end devices like VoIP phones.

Full explanation →

287

MCQhard

A user reports that their inkjet printer produces output with horizontal white lines through text and images. The printer has been used heavily for months without maintenance. What should you do to resolve this issue?

A.Replace the fuser assembly

B.Perform a printhead alignment

C.Run the printer's printhead cleaning cycle

D.Replace the pickup rollers

AnswerC

Running the printer's printhead cleaning cycle is the primary and most effective troubleshooting step for resolving issues like missing lines, streaks, or faded output in inkjet printers. This utility forces a small amount of ink through each nozzle at high pressure, dislodging dried ink, dust, or other debris that may be causing blockages. By clearing these obstructions, the cleaning cycle restores the printhead's ability to eject ink consistently across all nozzles, thereby eliminating the white lines caused by clogged nozzles.

Why this answer

Horizontal white lines on inkjet output after months of heavy use without maintenance are a classic symptom of clogged printhead nozzles. Running the printer's built-in printhead cleaning cycle purges dried ink and restores uniform nozzle firing, resolving the streaks. This is the first and most appropriate corrective action before considering hardware replacement.

Exam trap

220-1201 often tests whether candidates confuse inkjet-specific maintenance (printhead cleaning, alignment) with laser printer components (fuser, pickup rollers), tempting them to select a hardware replacement when a simple maintenance cycle is the correct fix.

How to eliminate wrong answers

Option A is wrong because the fuser assembly is a laser printer component that bonds toner to paper; inkjet printers do not have fusers, so replacing it is irrelevant. Option B is wrong because printhead alignment corrects misregistration or skewed output (e.g., colors not lining up), not missing lines caused by clogged nozzles; alignment is a follow-up step after cleaning if needed. Option D is wrong because pickup rollers feed paper into the printer; worn rollers cause misfeeds or jams, not horizontal white lines in printed output.

Full explanation →

288

MCQmedium

A customer reports that after a recent fall, their smartphone's screen is completely black, but the device still vibrates when calls come in. The technician suspects the display cable is loose. What is the correct sequence of steps to access and reseat the display cable?

A.Remove the battery first, then the back cover, and reseat the display cable.

B.Remove the back cover, disconnect the battery, then reseat the display cable.

C.Reseat the display cable by inserting a spudger through the charging port.

D.Perform a factory reset to rule out software issues.

AnswerB

This sequence represents the standard and safest procedure for internal repairs on most mobile devices. Removing the back cover provides access to the internal components. Disconnecting the battery subsequently de-energizes the device, preventing accidental short circuits or electrical damage while manipulating internal components like the display cable. Reseating the display cable after these preparatory steps addresses the likely hardware issue caused by the fall.

Why this answer

The correct sequence is to remove the back cover first to access internal components, then disconnect the battery before reseating the display cable. Disconnecting the battery prevents electrical damage or short circuits while working on the display connector, which is a critical safety step in mobile device repair.

Exam trap

220-1201 often tests the correct order of hardware repair steps, and candidates may incorrectly assume battery removal comes before back cover removal or that software resets can fix hardware issues.

How to eliminate wrong answers

Option A is wrong because removing the battery before the back cover is impossible on most modern smartphones where the battery is internal and requires back cover removal first. Option C is wrong because inserting a spudger through the charging port cannot access the display cable and risks damaging the port and internal components. Option D is wrong because a factory reset is a software troubleshooting step and cannot fix a loose display cable; it also risks data loss and does not address the hardware issue.

Full explanation →

289

MCQmedium

A technician is configuring a new NAS with four 10 TB hard drives. The customer wants maximum usable capacity with fault tolerance for one drive failure. The technician sets up RAID 5, but after initialization, the usable capacity is only 10 TB instead of the expected 30 TB. What is the most likely cause?

A.One of the drives is defective and the array is using only three drives.

B.The array was accidentally configured as RAID 1 (mirroring) across two drives.

C.The drives are not all the same size; one is 5 TB.

D.The RAID controller is using a different stripe size.

AnswerB

Configuring the array as RAID 1 (mirroring) across two of the 10 TB drives would indeed result in a total usable capacity equal to the size of a single drive, which is 10 TB. In this setup, one 10 TB drive serves as an exact duplicate of the other 10 TB drive, providing data redundancy. The remaining two drives would either be unused, configured in a separate array, or potentially part of a different RAID volume, but the specific 10 TB usable capacity precisely matches a two-drive RAID 1 configuration.

Why this answer

RAID 5 with four drives of equal size should yield (n-1) * capacity = 30 TB. A 10 TB result suggests only two drives are being used, possibly due to a misconfiguration like RAID 1 or a stripe set of two drives. This tests RAID 5 capacity calculation and troubleshooting.

Full explanation →

290

MCQhard

A company deploys a new 802.11ax (Wi-Fi 6) access point to support high-density environments. Some older laptops with 802.11ac adapters cannot connect, while newer Wi-Fi 6 laptops work fine. The SSID is broadcast and security is set to WPA2. What is the MOST likely cause?

A.The access point is set to 802.11ax-only mode.

B.The laptops have outdated firmware that does not support OFDMA.

C.The access point is configured to use WPA3 only.

D.The 5 GHz radio is disabled on the access point.

AnswerA

The access point is configured to operate in 802.11ax-only mode, which disables the 802.11ac compatibility that older laptops require. Wi-Fi 6 access points can restrict operation to ax-only, excluding ac clients entirely. Enabling mixed mode (802.11ax/ac) restores connectivity for the older adapters while retaining Wi-Fi 6 features.

Why this answer

If the access point is set to 802.11ax-only mode, older 802.11ac adapters, which are not 802.11ax compliant, will be unable to connect. Newer Wi-Fi 6 (802.11ax) laptops, however, will connect successfully. This mode setting directly explains why only the newer standard devices can connect while older ones cannot, without contradicting the stated WPA2 security.

Exam trap

Candidates might overlook the explicit statement in the stem regarding WPA2 security, or assume that WPA3-only is a common misconfiguration despite the stem's information. The trap is to correctly identify a compatibility issue based on the Wi-Fi standard mode rather than a security protocol mismatch when the security protocol is explicitly stated as compatible.

How to eliminate wrong answers

Option A is wrong because 802.11ax access points are backward compatible with 802.11ac clients by default; setting the AP to 'ax-only' mode would prevent all older clients from connecting, but the question says only some older laptops cannot connect, and newer Wi-Fi 6 laptops work fine, which would not be the case if the AP were in ax-only mode. Option B is wrong because OFDMA is a feature of 802.11ax that improves efficiency in high-density environments, but it is not required for basic connectivity; 802.11ac clients do not support OFDMA at all, yet they can still connect to an 802.11ax AP as long as they support the same security and channel settings. Option D is wrong because if the 5 GHz radio were disabled, all 5 GHz clients (including newer Wi-Fi 6 laptops) would fail to connect, but the question states newer laptops work fine; additionally, 802.11ac operates exclusively on 5 GHz, so disabling that radio would prevent all 802.11ac clients from connecting, not just some.

Full explanation →

291

MCQmedium

A user reports that their computer randomly restarts when playing games. The technician suspects the CPU is overheating. Which tool should the technician use to monitor the CPU temperature under load?

A.Windows Task Manager

B.The BIOS/UEFI hardware monitor

C.A third-party utility like HWMonitor

D.Windows Event Viewer

AnswerC

A third-party utility like HWMonitor is the correct choice because it directly interfaces with the system's various hardware sensors, including those on the CPU, GPU, and motherboard. It provides real-time monitoring and logging of critical parameters such as core temperatures, fan speeds, and voltages, allowing a technician to observe peak temperatures reached during intensive activities like gaming. This granular data is essential for identifying thermal throttling or overheating that causes system instability and random restarts.

Why this answer

A third-party utility like HWMonitor reads the CPU's internal thermal sensors (via SMBus or vendor-specific interfaces) and can display real-time temperatures while the system is under load, which is exactly what's needed to confirm an overheating diagnosis. Because the random restarts occur during gaming (a heavy load scenario), the tool must be able to log or display live temperatures during that workload, which HWMonitor does well.

Exam trap

The trap here is assuming that built-in Windows tools (Task Manager, Event Viewer) or the BIOS monitor can report live CPU temperature under load — CompTIA 220-1201 frequently tests whether candidates know which tool actually exposes thermal sensor data during runtime.

How to eliminate wrong answers

Option A is wrong because Windows Task Manager shows CPU utilization percentage but does not expose CPU temperature readings. Option B is wrong because the BIOS/UEFI hardware monitor only shows temperature at boot or while in firmware setup — it cannot monitor the CPU under a Windows gaming load. Option D is wrong because Windows Event Viewer logs system events (including unexpected shutdown codes like Kernel-Power 41) but does not report CPU temperature values.

Full explanation →

292

MCQmedium

A technician is configuring a small office wireless router for a client. The client wants the network to be as secure as possible while still allowing employees to connect easily with a pre-shared key. The router supports WPA2, WPA3, WPA, and WEP. Which security protocol should the technician select?

A.WPA2-PSK with AES

B.WPA-PSK with TKIP

C.WPA3-Personal

D.WEP with 128-bit key

AnswerC

WPA3-Personal is the most secure option among those listed and is supported by the router. It uses SAE (Simultaneous Authentication of Equals) to provide forward secrecy and resistance to offline dictionary attacks, which WPA2-PSK lacks. It still allows easy connection with a pre-shared key, satisfying the client's requirement. Therefore, it is the best choice.

Why this answer

WPA3-Personal provides the strongest security among the listed protocols by using SAE, which enhances protection against offline dictionary attacks and adds forward secrecy. It still supports a pre-shared key for easy employee connectivity. WPA2 is secure but less robust, while WPA and WEP are deprecated and vulnerable.

Thus, WPA3-Personal is the correct choice for maximum security with a pre-shared key.

Exam trap

The trap here is assuming that WPA2 is always the most secure option, overlooking that WPA3 is now widely supported and offers significant security improvements.

Full explanation →

293

MCQmedium

A user reports that their laptop can see multiple Wi-Fi networks but cannot connect to any of them. Other devices in the same location connect without issue. What is the most likely cause?

A.The laptop's wireless adapter is disabled in Device Manager.

B.The Wi-Fi router is out of range.

C.The laptop has an incorrect or outdated Wi-Fi password saved for the networks.

D.The laptop's Bluetooth is interfering with Wi-Fi.

AnswerC

An incorrect or outdated Wi-Fi password, also known as a Pre-Shared Key (PSK), will prevent a laptop from successfully authenticating with an access point, even if the network's SSID is clearly visible. The laptop can detect the network and attempt to connect, but the authentication handshake will fail due to the credential mismatch. This scenario perfectly aligns with seeing networks but being unable to establish a connection, often resolved by 'forgetting' the network and re-entering the correct password.

Why this answer

The laptop can see multiple Wi-Fi networks (indicating the wireless adapter is functional and scanning is successful) but fails to connect to any of them. This points to a common credential mismatch issue: if the saved password for a network is incorrect or outdated, the 4-way handshake (WPA2/WPA3) will fail, preventing association even though the SSID is visible. Other devices connecting successfully rules out router-side problems.

Exam trap

The 220-1201 exam often tests the distinction between the ability to scan/detect networks (Layer 2 passive/active scanning) and the ability to authenticate/associate (Layer 2 authentication handshake), leading candidates to incorrectly suspect hardware or interference issues when the real problem is credential mismatch.

How to eliminate wrong answers

Option A is wrong because if the wireless adapter were disabled in Device Manager, the laptop would not see any Wi-Fi networks at all, as the adapter would be non-functional for scanning. Option B is wrong because the laptop can see multiple networks, which requires being within range of the router; being out of range would result in no visible networks. Option D is wrong because Bluetooth operates in the 2.4 GHz ISM band and can cause interference that degrades throughput or causes disconnections, but it does not prevent initial association or the ability to see networks, and the scenario describes a complete inability to connect, not intermittent issues.

Full explanation →

294

MCQeasy

A company deploys a new multifunction printer that supports both USB and network connectivity. The printer is installed in a conference room and must be accessible to all employees on the same subnet. Which connection method should the technician use?

A.Connect the printer via USB to the nearest workstation

B.Connect the printer to the network using an Ethernet cable

C.Use a USB-to-Ethernet adapter

D.Enable Wi-Fi Direct on the printer

AnswerB

Connecting the multifunction printer to the company's local area network (LAN) via an Ethernet cable is the most appropriate and robust solution for shared office environments. This method assigns the printer an IP address, making it a network-attached device that all authorized users on the subnet can discover and utilize for printing, scanning, and other functions. Ethernet provides a stable, high-bandwidth connection, ensuring reliable access and efficient operation for multiple users simultaneously across the entire company infrastructure.

Why this answer

The printer must be accessible to all employees on the same subnet, so the technician should connect it directly to the network via Ethernet. This gives the printer its own IP address and allows any authorized user on the LAN to send print jobs over standard protocols like IPP or LPD. USB and Wi-Fi Direct are point-to-point connections that do not provide shared network access.

Exam trap

The trap here is confusing direct connection methods (USB, Wi-Fi Direct) with true network connectivity; candidates might think any wireless or adapter solution provides shared access, but only a direct Ethernet connection to the LAN gives the printer its own network identity.

How to eliminate wrong answers

Option A is wrong because USB is a direct, point-to-point connection that only allows the attached workstation to use the printer, not all employees. Option C is wrong because a USB-to-Ethernet adapter still requires a host computer to share the connection and does not give the printer a native network presence. Option D is wrong because Wi-Fi Direct creates a direct peer-to-peer wireless link, typically for one device at a time, and does not integrate the printer into the subnet for shared access.

Full explanation →

295

MCQhard

A user reports that their multifunction printer makes a loud grinding noise when printing, and the output has vertical black streaks. The technician has already replaced the toner cartridge. What component is most likely failing?

A.The fuser assembly

B.The imaging drum

C.The pickup rollers

D.The transfer roller

AnswerB

The imaging drum, or photoconductive drum, is crucial in laser printing as it receives the electrostatic image and transfers toner to the paper. If the drum's surface is scratched, worn, or damaged, it will fail to hold the electrostatic charge uniformly, resulting in distinct vertical streaks on the printed page where toner is either missing or excessively applied. A physical defect or misalignment can also cause a grinding noise as the drum rotates and interacts with other components like the toner cartridge or cleaning blade.

Why this answer

This question tests advanced troubleshooting of laser printer mechanical issues. The imaging drum is a common wear item that can cause grinding noises and vertical streaks when damaged. The fuser or pickup rollers would produce different symptoms.

Full explanation →

296

MCQhard

A technician is configuring a high-performance workstation for scientific simulations that require large amounts of RAM. The motherboard has eight DDR4 slots and supports quad-channel memory. The technician installs four 16 GB sticks in the correct slots for quad-channel mode. After booting, the system reports 64 GB of RAM but only runs in dual-channel mode. What is the most likely cause?

A.The RAM sticks are not identical in speed and timings.

B.The motherboard BIOS needs to be configured to enable quad-channel mode.

C.The installed CPU only supports dual-channel memory.

D.The RAM is installed in the wrong slots for quad-channel operation.

AnswerC

The CPU's integrated memory controller (IMC) is the fundamental component that dictates the maximum number of memory channels a system can utilize. Even if a motherboard is physically capable of supporting quad-channel memory and four identical RAM sticks are installed, a CPU designed with only a dual-channel IMC will inherently limit the system to operating in dual-channel mode. The additional RAM will still be recognized and usable, but it will be accessed through the existing two channels, not an expanded quad-channel configuration.

Why this answer

Quad-channel memory operation depends on the CPU's integrated memory controller supporting four channels. If the installed CPU only has a dual-channel memory controller (common on many consumer and even some workstation chips), the motherboard will populate all four DIMMs but can only operate them in dual-channel mode. The reported 64 GB confirms all sticks are detected, so the limitation is the CPU, not the DIMMs or slots.

Exam trap

220-1201 often tests the misconception that quad-channel is a BIOS setting or a DIMM-count issue — the real determinant is the CPU's memory controller, which candidates overlook.

How to eliminate wrong answers

Option A is wrong because mismatched speeds or timings would typically cause the system to downclock to the slowest common speed or fail to POST — it would not silently drop from quad-channel to dual-channel while still reporting full capacity. Option B is wrong because quad-channel is a hardware capability determined by the CPU and motherboard wiring, not a BIOS toggle that can be enabled or disabled. Option D is wrong because the scenario explicitly states the sticks were installed in the correct slots for quad-channel mode.

Full explanation →

297

MCQmedium

A user on a corporate iPhone cannot receive push notifications from the company's email app, even though notifications are enabled in the app settings. Other apps on the phone receive notifications normally. What should the technician check first?

A.Verify that the device is not in Do Not Disturb mode.

B.Check the notification settings for the email app in iOS Settings.

C.Reinstall the email app to reset its configuration.

D.Update the iPhone to the latest iOS version.

AnswerB

iOS provides granular control over notification preferences for each installed application, accessible within the main iOS Settings app. For an email application to successfully deliver push notifications, its specific notification settings (e.g., 'Allow Notifications,' 'Sounds,' 'Banners,' 'Badges') must be explicitly enabled at the operating system level. Even if the email app itself is configured to push new mail, a disabled system-level toggle will override and prevent any notifications from being displayed or heard, making this the most direct and common solution.

Why this answer

The problem is isolated to a single app (the email app) while other apps receive notifications normally. This indicates the issue is not with the device's system-wide notification settings (like Do Not Disturb) but rather with the app-specific notification permissions within iOS Settings. The technician should first check the notification settings for the email app in iOS Settings to ensure that 'Allow Notifications' is toggled on and that the desired alert styles (e.g., banners, sounds, badges) are configured correctly, as these settings override any in-app notification preferences.

Exam trap

The 220-1201 exam often tests the distinction between app-specific settings and system-wide settings, trapping candidates who assume that enabling notifications within the app is sufficient without verifying the iOS Settings override.

How to eliminate wrong answers

Option A is wrong because Do Not Disturb mode affects all notifications system-wide, not just those from a single app; since other apps receive notifications normally, Do Not Disturb is not the cause. Option C is wrong because reinstalling the app is a more drastic step that should only be taken after verifying the notification settings in iOS Settings, as the issue is likely a misconfiguration in the OS-level permissions rather than a corrupted app configuration. Option D is wrong because updating the iOS version is a general troubleshooting step that addresses system-wide bugs, but the problem is isolated to one app and other apps work fine, making an iOS update unlikely to resolve the specific notification issue.

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298

MCQmedium

A client wants to add a second internal hard drive to their desktop for additional storage, but all SATA ports on the motherboard are already used. What is the best solution?

A.Use a USB-to-SATA adapter and connect the drive externally.

B.Install a SATA expansion card into an available PCIe slot.

C.Replace the motherboard with one that has more SATA ports.

D.Use an external hard drive enclosure connected via USB.

AnswerB

Installing a SATA expansion card into an available PCIe slot is the most appropriate solution. This card provides additional internal SATA ports directly connected to the motherboard's high-speed PCIe bus, allowing the new hard drive to be installed inside the computer case. This method efficiently expands the system's internal storage capacity while ensuring optimal performance for the added drive.

Why this answer

An eSATA or SATA expansion card adds more SATA ports via a PCIe slot. USB adapters are slower, and replacing the motherboard is unnecessary. External enclosures are not internal.

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299

MCQeasy

A technician is upgrading a client's laptop from 8 GB to 16 GB of RAM. After installing the new module, the laptop powers on but the screen remains black, and the system emits a series of short beeps. What is the most likely issue?

A.The new RAM module is incompatible with the laptop's chipset.

B.The RAM module is not fully seated in the slot.

C.The laptop's battery is dead.

D.The RAM is installed in the wrong orientation.

AnswerB

When a RAM module is not fully seated in its slot, its electrical contacts fail to establish a complete and reliable connection with the motherboard's memory slot pins. This prevents the CPU from properly detecting and initializing the system memory during the Power-On Self-Test (POST) sequence. The BIOS/UEFI firmware, unable to find or access the required RAM, then generates a specific series of audible beep codes to signal a critical memory error, while the display remains black because the system cannot proceed with the boot process.

Why this answer

A series of short beeps on power-on is a classic POST (Power-On Self-Test) beep code indicating a memory error. Since the laptop was just upgraded, the most likely cause is that the new RAM module is not fully seated in its slot, preventing proper electrical contact. Reseating the module typically resolves the issue.

Exam trap

The trap here is that candidates may overthink the issue and choose 'incompatible RAM' when the most common cause after an upgrade is simply improper seating. The beep code is a strong clue that points to a physical connection problem, not compatibility.

How to eliminate wrong answers

Option A is wrong because an incompatible RAM module would usually cause the system to fail to boot entirely or produce a different beep pattern, but not the specific short beeps associated with a seating issue; incompatibility often results in no POST at all or a continuous beep. Option C is wrong because a dead battery would prevent the laptop from powering on at all, not produce beep codes; the laptop is already powering on. Option D is wrong because RAM modules are keyed to prevent incorrect orientation; they can only be inserted one way, so wrong orientation is physically impossible without excessive force.

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300

MCQhard

A network engineer is designing a new data center and needs to connect multiple servers to a core switch with redundant paths. To prevent loops while allowing failover, which networking hardware feature should be implemented?

A.Enable Link Aggregation Control Protocol (LACP) on the server connections.

B.Enable Rapid Spanning Tree Protocol (RSTP) on all switches.

C.Use a hub instead of a switch for the core connection.

D.Configure all switch ports as access ports.

AnswerB

Enabling Rapid Spanning Tree Protocol (RSTP) on all switches is the correct approach for a data center design with redundant paths. RSTP actively prevents network switching loops by logically blocking redundant links, ensuring only a single active path exists between any two network segments. Furthermore, RSTP offers significantly faster convergence times compared to traditional STP, quickly restoring connectivity in milliseconds should an active link fail, which is critical for maintaining high availability in a data center environment.

Why this answer

Rapid Spanning Tree Protocol (RSTP) is the correct choice because it provides loop prevention in redundant switch topologies while offering faster convergence than classic STP. In a data center with multiple servers connected to a core switch via redundant paths, RSTP (IEEE 802.1w) ensures that only one active path exists at a time, blocking redundant links to prevent broadcast storms and MAC table instability, yet automatically unblocking them if the primary path fails.

Exam trap

The 220-1201 exam often tests the misconception that LACP or link aggregation alone can prevent loops, when in fact LACP requires a spanning tree protocol (like RSTP) to be active on the aggregated links to avoid Layer 2 loops in redundant topologies.

How to eliminate wrong answers

Option A is wrong because Link Aggregation Control Protocol (LACP) bundles multiple physical links into a single logical link to increase bandwidth and provide load balancing, but it does not prevent loops in a redundant topology — in fact, LACP itself can create loops if the aggregated links are part of a larger redundant network without a spanning tree protocol. Option C is wrong because using a hub instead of a switch for the core connection would create a single collision domain, severely degrade performance, and still not prevent loops; hubs simply repeat all traffic and do not perform any loop prevention. Option D is wrong because configuring all switch ports as access ports would force them into a single VLAN, eliminating VLAN segmentation and potentially causing Layer 2 loops if redundant paths exist, as access ports do not inherently block loops — spanning tree must still be enabled.

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CompTIA A+ Core 1 220-1201 (220-1201) — Questions 226–300