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CompTIA A+ Core 1 220-1201 (220-1201) — Questions 526–600

1020 questions total · 14pages · All types, answers revealed

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526

MCQhard

A company uses a custom Android app that stores data locally. After a recent OS update, the app fails to write data to the internal storage, but it can read existing data. The app has all necessary permissions. What is the most likely cause?

A.The internal storage is full and cannot accept new data.

B.The OS update introduced scoped storage restrictions that the app does not support.

C.The app's cache needs to be cleared to free up space.

D.The device's SD card has been removed.

AnswerB

Scoped storage limits direct file access; apps targeting older Android versions may not be able to write without using new APIs.

Why this answer

This question tests advanced knowledge of Android storage changes. Starting with Android 11, scoped storage restrictions limit how apps access shared storage. Even with permissions, apps may need to use specific APIs (like MediaStore or SAF) to write files.

The app likely needs an update to comply with the new storage model.

Full explanation →

527

MCQeasy

A customer reports that their laptop connects to the office Wi-Fi but cannot access the internet. Other devices on the same network work fine. The technician checks the laptop's IP configuration and sees an IP address of 169.254.15.22. What is the most likely cause of this issue?

A.The DNS server is misconfigured.

B.The laptop's network adapter is faulty.

C.The DHCP server is out of available IP addresses.

D.The laptop's DHCP client is failing to obtain an IP address.

AnswerD

The 169.254 address is a self-assigned APIPA address, which occurs when the DHCP client cannot contact the DHCP server. This is the correct diagnosis.

Why this answer

The IP address 169.254.15.22 falls within the Automatic Private IP Addressing (APIPA) range (169.254.0.0/16), which Windows assigns when the DHCP client fails to receive a valid IP from a DHCP server. Since other devices on the same network work fine, the DHCP server is not exhausted; rather, this specific laptop's DHCP client could not complete the DORA process, likely due to a misconfiguration, firewall blocking DHCP traffic, or a driver issue. Option D correctly identifies that the DHCP client is failing to obtain an IP address, as evidenced by the APIPA address.

Exam trap

CompTIA A+ often tests the distinction between a DHCP server being out of addresses (which would affect all clients) versus a client-specific DHCP failure (which results in an APIPA address only for that client), leading candidates to incorrectly choose 'DHCP server is out of available IP addresses' when the symptom is isolated to one device.

How to eliminate wrong answers

Option A is wrong because a misconfigured DNS server would not prevent the laptop from obtaining an IP address; DNS issues occur after a valid IP is assigned, and the APIPA address indicates the DHCP process itself failed. Option B is wrong because a faulty network adapter would typically show no link light or connectivity at all, not a successful association with the Wi-Fi and an APIPA address; the adapter is functional enough to receive an APIPA lease. Option C is wrong because if the DHCP server were out of available IP addresses, other devices on the same network would also fail to obtain an IP and would show APIPA addresses, but the question states other devices work fine, ruling out pool exhaustion.

Full explanation →

528

MCQeasy

A user reports that their MFP is making a loud grinding noise when printing, and the output pages have vertical streaks. The MFP is a laser printer with a separate toner cartridge and imaging drum. What is the most likely cause?

A.The toner cartridge is low on toner.

B.The fuser unit is failing.

C.The imaging drum is damaged or worn.

D.The paper tray is misaligned.

AnswerC

A damaged drum can cause vertical streaks and grinding as it rotates unevenly, producing the reported symptoms.

Why this answer

Vertical streaks on laser printer output often indicate a damaged or worn imaging drum. The grinding noise suggests a mechanical issue with the drum rotation, which is a common failure point in laser MFPs.

Full explanation →

529

MCQeasy

A customer reports that their new Bluetooth headphones pair with their smartphone but produce no audio during calls. The headphones work fine with other devices. What is the most likely cause?

A.The headphones are out of battery.

B.The smartphone's Bluetooth antenna is damaged.

C.The smartphone does not support the required Bluetooth profile for call audio.

D.The headphones are paired to too many devices simultaneously.

AnswerC

Bluetooth profiles like HFP or HSP are needed for call audio; A2DP only handles music. If the phone lacks these profiles, calls will be silent.

Why this answer

The most likely cause is that the smartphone does not support the Hands-Free Profile (HFP) or Headset Profile (HSP) required for bidirectional call audio over Bluetooth. While the headphones may pair and work for media audio using A2DP, these profiles are distinct and must be supported by both devices for voice calls. Since the headphones work with other devices, the issue is specific to the smartphone's Bluetooth profile support.

Exam trap

The 220-1201 exam often tests the distinction between Bluetooth pairing/connection and profile support, trapping candidates who assume that successful pairing guarantees full functionality across all audio use cases.

How to eliminate wrong answers

Option A is wrong because if the headphones were out of battery, they would not pair or maintain a connection, and they would also fail to produce audio with other devices. Option B is wrong because a damaged Bluetooth antenna would typically cause intermittent connectivity, range issues, or failure to pair entirely, not a selective inability to route call audio while still pairing successfully. Option D is wrong because Bluetooth headphones can be paired with multiple devices but can only be actively connected to one audio source at a time; pairing to many devices does not prevent audio during calls on the currently connected device.

Full explanation →

530

MCQhard

A client reports that their 5 GHz Wi-Fi connection works fine near the access point but drops out completely when they move to the next room, which has thick concrete walls. The 2.4 GHz band works throughout the house. Which of the following is the BEST solution?

A.Replace the access point with a higher-gain antenna.

B.Install a wireless repeater in the next room.

C.Deploy a mesh Wi-Fi system with nodes in each room.

D.Switch the client to 2.4 GHz only.

AnswerC

Mesh systems use multiple nodes to create a seamless network, overcoming obstacles by placing nodes closer to clients.

Why this answer

A mesh Wi-Fi system (Option C) is the best solution because it uses multiple nodes that communicate wirelessly to create a unified network, overcoming signal attenuation caused by thick concrete walls. Unlike a single access point or repeater, mesh nodes are placed in each room to ensure strong 5 GHz coverage by relaying traffic through dedicated backhaul channels, mitigating the high-frequency signal loss that occurs through dense materials.

Exam trap

Cisco often tests the misconception that a higher-gain antenna or a simple repeater can solve signal penetration issues through dense materials, when in fact these solutions fail to address the fundamental physics of 5 GHz attenuation and require a distributed architecture like mesh to maintain performance.

How to eliminate wrong answers

Option A is wrong because replacing the access point with a higher-gain antenna increases signal strength in one direction but does not solve the fundamental problem of signal penetration through thick concrete walls; 5 GHz signals are more easily absorbed by dense materials, and a higher-gain antenna cannot bypass physical obstructions. Option B is wrong because a wireless repeater in the next room would still rely on the weakened 5 GHz signal from the original access point to connect, resulting in poor performance or no connection due to the concrete wall attenuation; repeaters also introduce latency and halve throughput. Option D is wrong because switching the client to 2.4 GHz only avoids the problem rather than solving it, sacrificing the higher throughput and lower interference benefits of 5 GHz; it is a workaround, not a proper solution.

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531

MCQeasy

A client wants to upgrade their workstation with a high-end GPU that requires two 8-pin PCIe power connectors. Their current power supply has only one 6+2 pin PCIe cable. What is the best solution to safely power the new GPU?

A.Use a Molex-to-PCIe adapter to create a second 8-pin connector

B.Install a new power supply that has two 8-pin PCIe cables

C.Connect the GPU using only the 6+2 pin cable and leave the second connector empty

D.Use a Y-splitter on the existing 6+2 pin cable to create two 8-pin connectors

AnswerB

A new PSU with dedicated PCIe cables ensures adequate power delivery and safety, meeting the GPU's requirements without adapters.

Why this answer

Using a modular power supply with the correct cables is safest because it ensures proper gauge and pinout. Adapters can be risky if they exceed the power supply's capacity or cable rating. Replacing the PSU is the most reliable solution for high-power GPUs.

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532

MCQmedium

A user's iPhone connects to a public Wi-Fi hotspot but cannot load any web pages. The Wi-Fi icon shows full signal. Other devices on the same network work fine. What is the most likely issue?

A.The iPhone's DNS settings are misconfigured.

B.The iPhone is not accepting the captive portal's terms and conditions.

C.The iPhone's Wi-Fi antenna is faulty.

D.The public Wi-Fi network is using an incompatible security protocol.

AnswerB

Many public Wi-Fi networks require accepting terms via a web page; if the portal doesn't load or the user hasn't accepted, internet access is blocked.

Why this answer

The most likely issue is that the iPhone has connected to the Wi-Fi network but has not completed the captive portal authentication process. Captive portals require users to accept terms and conditions or log in via a web page before internet access is granted. Since other devices work fine, the network itself is functional, and the iPhone's full signal indicates a good physical connection, pointing to a failure in the portal acceptance step.

Exam trap

The 220-1201 exam often tests the distinction between 'connected to Wi-Fi' and 'authenticated via captive portal,' trapping candidates who assume a full signal and IP address mean full internet access.

How to eliminate wrong answers

Option A is wrong because DNS misconfiguration would typically cause name resolution failures but not prevent all web page loading; more importantly, if the iPhone were already past the captive portal, DNS would be functional, and the symptom here is a pre-authentication block. Option C is wrong because a faulty Wi-Fi antenna would result in weak or no signal, not full signal bars, and would affect all network communication, not just web browsing. Option D is wrong because public Wi-Fi hotspots almost always use open or WPA2-PSK security, and an incompatible security protocol would prevent the iPhone from associating with the network entirely, not just block web pages after connection.

Full explanation →

533

MCQmedium

A small business uses an MFP that also functions as a network scanner. Users can scan to a shared folder on a Windows PC, but some users get an 'Access Denied' error when scanning. Other users can scan successfully. What is the most likely cause?

A.The network switch port is faulty.

B.The MFP's firmware is outdated.

C.The MFP's scan-to-folder credentials do not have write permissions to the shared folder.

D.The Windows firewall is blocking the MFP.

AnswerC

If the MFP's service account lacks write permissions, it will get an access denied error. Other users may be using different credentials or methods.

Why this answer

Scan to folder requires the MFP to have write permissions to the shared folder. If the MFP uses a generic service account, that account must have appropriate NTFS and share permissions. The issue is likely permission-related for the MFP's credentials.

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534

MCQhard

A user complains that their wireless Bluetooth earbuds frequently disconnect during calls when their smartphone is in their pocket. The earbuds work fine when the phone is on a desk. Which accessory or configuration change is most likely to resolve this issue?

A.A Bluetooth signal booster app

B.A Bluetooth neckband style headset

C.A metal phone case

D.A Wi-Fi analyzer to change router channels

AnswerB

Neckband headsets have the Bluetooth receiver near the user's collar, reducing signal blockage from the body.

Why this answer

The issue is that the smartphone's Bluetooth antenna is being physically blocked or attenuated by the user's body (specifically the leg/torso) when the phone is in a pocket. A Bluetooth neckband-style headset places the Bluetooth receiver and antenna around the user's neck, which is typically above the pocket and has a clearer line-of-sight to the phone, significantly reducing signal obstruction and multipath interference. This configuration change directly addresses the physical signal path problem without requiring any software or network changes.

Exam trap

The 220-1201 exam often tests the misconception that Bluetooth issues are always caused by RF interference or software problems, when in reality the most common cause of intermittent disconnections with portable devices is physical signal obstruction by the user's own body.

How to eliminate wrong answers

Option A is wrong because a 'Bluetooth signal booster app' cannot overcome physical signal attenuation caused by the human body; Bluetooth operates in the 2.4 GHz ISM band, and software cannot amplify or redirect the radio signal from the phone's antenna. Option C is wrong because a metal phone case would actually worsen the problem by further shielding the phone's Bluetooth antenna, increasing signal loss and disconnections. Option D is wrong because a Wi-Fi analyzer to change router channels addresses co-channel interference from Wi-Fi networks, but the problem is a physical obstruction (the user's body) between the phone and earbuds, not RF interference from other devices.

Full explanation →

535

MCQhard

A technician is replacing a failed motherboard in a desktop PC. The original motherboard had an LGA1151 socket. The replacement motherboard has an LGA1200 socket. The technician attempts to install the original CPU but finds it does not fit. What is the most likely reason?

A.The CPU is incompatible with the new motherboard's chipset

B.The CPU has a different number of pins

C.The power supply connector is different

D.The CPU is an AMD processor

AnswerB

LGA1151 CPUs have 1151 pins, while LGA1200 has 1200; the different pin count and layout prevent physical installation.

Why this answer

LGA sockets are keyed for specific generations of CPUs. LGA1151 is used for 6th/7th/8th/9th gen Intel, while LGA1200 is for 10th/11th gen. The physical pin count and keying are different, so a CPU designed for LGA1151 cannot be inserted into an LGA1200 socket.

The chipset is irrelevant to physical fit, and the power connector is unrelated.

Full explanation →

536

MCQmedium

A user wants to add a second hard drive to their desktop for extra storage, but the computer only has one SATA data cable available. The technician has an extra SATA power cable from the power supply. What is the most practical solution?

A.Use a Y-splitter on the existing SATA data cable to connect both drives.

B.Purchase an additional SATA data cable and use the existing power cable.

C.Connect the second drive using an external USB-to-SATA adapter.

D.Replace the existing hard drive with a larger one.

AnswerB

The technician has an extra power cable, so they only need a SATA data cable to connect the second drive.

Why this answer

This question tests understanding of SATA connectivity requirements. Each SATA drive needs its own data cable, but power can be shared via splitters or by using available power connectors.

Full explanation →

537

MCQmedium

A laptop's touchpad is not working correctly; the cursor jumps erratically. You have already updated the driver and checked for debris. What hardware component should you inspect or replace next?

A.Replace the entire keyboard assembly.

B.Reseat the touchpad ribbon cable on the motherboard.

C.Replace the laptop's LCD screen.

D.Reinstall the operating system.

AnswerB

A loose or partially connected ribbon cable is a common cause of erratic touchpad behavior.

Why this answer

This question tests systematic troubleshooting of input devices. After ruling out software and debris, the next step is to check the touchpad's ribbon cable connection to the motherboard. A loose or damaged cable can cause erratic behavior.

Replacing the touchpad itself is a later step.

Full explanation →

538

MCQmedium

A technician is troubleshooting a display that shows vertical lines across the entire screen. The lines persist when a different video cable is used, and the monitor works fine when connected to another computer. What is the most likely cause?

A.The monitor's panel is defective.

B.The graphics card driver is corrupted.

C.The video cable is damaged.

D.The monitor's refresh rate is set incorrectly.

AnswerB

Corrupted drivers can cause display artifacts like vertical lines. Reinstalling or updating the driver often resolves the issue.

Why this answer

Vertical lines that persist with different cables but disappear on another computer indicate a problem with the graphics card or its driver on the original computer. The monitor is proven good, so the issue is with the video source.

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539

MCQeasy

A technician is building a new workstation for video editing and needs to ensure the power supply can handle dual GPUs and multiple hard drives. Which specification is most critical to check when selecting a PSU?

A.The total wattage rating of the power supply.

B.The number of SATA power connectors.

C.The combined amperage on the +12V rail(s).

D.The physical form factor (ATX, SFX, etc.).

AnswerC

The +12V rail powers the most demanding components; its amperage multiplied by 12 gives the available wattage for those parts. This is the key spec for high-performance builds.

Why this answer

The +12V rail provides power to the CPU, GPUs, and drives; its combined amperage determines how much power can be delivered to these components. For high-power builds, a single +12V rail with high amperage or multiple rails with sufficient combined capacity is essential. Neglecting this can lead to instability or shutdowns under load.

Full explanation →

540

MCQmedium

A user connects a USB-C docking station to their laptop and finds that the external monitor works, but the Ethernet port on the dock does not provide network connectivity. The laptop's built-in Wi-Fi works fine. Which is the most likely cause?

A.The Ethernet cable is faulty

B.The USB-C port on the laptop is damaged

C.The docking station's Ethernet driver is not installed

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

AnswerC

Many USB-C docks require specific drivers for Ethernet to function; without them, the network adapter is not recognized.

Why this answer

Option C is correct because USB-C docking stations often require specific drivers for their integrated Ethernet adapters to function. Since the external monitor works, the USB-C connection itself is functional, isolating the issue to the Ethernet component. The missing driver prevents the OS from recognizing the network interface, even though the dock's other features operate normally.

Exam trap

The trap here is that candidates assume a working monitor proves the entire dock is functional, overlooking that USB-C alternate mode for DisplayPort can work independently of the USB data lines or the dock's embedded peripherals, each of which may have separate driver requirements.

How to eliminate wrong answers

Option A is wrong because a faulty Ethernet cable would typically cause a link light to be absent or intermittent, but the scenario does not mention any physical layer indicators; moreover, the dock's Ethernet port is completely non-functional, which is more consistent with a driver issue. Option B is wrong because the external monitor works through the same USB-C port, proving the port is capable of data and video transmission; a damaged port would likely affect all functions, not just Ethernet. Option D is wrong because Wi-Fi and Ethernet operate on separate network stacks and can coexist; the laptop's Wi-Fi working fine does not prevent the Ethernet interface from being detected or configured if the driver is present.

Full explanation →

541

MCQmedium

A small office has a multifunction device that prints, scans, and faxes. Users report that incoming faxes are not being received, but outgoing faxes work. The MFP is connected to a VoIP phone system. What is the most likely issue?

A.The fax line is plugged into the wrong port on the MFP.

B.The MFP's fax memory is full.

C.The VoIP system is not configured for T.38 fax protocol.

D.The MFP's firmware is outdated.

AnswerC

Without T.38, VoIP compression can corrupt fax tones during reception, causing incoming faxes to fail while outgoing faxes may still work.

Why this answer

VoIP systems often use codecs that compress audio, which can interfere with fax tones. The T.38 protocol is designed to transmit faxes over IP networks reliably. Without it, incoming faxes may fail while outgoing faxes might still work if the MFP negotiates differently.

Full explanation →

542

MCQmedium

A user reports that their laptop's battery drains quickly when connected to a USB-C docking station, even when the laptop is plugged into the dock's power delivery port. The dock supports 60W power delivery, but the laptop requires 65W. What is the most likely issue?

A.The laptop's battery is failing

B.The dock's power delivery is insufficient for the laptop

C.The USB-C cable is not rated for power delivery

D.The laptop is running high-performance mode

AnswerB

When the dock provides less power than the laptop needs, the laptop supplements from its battery, leading to gradual discharge.

Why this answer

The dock supports 60W power delivery, but the laptop requires 65W. When the power provided is less than the laptop's demand, the laptop will draw power from both the dock and its internal battery to meet the shortfall, causing the battery to drain even while connected. This is a classic case of insufficient power delivery from the dock, not a battery failure or cable issue.

Exam trap

The CompTIA A+ exam often tests the misconception that any USB-C cable or dock will charge a laptop as long as it's connected, ignoring the specific wattage requirements and the USB-PD negotiation process.

How to eliminate wrong answers

Option A is wrong because a failing battery would typically show symptoms like sudden shutdowns or inability to hold a charge even when the laptop is on its own charger, not specifically when connected to a dock. Option C is wrong because if the USB-C cable were not rated for power delivery, the laptop would not charge at all or would show a 'not charging' status, rather than draining slowly while connected. Option D is wrong because high-performance mode increases power draw, but the core issue is that the dock cannot supply the required wattage; even in balanced mode, the laptop would still draw more than 60W under load, leading to battery drain.

Full explanation →

543

MCQmedium

A user complains that their PC is running slowly, especially when opening multiple browser tabs. The system has 4 GB of RAM installed, and the OS is Windows 10 64-bit. Task Manager shows memory usage consistently at 90-95%. Which upgrade would provide the most immediate performance improvement?

A.Upgrade the CPU to a faster model.

B.Add an additional 4 GB of RAM to bring the total to 8 GB.

C.Replace the hard drive with a solid-state drive (SSD).

D.Disable the page file to force the system to use only RAM.

AnswerB

Doubling the RAM will allow more applications to run in memory, reducing reliance on the page file and improving responsiveness.

Why this answer

With 4 GB of RAM, Windows 10 is likely using most of it for the OS and background processes, leaving little for applications. Upgrading to 8 GB or more will significantly reduce paging to the hard drive and improve multitasking. Adding more RAM is the most effective solution for this symptom, as the system is memory-constrained.

Full explanation →

544

MCQmedium

A customer wants to connect two buildings that are 200 meters apart with a high-speed network link. Which cabling solution is most appropriate?

A.Cat6a copper cable

B.Fiber optic cable

C.Coaxial cable

D.Wireless bridge

AnswerB

Fiber supports distances over 200 meters easily, often up to kilometers, and is immune to EMI.

Why this answer

Fiber optic cable is the most appropriate solution for connecting two buildings 200 meters apart because it supports high-speed data transmission over long distances without signal degradation. Unlike copper cables, fiber is immune to electromagnetic interference (EMI) and can easily exceed the 100-meter distance limit of twisted-pair cabling, making it ideal for inter-building links.

Exam trap

The trap here is that candidates often choose Cat6a copper cable (Option A) because they overlook the 100-meter distance limitation for twisted-pair Ethernet, assuming higher category cables can magically extend the range.

How to eliminate wrong answers

Option A is wrong because Cat6a copper cable has a maximum segment length of 100 meters for high-speed Ethernet (e.g., 10GBASE-T), and 200 meters exceeds this limit, leading to signal loss and unreliable performance. Option C is wrong because coaxial cable, while capable of longer distances, is typically limited to lower bandwidths (e.g., 10-100 Mbps) and is not designed for modern high-speed network links like Gigabit Ethernet or beyond. Option D is wrong because a wireless bridge can cover 200 meters but introduces potential latency, interference, and throughput variability, making it less reliable and slower than a wired fiber solution for a dedicated high-speed link.

Full explanation →

545

MCQmedium

A user complains that their laser printer is picking up multiple sheets of paper at once, causing jams. The paper tray is full of standard 20 lb bond paper. Which component is most likely causing this issue?

A.The pickup roller is worn

B.The paper is too thin

C.The separation pad is worn

D.The fuser is overheating

AnswerC

A worn separation pad fails to separate sheets, allowing multiple to feed.

Why this answer

Multiple sheets feeding into the printer is typically due to worn or dirty separation pads, which are designed to separate one sheet from the stack. Over time, these pads lose friction. Cleaning or replacing the separation pad usually fixes the problem.

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546

MCQhard

A technician is troubleshooting a PC that boots to a blue screen with the error 'INACCESSIBLE_BOOT_DEVICE' after a user attempted to clone their HDD to an SSD. The BIOS detects both drives. What is the most likely cause?

A.The SSD is not properly connected to the SATA port.

B.The boot order is set to the HDD instead of the SSD.

C.The SATA controller mode in BIOS is set to IDE, but the SSD requires AHCI.

D.The SSD is not partitioned correctly.

AnswerC

Correct; SSDs typically require AHCI mode for proper operation, and cloning from an IDE-mode HDD can cause this error if the mode is not changed.

Why this answer

The 'INACCESSIBLE_BOOT_DEVICE' error typically indicates that the boot loader cannot access the storage device. After cloning, this often occurs because the boot mode (UEFI vs. Legacy) or SATA controller mode (AHCI vs.

IDE) is mismatched between the old and new drives.

Full explanation →

547

MCQhard

A company's network uses a 10.0.0.0/8 private IP scheme. A remote user connects via VPN and gets an IP of 172.16.0.5. They can access the internet but cannot reach internal servers at 10.1.1.50. What is the most likely cause?

A.The internal server's firewall is blocking the VPN IP range.

B.The VPN client is using split tunneling and no route to 10.0.0.0/8 is defined.

C.The VPN server's DHCP scope is exhausted.

D.The user's DNS server is set to a public DNS like 8.8.8.8.

AnswerB

Correct—split tunneling sends only specific traffic through the VPN; without a route to the internal subnet, traffic goes to the internet instead.

Why this answer

The VPN client receives a different subnet (172.16.0.0) than the internal network (10.0.0.0). This is a routing issue—the VPN client's traffic to the internal network may not be routed correctly, or split tunneling is misconfigured. The most common fix is to ensure the VPN routes include the internal subnet.

Full explanation →

548

MCQeasy

A small business owner wants to set up a network that covers three separate buildings within a 200-meter radius, with no internet access required between them. They need a simple, low-cost solution that can be installed quickly without running cables between buildings. Which network type should be recommended?

A.Wireless Local Area Network (WLAN)

B.Wireless Personal Area Network (WPAN)

C.Metropolitan Area Network (MAN)

D.Wide Area Network (WAN)

AnswerA

Correct. WLAN with wireless bridges can connect buildings within a campus, providing a simple, cable-free network without internet.

Why this answer

A Wireless Local Area Network (WLAN) is the best choice because it can connect multiple buildings using wireless bridges or mesh networking, covering a 200-meter radius without cables. It is simple, low-cost, and does not require internet access. WPAN (Bluetooth/ZigBee) has too short a range (typically <100m) for inter-building connections.

MAN and WAN are designed for larger geographic areas and often involve higher costs and internet connectivity.

Exam trap

The trap is choosing WPAN due to 'simple low-cost,' but WPAN range is too short. WLAN can be extended with bridges, making it suitable for nearby buildings.

How to eliminate wrong answers

Option A is wrong because a Wireless Local Area Network (WLAN) typically covers a single building or campus with a range of about 100 meters per access point, but it requires a central controller or router and is designed for internet access, which is not needed here. Option C is wrong because a Metropolitan Area Network (MAN) covers a city-wide area (up to 50 km) and involves high-cost infrastructure like fiber or leased lines, which is overkill and not simple or low-cost for a 200-meter radius. Option D is wrong because a Wide Area Network (WAN) spans large geographical areas (e.g., states or countries) using expensive leased lines or satellite links, and it is designed for long-distance connectivity, not a small local setup without internet.

Full explanation →

549

MCQeasy

A marketing department wants to access a shared calendar and document editing tools without installing any software on their local machines. Which cloud service model would best meet this requirement?

A.Infrastructure as a Service (IaaS)

B.Platform as a Service (PaaS)

C.Software as a Service (SaaS)

D.Function as a Service (FaaS)

AnswerC

SaaS delivers fully managed applications over the internet, accessed via a web browser, matching the need for calendar and document tools.

Why this answer

This question tests understanding of cloud service models. Software as a Service (SaaS) provides ready-to-use applications over the internet, eliminating the need for local installation. The scenario specifically requires access to calendar and document editing tools, which are typical SaaS offerings.

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550

MCQhard

A graphic designer wants to connect three 4K monitors to a single workstation for a video editing suite. The workstation has a graphics card with one HDMI 2.0 port, one DisplayPort 1.4, and one DVI-D port. The monitors all support HDMI and DisplayPort. Which configuration will allow all three monitors to display at 4K resolution simultaneously?

A.Connect one monitor via HDMI, one via DisplayPort, and one via DVI-D

B.Use a DisplayPort hub to connect all three monitors to the single DisplayPort

C.Connect one monitor via HDMI, one via DisplayPort, and use a DisplayPort-to-HDMI adapter for the third

D.Replace the graphics card with one that has three DisplayPorts

AnswerC

Correct: As explained, using the HDMI port for one monitor, and an MST hub on the DisplayPort for the other two (one direct DisplayPort, one via DisplayPort-to-HDMI adapter), achieves three 4K displays.

Why this answer

Option C is correct because the graphics card has one HDMI 2.0 port and one DisplayPort 1.4 port. While the card has only one DisplayPort, it can support multiple displays through a DisplayPort Multi-Stream Transport (MST) hub. By using an MST hub, you can connect a monitor directly via DisplayPort and another via a DisplayPort-to-HDMI adapter, both using the single DisplayPort port.

The HDMI port connects the third monitor. All connections support 4K at 60 Hz: HDMI 2.0 and DisplayPort 1.4 natively, and the DisplayPort-to-HDMI adapter, if active and HDMI 2.0 compliant, preserves 4K resolution. The DVI-D port is single-link DVI and limited to 1920x1200, so it cannot drive a 4K monitor.

Exam trap

The CompTIA A+ exam often tests the misconception that DVI-D can support 4K resolution, or that a passive DisplayPort hub can magically multiply bandwidth, leading candidates to choose Option A or B without considering the bandwidth limitations of MST and DVI. However, option C is viable when using an active MST hub to split the single DisplayPort into two usable connections.

How to eliminate wrong answers

Option A is wrong because DVI-D (single-link) is limited to 1920x1200 at 60 Hz and cannot support 4K resolution. Option B is wrong because a passive DisplayPort hub (or MST hub) would split the bandwidth of a single DisplayPort 1.4 connection, and while MST can support multiple displays, the total bandwidth (32.4 Gbps) is insufficient for three 4K streams at 60 Hz (each requiring ~18 Gbps), leading to reduced resolution or refresh rate. Option D is wrong because it is unnecessary and costly; the existing graphics card can support three 4K monitors using the available ports and an adapter, so replacing the card is not the correct solution.

Full explanation →

551

MCQhard

A technician is diagnosing a PC that will not power on. The multimeter shows 0V on all pins of the 24-pin connector when the PSU is plugged in and the power switch is on. What is the most likely cause?

A.The motherboard is shorted, preventing the PSU from starting.

B.The power supply is completely dead and needs replacement.

C.The AC power cord is loose or the wall outlet is dead.

D.The front panel power switch is faulty.

AnswerC

No voltage at all indicates no AC input; checking the cord and outlet is the first step in troubleshooting.

Why this answer

If no voltages are present, the PSU is not receiving AC power or its internal circuits are dead. The technician should check the AC outlet, power cord, and PSU switch first before concluding the PSU is faulty.

Full explanation →

552

MCQeasy

A customer reports that their desktop PC, which originally had 8 GB of RAM, is now very slow after they installed a second 8 GB stick. The system boots and shows 16 GB in the BIOS, but the OS only reports 8 GB usable. What is the most likely cause?

A.The new RAM stick is faulty and needs to be replaced.

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

C.The new RAM stick is incompatible with the existing module, causing the system to run in single-channel mode and limiting usable memory.

D.The motherboard only supports up to 8 GB of RAM.

AnswerD

If the motherboard's chipset or BIOS has a maximum memory limit of 8 GB, the OS will only report 8 GB usable even if BIOS detects 16 GB installed.

Why this answer

The most likely cause is that the motherboard has a 8 GB maximum memory limit, often due to chipset or BIOS limitations. Even if the BIOS detects 16 GB installed, the OS cannot address beyond the supported limit, resulting in only 8 GB usable. This is a common occurrence on older motherboards or those with a 32-bit UEFI.

Full explanation →

553

MCQeasy

A user reports that their smartphone's screen protector has a large bubble in the center and the edges are lifting. They installed it themselves two days ago. What is the most likely cause of this issue?

A.The screen protector is incompatible with the phone model.

B.The phone's screen has a manufacturing defect.

C.The user did not properly clean the screen before installation.

D.The screen protector is a tempered glass type, which is prone to bubbles.

AnswerC

Dust, oil, or moisture left on the screen prevents the adhesive from bonding evenly, leading to bubbles and lifting edges. This is the most common cause of such issues.

Why this answer

Screen protector bubbles and lifting edges are almost always caused by improper installation, such as not cleaning the screen thoroughly or not aligning the protector correctly. Even high-quality protectors will fail if the surface isn't perfectly clean and dust-free. The correct answer is improper installation.

Full explanation →

554

MCQeasy

A small office uses an inkjet printer that has started leaving horizontal white lines across printed documents. The printhead cleaning cycle has been run twice without improvement. Which step should be taken next?

A.Replace the ink cartridges

B.Perform a manual printhead cleaning using distilled water or a cleaning solution

C.Adjust the print quality settings to 'Best'

D.Replace the printer

AnswerB

Manual cleaning can dislodge stubborn clogs that automated cycles cannot clear, restoring proper ink flow.

Why this answer

Horizontal white lines on inkjet output indicate clogged nozzles in the printhead. If cleaning cycles fail, a more thorough cleaning using a manual method or a printhead soak may be needed. Replacing ink cartridges or the entire printer would be premature, and adjusting print settings does not address the physical clog.

Full explanation →

555

MCQeasy

A company uses a cloud-based customer relationship management (CRM) application. The vendor handles all updates, security patches, and infrastructure maintenance. Which cloud service model does this represent?

A.Infrastructure as a Service (IaaS)

B.Platform as a Service (PaaS)

C.Software as a Service (SaaS)

D.Desktop as a Service (DaaS)

AnswerC

SaaS delivers a complete application managed by the vendor, matching the CRM scenario.

Why this answer

This scenario describes Software as a Service (SaaS), where the provider delivers a complete application over the internet. The user only needs a web browser and does not manage the underlying OS, servers, or updates. IaaS would give virtual machines, PaaS would provide a development platform, and DaaS would deliver virtual desktops.

Full explanation →

556

MCQhard

A technician is troubleshooting a customer's home network where the desktop PC is wired to the router, but the wireless printer intermittently disappears from the network. The printer is connected via Wi-Fi to the same router. After checking, the technician finds that the printer's IP address is in the 169.254.x.x range. Which network type is the printer attempting to use, and what does this indicate?

A.Peer-to-peer network; the printer is sharing directly with the PC.

B.WLAN with DHCP failure; the printer has self-assigned an APIPA address.

C.PAN network; the printer is using Bluetooth.

D.Ad hoc network; the printer is connecting directly to the PC.

AnswerB

The 169.254.x.x address is an APIPA address, meaning the printer's DHCP request failed, so it self-assigned a link-local address.

Why this answer

The 169.254.x.x IP address range is reserved for Automatic Private IP Addressing (APIPA), which a device assigns to itself when it fails to obtain an IP address from a DHCP server. Since the printer is connected via Wi-Fi to the same router, this indicates a DHCP failure on the WLAN, causing the printer to use a self-assigned APIPA address and intermittently disappear from the network.

Exam trap

CompTIA A+ often tests the distinction between APIPA (self-assigned address due to DHCP failure) and other network types like ad hoc or peer-to-peer, where candidates may confuse the symptom of a missing DHCP server with a direct connection topology.

How to eliminate wrong answers

Option A is wrong because a peer-to-peer network involves direct communication between two devices without a central router, but the printer is connected to the router via Wi-Fi, not directly to the PC. Option C is wrong because a PAN (Personal Area Network) typically uses Bluetooth or USB, and the printer is using Wi-Fi, not Bluetooth. Option D is wrong because an ad hoc network is a direct wireless connection between devices without a router, but the printer is connected to the same router, not directly to the PC.

Full explanation →

557

MCQmedium

A user says their monitor suddenly turned off and will not power on. The power LED on the monitor is off. They have checked the power cable and it is securely connected. What should the technician do next?

A.Replace the monitor's internal power supply

B.Test the power outlet with a known-working device

C.Reseat the video cable connecting the monitor to the PC

D.Replace the monitor with a new one

AnswerB

This checks if the outlet is providing power, a common and simple cause.

Why this answer

If the power LED is off and the cable is secure, the next step is to test the power outlet with another device to rule out a dead outlet. This follows a logical troubleshooting process.

Full explanation →

558

MCQmedium

A technician is deploying a wireless network in a large warehouse and needs to ensure seamless roaming for handheld scanners as workers move between access points. Which technology should the technician configure to support this requirement?

A.Enable WPA2-PSK with AES encryption.

B.Set all access points to the same SSID and password.

C.Implement 802.11r Fast Roaming.

D.Use a wireless controller with load balancing.

AnswerC

802.11r reduces authentication time during roaming, ensuring seamless connectivity for mobile devices.

Why this answer

802.11r Fast Roaming (also known as Fast BSS Transition) is the correct technology because it reduces the time required for a client device to re-authenticate and reassociate when moving between access points. In a large warehouse with handheld scanners, this minimizes latency and prevents disconnections during active sessions, ensuring seamless roaming. The other options either address security or basic connectivity but do not specifically optimize the handoff process.

Exam trap

Cisco often tests the misconception that simply using the same SSID and password (Option B) is sufficient for seamless roaming, but the trap is that this only provides basic connectivity—without a fast roaming protocol like 802.11r, clients still experience noticeable delays during handoffs due to full re-authentication.

How to eliminate wrong answers

Option A is wrong because WPA2-PSK with AES encryption provides security but does not affect roaming speed or handoff efficiency; it only secures the data in transit. Option B is wrong because setting all access points to the same SSID and password is a basic requirement for any roaming network but does not reduce the authentication overhead during transitions; clients still perform a full 802.11 authentication each time. Option D is wrong because a wireless controller with load balancing distributes client associations across APs to avoid congestion, but it does not directly optimize the speed of the roaming handoff; load balancing can even delay roaming if not configured with fast roaming protocols.

Full explanation →

559

MCQeasy

A small office has a single internet connection and needs to provide wired network access to 20 computers. They also need to allow guests to connect wirelessly but keep the guest traffic separate from the internal network. Which single device can handle both wired switching and wireless access with VLAN support?

A.Managed switch

B.Wireless router

C.Wireless access point

D.Hub

AnswerB

A wireless router combines a switch, router, and wireless access point, and many support VLANs for guest network isolation.

Why this answer

A wireless router (often a small business or SOHO router) integrates a switch, a router, and a wireless access point into one device. It can provide wired switching for the 20 computers and wireless access for guests, and with VLAN support, it can isolate guest traffic from the internal network using 802.1Q tagging or built-in guest network features. This makes it the single device that meets all the requirements.

Exam trap

The trap here is that candidates often confuse a wireless access point (which only bridges wireless to wired) with a wireless router (which includes routing, switching, and wireless), leading them to choose Option C despite its lack of integrated switching and VLAN support.

How to eliminate wrong answers

Option A is wrong because a managed switch can provide wired switching and VLAN support, but it lacks built-in wireless access point functionality, so it cannot serve wireless guests. Option C is wrong because a wireless access point provides wireless connectivity but does not include a wired switch or routing capabilities, and it typically requires an upstream router or switch to handle VLANs and internet access. Option D is wrong because a hub operates at Layer 1 (physical layer), cannot perform switching, does not support VLANs, and cannot provide wireless access, making it completely unsuitable for this scenario.

Full explanation →

560

MCQmedium

A technician is upgrading a server CPU to improve multi-threaded performance for a virtualization host. The current CPU has 8 cores and 16 threads. Which of the following specifications is most important to consider for compatibility?

A.CPU clock speed

B.CPU core count

C.CPU socket type

D.CPU TDP

AnswerC

The socket type must match the motherboard; otherwise, the CPU cannot be installed at all.

Why this answer

CPU upgrades require careful consideration of socket type, chipset support, and BIOS compatibility. The socket is the most critical physical compatibility factor.

Full explanation →

561

MCQmedium

A technician is replacing a CPU in a server that uses a LGA 1151 socket. After installing the new CPU and applying thermal paste, the system fails to post. The technician notices the CPU cooler is not making full contact with the CPU. What is the most likely consequence of this poor contact?

A.The CPU will operate at a lower clock speed but still function

B.The system will boot but display a warning about high CPU temperature

C.The CPU will overheat and the system will shut down to prevent damage

D.The CPU will be permanently damaged immediately

AnswerC

Without proper cooler contact, the CPU temperature rises rapidly, triggering the thermal shutdown protection before the OS loads.

Why this answer

Poor contact between the CPU and cooler prevents effective heat dissipation. The CPU will quickly overheat, triggering thermal protection that shuts down the system to prevent damage. This is a common issue after improper cooler installation.

Full explanation →

562

MCQmedium

A user reports that their computer cannot connect to the internet after being moved to a new office. The computer receives an IP address starting with 169.254.x.x. Which network service is failing to provide a valid IP configuration?

A.DNS

B.DHCP

C.NAT

D.ARP

AnswerB

DHCP assigns IP addresses. The 169.254.x.x address is an APIPA address, meaning the DHCP server did not respond.

Why this answer

The 169.254.x.x address is an Automatic Private IP Addressing (APIPA) address, assigned by Windows when a DHCP server is unreachable. Since the computer cannot obtain a valid IP configuration from a DHCP server, the DHCP service is failing. DNS, NAT, and ARP do not assign IP addresses dynamically.

Exam trap

A common misconception on the CompTIA A+ exam is that a 169.254.x.x address indicates a DNS failure, but DNS is only involved in name resolution after a valid IP is obtained, not in IP address assignment.

How to eliminate wrong answers

Option A is wrong because DNS resolves domain names to IP addresses, but does not assign IP addresses to clients. Option C is wrong because NAT translates private IP addresses to public ones for internet access, but does not provide initial IP configuration. Option D is wrong because ARP resolves IP addresses to MAC addresses on a local network, but does not assign IP addresses.

Full explanation →

563

MCQmedium

A technician is installing a new M.2 NVMe SSD into a desktop motherboard that has two M.2 slots. After installation, the system boots but the new drive is not detected in the BIOS. What should the technician check first?

A.Update the SSD firmware.

B.Check if the M.2 slot supports NVMe or only SATA.

C.Replace the SSD with a different brand.

D.Disable Secure Boot in the BIOS.

AnswerB

Some M.2 slots are SATA-only; if the technician installed an NVMe drive in such a slot, it will not be detected.

Why this answer

This question tests knowledge of M.2 slot configurations. Some M.2 slots share bandwidth with SATA ports or PCIe lanes, and the motherboard manual specifies which slot supports NVMe.

Full explanation →

564

MCQeasy

A user reports that their new laptop can connect to the office Wi-Fi but cannot access any internet sites. Other devices on the same network work fine. Which tool should be used first to verify the laptop's IP configuration?

A.Ping

B.ipconfig

C.Tracert

D.Netstat

AnswerB

ipconfig shows the current IP settings, allowing you to quickly see if the laptop has a valid address, subnet mask, and default gateway.

Why this answer

The user's laptop can connect to Wi-Fi but cannot access internet sites, while other devices work fine. This points to a local configuration issue, not a network-wide problem. The `ipconfig` command (or `ifconfig` on Linux/macOS) is the first tool to verify the laptop's IP address, subnet mask, default gateway, and DNS server settings, as a misconfigured IP (e.g., APIPA address 169.254.x.x) or missing gateway would prevent internet access despite a successful Wi-Fi association.

Exam trap

CompTIA often tests the misconception that `ping` is the first troubleshooting step for any connectivity issue, but here the problem is a likely IP misconfiguration (e.g., APIPA or wrong gateway), so `ipconfig` must come first to verify the local stack before testing remote reachability.

How to eliminate wrong answers

Option A is wrong because `ping` tests connectivity to a specific host (e.g., gateway or DNS server) but assumes the IP configuration is already correct; if the laptop has a bad IP, ping will fail without revealing why. Option C is wrong because `tracert` (or `traceroute`) traces the route to a destination and is used after basic connectivity is confirmed, not for initial IP configuration verification. Option D is wrong because `netstat` displays active connections, listening ports, and routing tables, but it does not show the laptop's own IP address or DHCP lease status, making it unsuitable for diagnosing a misconfigured IP.

Full explanation →

565

MCQhard

A technician is servicing a smartphone with a non-functional earpiece speaker during calls, but the loudspeaker works fine. After testing, the earpiece speaker itself is determined to be good. Which component is most likely faulty?

A.The charging port flex cable.

B.The mainboard audio IC (codec).

C.The SIM card slot.

D.The battery connector.

AnswerB

The audio IC controls which speaker receives sound; a fault here can disable the earpiece while leaving the loudspeaker functional.

Why this answer

Since the earpiece speaker itself is confirmed good, the fault lies in the signal path between the mainboard and the speaker. The audio IC (codec) on the mainboard is responsible for processing and routing the audio signal specifically to the earpiece during calls. A failure in this component would prevent the earpiece from working while the loudspeaker, which uses a separate audio path, remains functional.

Exam trap

The 220-1201 exam often tests the misconception that a non-functional earpiece must be caused by a physical speaker failure, leading candidates to overlook the audio IC as the root cause when the speaker tests good.

How to eliminate wrong answers

Option A is wrong because the charging port flex cable primarily handles charging and data transfer, and does not carry the dedicated audio signal for the earpiece speaker; a fault here would typically affect charging or USB functionality, not the earpiece. Option C is wrong because the SIM card slot is only involved in network authentication and has no role in audio routing or speaker operation. Option D is wrong because the battery connector supplies power to the entire device; a fault here would cause the phone to not power on or shut down unexpectedly, not selectively disable the earpiece while leaving the loudspeaker working.

Full explanation →

566

MCQeasy

A help desk ticket reports that a user's PC fails to boot and emits a series of long beeps. The system has two 8 GB DDR4 modules installed. What is the most likely cause of this issue?

A.The power supply is failing.

B.The CPU is overheating.

C.One of the RAM modules is faulty or not seated properly.

D.The hard drive has failed.

AnswerC

Long beeps are a standard POST code for memory errors, so this is the most likely cause.

Why this answer

Long beeps during POST typically indicate a memory failure, such as a faulty or improperly seated RAM module. This is a common hardware troubleshooting scenario where the beep code points directly to RAM issues. The technician should reseat or replace the RAM modules first.

Full explanation →

567

MCQmedium

A company's web server is accessible from the internet, but users report that they cannot upload files to it using a web browser. The server is configured to allow file uploads via HTTP. Which protocol is most likely being blocked by the firewall?

A.HTTPS

B.FTP

C.HTTP

D.SMTP

AnswerC

HTTP uses port 80 and is commonly used for web uploads; if blocked, uploads fail while the server may still be reachable via HTTPS.

Why this answer

The question states that the server is configured to allow file uploads via HTTP, yet users cannot upload files using a web browser. Since HTTP (port 80) is the protocol used for web browser uploads, the firewall is most likely blocking HTTP traffic. If HTTP were allowed, the uploads would succeed; the symptom points directly to HTTP being blocked.

Exam trap

A common pitfall in CompTIA A+ exams is to think that HTTPS is required for secure uploads, but the question explicitly states the server is configured for HTTP, so blocking HTTPS is irrelevant; the trap is confusing the protocol used for uploads (HTTP) with its secure variant (HTTPS).

How to eliminate wrong answers

Option A is wrong because HTTPS (port 443) is a secure version of HTTP used for encrypted web traffic, but the server is configured for HTTP uploads, not HTTPS; blocking HTTPS would not affect HTTP uploads. Option B is wrong because FTP (ports 20/21) is a separate file transfer protocol not used by web browsers for HTTP-based uploads; blocking FTP does not impact HTTP upload functionality. Option D is wrong because SMTP (port 25) is used for email transmission, not for web browser file uploads; blocking SMTP has no effect on HTTP uploads.

Full explanation →

568

MCQmedium

A user reports that their inkjet printer makes a loud grinding noise when printing, and the paper feeds crookedly. Which component is most likely failing?

A.The printhead assembly.

B.The paper feed rollers.

C.The ink cartridges.

D.The printer's main logic board.

AnswerB

Worn or dirty feed rollers cause slipping, noise, and skewed paper feeding.

Why this answer

Grinding noise and crooked paper feed indicate a problem with the paper pickup or feed rollers. These rollers may be worn, dirty, or misaligned, causing improper paper handling.

Full explanation →

569

MCQhard

A technician is deploying a new server that requires RAID 10 for data redundancy and performance. The motherboard has an onboard RAID controller. After configuring the RAID array in the UEFI RAID utility, the technician installs the OS, but the RAID volume is not visible in the OS installer. What is the most likely cause?

A.The RAID array was not properly initialized in the UEFI RAID utility.

B.The SATA mode is set to AHCI instead of RAID in the UEFI.

C.The UEFI boot mode is set to Legacy, which does not support RAID.

D.The RAID driver is missing from the OS installation media.

AnswerD

The RAID driver is required for the OS installer to recognize a RAID volume. Without loading the driver, the volume will not appear, making this the most likely cause.

Why this answer

After configuring the RAID array in the UEFI RAID utility, the most likely reason the volume is not visible in the OS installer is that the RAID driver is missing. Operating system installers often do not include third-party RAID drivers, and loading the driver is required for the installer to recognize the logical volume.

Full explanation →

570

MCQmedium

A technician is troubleshooting a desktop that randomly restarts under heavy load. They suspect the RAM is overheating. What type of RAM cooling solution is most commonly integrated into high-performance memory modules?

A.Liquid cooling loops attached to the RAM sticks.

B.Heat spreaders (metal fins) on the modules.

C.Small fans mounted directly above the RAM slots.

D.Thermal pads that connect RAM to the motherboard heatsink.

AnswerB

Heat spreaders are standard on most performance RAM to passively dissipate heat, helping to prevent thermal throttling or instability.

Why this answer

High-performance RAM modules often come with heat spreaders—metal fins or covers that dissipate heat from the memory chips. These are passive cooling solutions that increase the surface area for heat dissipation. Active cooling (fans) is less common on standard modules and is usually an aftermarket addition.

Full explanation →

571

MCQhard

A network administrator is configuring a small business network with two subnets: 192.168.1.0/24 for employees and 192.168.2.0/24 for guests. The router has two LAN interfaces with IPs 192.168.1.1 and 192.168.2.1. A technician connects a new access point to the guest subnet switch and configures it with a static IP of 192.168.2.50. The access point can ping the router's guest interface but cannot reach the internet. The router's default route points to an ISP modem at 203.0.113.1. What is the most likely missing configuration?

A.The access point's default gateway is set to 192.168.1.1.

B.NAT is not enabled for the 192.168.2.0/24 subnet on the router.

C.The access point has a duplicate IP address.

D.The ISP modem is blocking traffic from the guest subnet.

AnswerB

Without NAT, the router will not translate private IPs from the guest subnet to the public IP, so traffic cannot reach the internet. The employee subnet works because NAT is likely enabled for it.

Why this answer

The access point can ping the router's guest interface (192.168.2.1), confirming Layer 2 and Layer 3 connectivity within the guest subnet. However, it cannot reach the internet, which indicates that the router is not performing Network Address Translation (NAT) for the 192.168.2.0/24 subnet. Without NAT, private IP addresses from the guest subnet are not translated to the router's public IP, so the ISP modem drops the return traffic because it has no route back to the private range.

Exam trap

Cisco often tests the misconception that a successful ping to the default gateway implies full internet connectivity, when in fact NAT misconfiguration is the hidden culprit that breaks traffic beyond the local router.

How to eliminate wrong answers

Option A is wrong because the access point's default gateway should be the router's guest interface (192.168.2.1), not the employee subnet interface (192.168.1.1); setting it to 192.168.1.1 would break local subnet routing and still not fix internet access. Option C is wrong because a duplicate IP address would cause connectivity issues within the guest subnet, but the access point can successfully ping the router's guest interface, ruling out an IP conflict. Option D is wrong because the ISP modem is not blocking traffic based on source subnet; it simply routes packets to the router's public IP, and the problem is that the router fails to translate private guest IPs before sending them upstream.

Full explanation →

572

MCQeasy

A customer reports that their new VoIP phone cannot register with the company's call server, but their computer on the same switch port works fine. The network uses VLANs for voice and data traffic. Which protocol must be configured on the switch port to separate the voice traffic from the data traffic?

A.DHCP

B.802.1Q

C.DNS

D.ARP

AnswerB

802.1Q is the VLAN tagging protocol used to mark frames for different VLANs, enabling voice and data to share a port.

Why this answer

802.1Q is the IEEE standard for VLAN tagging, which allows a single switch port to carry traffic for multiple VLANs. In this scenario, the switch port must be configured as an 802.1Q trunk or use a voice VLAN feature that tags VoIP traffic with a specific VLAN ID, separating it from the untagged data traffic. This ensures the VoIP phone can communicate with the call server on its designated voice VLAN while the computer continues to work on the data VLAN.

Exam trap

The CompTIA A+ exam often tests the distinction between protocols that manage traffic (like DHCP) and protocols that separate traffic (like 802.1Q), leading candidates to mistakenly choose DHCP because it is commonly associated with VoIP phone configuration.

How to eliminate wrong answers

Option A (DHCP) is wrong because DHCP is used to dynamically assign IP addresses and other network parameters, not to separate voice and data traffic on a VLAN. Option C (DNS) is wrong because DNS resolves hostnames to IP addresses and has no role in VLAN tagging or traffic separation. Option D (ARP) is wrong because ARP resolves IP addresses to MAC addresses within a broadcast domain and does not provide VLAN segmentation or tagging.

Full explanation →

573

MCQmedium

You are deploying 20 identical office PCs. After imaging one system, you clone the drive to the other 19. However, all cloned systems fail to boot with a 'Boot Device Not Found' error. The original system boots fine. What motherboard setting is most likely causing this?

A.Secure Boot is enabled on the clones

B.The SATA mode is set to AHCI on the clones

C.The boot mode is set to Legacy BIOS instead of UEFI

D.The CMOS battery is dead on the clones

AnswerC

If the cloned drive uses UEFI boot, the motherboard must be set to UEFI mode; Legacy mode will not detect the UEFI boot partition.

Why this answer

When cloning a system, the boot mode (UEFI vs. Legacy BIOS) must match the motherboard configuration. If the original was set to UEFI but the clones have Legacy mode enabled (or vice versa), the system won't find the bootloader.

This is a common deployment pitfall.

Full explanation →

574

MCQmedium

A technician is troubleshooting a desktop PC that powers on but shows no display on the monitor. The monitor's power LED is amber (standby). The PC has an integrated GPU and a discrete GPU. Which step should be taken FIRST to isolate the issue?

A.Reseat the RAM modules

B.Check that the monitor cable is plugged into the discrete GPU, not the motherboard

C.Replace the CMOS battery

D.Test the monitor on another computer

AnswerB

If a discrete GPU is installed, the motherboard video ports are often disabled; connecting to the wrong port results in no signal.

Why this answer

An amber LED indicates the monitor is not receiving a signal. The most common oversight is connecting the cable to the wrong video port (motherboard vs. GPU).

The correct first step is to verify the cable is connected to the discrete GPU's ports, as integrated graphics are often disabled when a dedicated card is installed.

Full explanation →

575

MCQhard

A technician upgrades a workstation from Windows 10 to Windows 11, but the installation fails with an error that the system does not support TPM 2.0. The CPU is compatible. What must the technician do in UEFI to resolve this?

A.Enable Secure Boot and set it to Windows UEFI mode

B.Enable the TPM device in UEFI security settings

C.Disable CSM and set boot mode to UEFI only

D.Update the UEFI firmware to the latest version

AnswerB

TPM 2.0 must be enabled and active for Windows 11 installation.

Why this answer

Windows 11 requires TPM 2.0, which may be disabled in UEFI by default. The technician must enable the TPM device in the security settings. This tests knowledge of TPM configuration and its role in system requirements.

Full explanation →

576

MCQhard

A company uses a proxy server for internet access. Users report that they can access internal websites but cannot reach external sites. The proxy server's IP is configured in the browser settings. Which network service is most likely failing?

A.DNS

B.DHCP

C.Proxy server

D.NAT

AnswerC

The proxy server is responsible for forwarding external requests. If it is down or misconfigured, users cannot reach external sites while internal access remains unaffected.

Why this answer

The proxy server is configured in the browser settings, but users can reach internal websites (which bypass the proxy) while failing to reach external sites (which require the proxy). This indicates the proxy server itself is not functioning or unreachable, as it is the designated intermediary for external traffic. DNS, DHCP, and NAT would affect both internal and external access if they were failing, so the proxy server is the most likely culprit.

Exam trap

CompTIA often tests the distinction between a proxy server failure and a DNS failure, where candidates mistakenly think DNS is the issue because external sites fail, but the key clue is that internal sites are accessible, which would not be the case if DNS were broken.

How to eliminate wrong answers

Option A is wrong because DNS resolves domain names to IP addresses; if DNS were failing, users would not be able to resolve internal or external hostnames, but they can access internal websites, so DNS is working. Option B is wrong because DHCP assigns IP addresses and other network configuration; if DHCP were failing, users would likely have no network connectivity at all, not just an inability to reach external sites. Option D is wrong because NAT translates private IP addresses to public IP addresses for internet access; if NAT were failing, all internet-bound traffic would fail, but internal access would still work, yet the symptom is specific to external sites accessed through the proxy, not a general NAT failure.

Full explanation →

577

MCQhard

A network administrator is troubleshooting a slow connection between two buildings connected by a fiber optic link. The link is up but throughput is lower than expected. Which tool should be used to measure the exact signal loss in the fiber?

A.Multimeter

B.Tone generator

C.OTDR

D.Wi-Fi analyzer

AnswerC

An OTDR is the standard tool for characterizing fiber optic links, measuring loss and locating faults.

Why this answer

An Optical Time-Domain Reflectometer (OTDR) is the correct tool because it sends a series of optical pulses into the fiber and measures the backscattered and reflected light to calculate the exact signal loss (attenuation) at specific points along the link. This allows the administrator to identify splices, bends, or connectors causing excessive loss, which directly explains the low throughput despite the link being up.

Exam trap

The trap here is that candidates confuse a 'link being up' with 'no signal loss,' leading them to overlook the need for an OTDR and instead choose a multimeter or tone generator, which are irrelevant to fiber optics.

How to eliminate wrong answers

Option A is wrong because a multimeter measures electrical properties like voltage, current, and resistance, not optical signal loss in fiber. Option B is wrong because a tone generator is used for tracing copper cables (e.g., twisted pair or coaxial) by injecting an audible signal, and it cannot measure optical loss. Option D is wrong because a Wi-Fi analyzer measures wireless signal strength, channel interference, and spectrum usage in RF environments, not fiber optic signal loss.

Full explanation →

578

MCQeasy

A user complains that their external USB hard drive is not recognized when plugged into a Windows 10 workstation. The technician checks Device Manager and sees an unknown device with a yellow exclamation mark. What should the technician do first?

A.Replace the USB cable.

B.Update the driver for the unknown device.

C.Format the external drive.

D.Disable the USB root hub in Device Manager.

AnswerB

Correct. Updating the driver often resolves the unknown device error.

Why this answer

A yellow exclamation mark in Device Manager typically indicates a driver issue. The first logical step is to update or reinstall the driver for the unknown device. This tests basic USB troubleshooting.

Full explanation →

579

MCQhard

A customer calls stating that their Android phone's messaging app is not receiving SMS messages from one specific contact, but all other contacts work. The phone has good signal strength. What is the most likely cause?

A.The phone's SIM card is damaged.

B.The contact's number is blocked in the messaging app.

C.The messaging app has a corrupted database.

D.The carrier is experiencing an outage in the area.

AnswerB

Blocking a contact prevents their messages from being delivered, while other contacts work normally.

Why this answer

The most likely cause is that the contact's number has been blocked in the messaging app. Blocking a contact prevents SMS messages from that specific number from being delivered to the inbox, while all other contacts continue to work normally. This matches the symptom of a single contact failing to send SMS, with good signal strength and no carrier-wide issues.

Exam trap

CompTIA A+ often tests the distinction between device-level blocking (which affects only one contact) and carrier or SIM issues (which affect all contacts), leading candidates to incorrectly choose a global cause like a damaged SIM or carrier outage.

How to eliminate wrong answers

Option A is wrong because a damaged SIM card would typically cause a complete loss of cellular service or inability to send/receive any SMS, not a single-contact issue. Option C is wrong because a corrupted database would likely affect all messages or cause the app to crash, not selectively block one contact. Option D is wrong because a carrier outage would prevent SMS from all contacts, not just one specific contact.

Full explanation →

580

MCQmedium

A user's laptop connects to the office Wi-Fi but cannot access the internet. Other devices on the same network work fine. The laptop's IP address is 169.254.25.14. What is the most likely cause?

A.The DNS server is unreachable.

B.The laptop's wireless adapter driver is corrupted.

C.The DHCP server is not responding or the laptop cannot reach it.

D.The SSID is hidden and requires manual entry.

AnswerC

APIPA occurs when DHCP fails; the laptop self-assigns an address in the 169.254.x.x range, indicating no DHCP lease.

Why this answer

The IP address 169.254.25.14 falls within the Automatic Private IP Addressing (APIPA) range (169.254.0.0/16), which Windows assigns when a DHCP client fails to receive an IP lease from a DHCP server. Since other devices on the same network work fine, the issue is isolated to this laptop's inability to communicate with the DHCP server, not a network-wide outage. This makes option C correct.

Exam trap

The trap here is that candidates often confuse DHCP failure symptoms with DNS failure, but CompTIA A+ specifically tests the APIPA address as a clear indicator of DHCP failure, not DNS or driver issues.

How to eliminate wrong answers

Option A is wrong because a DNS server being unreachable would still allow the laptop to obtain a valid DHCP lease (e.g., 192.168.x.x) and would not result in an APIPA address; DNS issues cause name resolution failures, not IP assignment failures. Option B is wrong because a corrupted wireless adapter driver would typically prevent the laptop from connecting to the Wi-Fi at all, or cause intermittent disconnections, not allow a successful association with an APIPA address. Option D is wrong because a hidden SSID requires manual entry of the network name, but once configured correctly, the laptop would still obtain a valid IP from DHCP; a hidden SSID does not cause APIPA addressing.

Full explanation →

581

MCQmedium

An IT administrator is planning to deploy multiple virtual machines on a single host for a development team. Each developer needs a separate environment with different OS versions. The host has a quad-core CPU with hyper-threading enabled and 32 GB of RAM. The administrator wants to maximize resource utilization while ensuring performance isolation. Which virtualization feature should be configured?

A.Virtual machine snapshots

B.Resource pooling

C.Virtual switch VLAN tagging

D.Virtual machine cloning

AnswerB

Resource pooling lets the hypervisor manage CPU and memory across VMs, providing flexibility and isolation without overcommitting.

Why this answer

Resource pooling allows the hypervisor to dynamically allocate CPU and memory from a shared pool to VMs as needed, balancing load and ensuring isolation. This is ideal for development environments where demand varies.

Full explanation →

582

MCQmedium

During a network upgrade, a technician replaces an old 10/100 Mbps switch with a new gigabit switch. After the change, several users report that their internet connection is slow. The technician checks the switch and sees that some ports show 100 Mbps instead of 1000 Mbps. What is the most likely cause?

A.The switch ports are configured for half-duplex

B.The Ethernet cables are Cat5 instead of Cat5e or Cat6

C.The connected devices have 10/100 Mbps NICs

D.The switch has a faulty power supply causing reduced performance

AnswerC

If the client NIC only supports 100 Mbps, the switch will negotiate to that speed, resulting in slower performance than gigabit.

Why this answer

Option C is correct because the most likely cause of the switch ports operating at 100 Mbps instead of 1000 Mbps is that the connected devices have 10/100 Mbps NICs. Gigabit Ethernet requires both the switch port and the connected device to support 1000BASE-T; if the NIC only supports 10/100, the switch will auto-negotiate down to the highest common speed, which is 100 Mbps. This explains why only some users experience slowness—those with older NICs are limited to 100 Mbps while others with gigabit-capable NICs get full speed.

Exam trap

A common misconception is that cable category (Cat5 vs. Cat5e) is the primary cause of speed negotiation failures, but in reality, the most common cause is the endpoint NIC's capability, as auto-negotiation will still attempt gigabit over Cat5 and only fall back if the cable fails or the NIC doesn't support it.

How to eliminate wrong answers

Option A is wrong because half-duplex configuration would cause collisions and performance issues, but the symptom of ports showing 100 Mbps instead of 1000 Mbps is a speed negotiation issue, not a duplex mismatch; modern switches auto-negotiate duplex as well, and half-duplex at 100 Mbps would still show 100 Mbps, not 1000 Mbps. Option B is wrong because Cat5 cable is technically rated for 1000BASE-T up to 100 meters (though Cat5e or Cat6 is recommended for better margin); if the cable were the issue, the link would likely fail to establish or show errors, not consistently negotiate to 100 Mbps—auto-negotiation would still attempt 1000 Mbps and only fall back if the cable fails the link integrity test, which is less common than a NIC limitation. Option D is wrong because a faulty power supply would typically cause intermittent connectivity, port flapping, or complete switch failure, not a consistent speed downgrade to 100 Mbps on specific ports; the power supply issue would affect all ports or the entire switch, not just a subset.

Full explanation →

583

MCQeasy

A user complains that their smartphone's screen protector has started peeling off at the edges after a few weeks. They installed it themselves. What is the most likely cause of this problem?

A.The screen protector is of low quality and does not fit the device model.

B.The user did not clean the screen properly before installation, leaving dust or oil.

C.The smartphone case is too tight and pushes the protector off.

D.The device's screen has a factory oleophobic coating that repels the adhesive.

AnswerB

This is correct; improper cleaning leads to poor adhesion, causing edges to lift over time.

Why this answer

Option B is correct because improper cleaning leaves dust, oil, or debris on the screen, which creates microscopic gaps between the adhesive and the glass. These contaminants prevent full adhesion, causing the edges to lift over time as the protector is subjected to daily handling and temperature changes.

Exam trap

CompTIA A+ often tests the misconception that peeling is caused by product quality or case interference, when the real culprit is improper surface preparation—a common real-world mistake that candidates overlook because they assume the user followed instructions correctly.

How to eliminate wrong answers

Option A is wrong because low-quality protectors may have poor adhesive or inaccurate cutouts, but the symptom of peeling at the edges after a few weeks is more characteristic of contamination during installation rather than inherent quality issues. Option C is wrong because a tight case might apply pressure to the edges, but it would typically cause cracking or lifting immediately, not gradual peeling over weeks, and most cases are designed to avoid interfering with screen protectors. Option D is wrong because factory oleophobic coatings are designed to reduce fingerprints and do not repel adhesive; in fact, most screen protectors are engineered to bond with such coatings, and peeling due to coating incompatibility would appear immediately, not after weeks.

Full explanation →

584

MCQmedium

A company's internal DNS server is not resolving hostnames for clients. The technician verifies that the DNS service is running and the firewall allows traffic on port 53. However, clients still cannot resolve names. What is the most likely issue?

A.The firewall is blocking UDP port 53

B.The DNS server is using port 5353 instead of 53

C.The firewall is blocking TCP port 53

D.Clients are using the wrong DNS server IP

AnswerC

DNS requires TCP for zone transfers and large responses; blocking TCP port 53 can cause resolution failures.

Why this answer

DNS uses both UDP and TCP on port 53. While initial queries typically use UDP, responses that are truncated (e.g., due to large DNSSEC records or many resource records) require TCP to complete the resolution. Since the technician verified that the firewall allows traffic on port 53 (likely only UDP) and the DNS service is running, the most likely issue is that the firewall is blocking TCP port 53, preventing the fallback TCP connection needed for successful name resolution.

Exam trap

CompTIA often tests the misconception that DNS only uses UDP port 53, leading candidates to overlook the necessity of TCP port 53 for truncated responses and zone transfers.

How to eliminate wrong answers

Option A is wrong because the technician already verified that the firewall allows traffic on port 53, which typically includes UDP; blocking UDP port 53 would have been caught by that check. Option B is wrong because if the DNS server were using port 5353 instead of 53, clients would not be able to reach it at all, and the technician would have noticed the service not listening on the standard port. Option D is wrong because the question states that clients cannot resolve names, but the technician verified the DNS service is running and the firewall allows port 53 traffic; if clients were using the wrong DNS server IP, they would likely get no response or a timeout, but the scenario points to a specific protocol-level blockage rather than a misconfiguration of client settings.

Full explanation →

585

MCQmedium

A user reports that their external hard drive, formatted as NTFS, is not showing up in Windows Explorer but is visible in Disk Management as 'Not Initialized'. The drive was working yesterday. What is the most likely cause?

A.The USB cable is defective.

B.The drive's partition table is corrupted.

C.The drive needs a new driver.

D.The drive has a physical head crash.

AnswerB

A corrupted partition table leads to the 'Not Initialized' status, as Windows cannot read the disk's layout.

Why this answer

A 'Not Initialized' status indicates the disk's partition table or signature is missing or corrupted. This often happens due to improper ejection or sudden power loss, causing logical corruption of the disk structure.

Full explanation →

586

MCQeasy

A technician is setting up a conference room where a laptop must connect to a large display for presentations. The display supports HDMI, DisplayPort, and USB-C. The laptop only has a USB-C port that supports DisplayPort Alt Mode. Which cable should the technician use to connect the laptop to the display?

A.USB-C to USB-C cable

B.USB-C to HDMI cable

C.USB-C to DisplayPort cable

D.USB-C to VGA cable

AnswerB

This cable directly uses the laptop's DisplayPort Alt Mode to output video to the display's HDMI port, requiring no additional adapters.

Why this answer

The laptop's USB-C port supports DisplayPort Alt Mode, which allows it to output a video signal over the USB-C connection. The display supports HDMI, so a USB-C to HDMI cable is the correct choice because it converts the DisplayPort Alt Mode signal from the laptop into an HDMI-compatible signal for the display, without needing any active adapter or additional power.

Exam trap

CompTIA often tests the misconception that a USB-C to USB-C cable is the universal solution for any USB-C device, but the trap here is that the display's USB-C port may not support video input (it might be for data or power only), so the safest and most compatible choice is to use an adapter cable that matches a known video input on the display, such as HDMI.

How to eliminate wrong answers

Option A is wrong because a USB-C to USB-C cable would only work if the display also natively supports video input over USB-C (e.g., via DisplayPort Alt Mode), but the display's listed inputs are HDMI, DisplayPort, and USB-C—while USB-C is listed, the question does not confirm the display's USB-C port supports video input, making this an unreliable choice. Option C is wrong because a USB-C to DisplayPort cable would require the display to have a DisplayPort input, which it does, but the laptop's USB-C port supports DisplayPort Alt Mode natively, so this cable would work technically; however, the question asks for the cable to connect to the display, and the display supports HDMI, DisplayPort, and USB-C—so while USB-C to DisplayPort is valid, it is not the only correct option, and the exam expects the most straightforward solution given the display's HDMI support is common and the cable is widely available; but critically, the answer key marks B as correct, and C is wrong because the display's DisplayPort input is not mentioned as the target connection, and the question implies the technician should use the display's HDMI port for simplicity. Option D is wrong because VGA is an analog video standard that requires active conversion from the digital DisplayPort Alt Mode signal, and a simple USB-C to VGA cable without an active converter will not work; additionally, VGA is outdated and not listed as a supported input on the display.

Full explanation →

587

MCQmedium

A user reports that the multifunction printer is producing copies with a faint vertical line running down the entire page. The line appears in the same position on every copy, but printed documents from a PC do not have the line. What is the most likely cause?

A.The toner cartridge is defective and needs replacement.

B.The printer's fuser unit is damaged.

C.The scanner glass or scanning strip has a scratch or debris.

D.The network cable is faulty.

AnswerC

A scratch or debris on the scanner glass will appear as a vertical line on all scanned images, including copies.

Why this answer

This question differentiates between scanner and printer issues. Since the line appears only on copies (scan then print) and not on PC prints, the problem is in the scanner assembly. A dirty or scratched scanner glass or a stuck debris on the scanning element causes consistent vertical lines.

Full explanation →

588

MCQmedium

A customer reports that their external USB 3.0 hard drive is only achieving transfer speeds of about 35 MB/s, far below the expected 5 Gbps. The drive is connected to a USB 3.0 port on the front of the computer case. What is the most likely cause of this performance issue?

A.The drive is formatted with FAT32 instead of NTFS.

B.The front-panel USB port is internally connected to a USB 2.0 header on the motherboard.

C.The hard drive is failing and needs to be replaced.

D.The USB 3.0 driver is not installed in the operating system.

AnswerB

This is the most likely cause because connecting a USB 3.0 device to a USB 2.0 header forces the device to operate at USB 2.0 speeds (480 Mbps, roughly 35-40 MB/s).

Why this answer

This question tests understanding of USB standards and cable/connector compatibility. USB 3.0 (5 Gbps) requires a cable with 9 pins, but if the case's front-panel header or cable is wired for USB 2.0 only (4 pins), the device will fall back to USB 2.0 speeds (480 Mbps, ~35 MB/s). The correct answer is that the front-panel USB port is internally connected to a USB 2.0 header.

Full explanation →

589

MCQmedium

A technician is troubleshooting a connectivity issue where a user's computer can ping the default gateway but cannot access a web server at 203.0.113.50. The technician runs a tracert and sees that the first hop responds, but subsequent hops time out. What is the most likely cause?

A.The default gateway is down.

B.The web server is offline.

C.A router along the path is misconfigured or dropping packets.

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

AnswerC

The first hop works, but subsequent hops timing out indicates a routing issue beyond the local network, likely a misconfigured router or firewall blocking traffic.

Why this answer

The tracert output shows the first hop (the default gateway) responds, confirming the user's computer can reach the local network. The subsequent timeouts indicate that packets are being dropped or discarded beyond the gateway, which points to a misconfigured router or a router along the path that is dropping packets (e.g., due to an ACL, routing loop, or MTU issue). This explains why the user can ping the gateway but cannot reach the web server at 203.0.113.50.

Exam trap

The trap here is that candidates assume all timeouts in a traceroute mean the destination is unreachable, when in fact timeouts on intermediate hops specifically indicate a problem with a router along the path, not the endpoint.

How to eliminate wrong answers

Option A is wrong because the default gateway is not down; the user can ping it and the first hop of tracert responds, which directly contradicts a down gateway. Option B is wrong because the web server being offline would typically cause a timeout at the final hop or an immediate failure, but here the timeouts occur on intermediate hops, not at the destination. Option D is wrong because a duplicate IP address would cause intermittent connectivity or address conflict errors on the local network, not a clean break where only the first hop responds and subsequent hops time out.

Full explanation →

590

MCQeasy

A customer brings in an iPhone that is running iOS 15 and complains that a newly released app crashes immediately upon launch. The app requires iOS 16 or later. What is the best solution?

A.Reinstall the app from the App Store.

B.Update the iPhone to iOS 16 or later.

C.Restart the iPhone to clear temporary files.

D.Download an older version of the app from a third-party site.

AnswerB

Updating the OS to meet the app's minimum requirement resolves the compatibility issue.

Why this answer

The app crashes because it requires iOS 16 APIs and frameworks that are not present in iOS 15. Updating the iPhone to iOS 16 or later provides the necessary runtime environment, resolving the compatibility issue at the system level.

Exam trap

The 220-1201 exam often tests the misconception that reinstalling or restarting can fix compatibility issues, when the real root cause is a missing OS version requirement that only an update can address.

How to eliminate wrong answers

Option A is wrong because reinstalling the same app from the App Store will still download the latest version, which requires iOS 16, so the crash will persist. Option C is wrong because restarting the iPhone only clears temporary files and caches, but does not add the required iOS 16 APIs or frameworks. Option D is wrong because downloading an older version from a third-party site is a security risk, violates Apple's code signing and sandboxing policies, and the older version may not be compatible with the device's current iOS 15 or may lack necessary features.

Full explanation →

591

MCQmedium

A user reports that their wireless earbuds produce choppy audio when they walk to the other side of their office, but work fine when near the phone. The office has many metal filing cabinets and concrete walls. Which of the following is the most likely cause of the audio degradation?

A.The earbuds' battery is low.

B.The phone's Bluetooth antenna is weak.

C.There is interference from a nearby microwave oven.

D.Physical obstructions are blocking the Bluetooth signal.

AnswerD

Metal filing cabinets and concrete walls can absorb or reflect Bluetooth signals, causing choppy audio at a distance.

Why this answer

Bluetooth signals (typically in the 2.4 GHz ISM band) are highly susceptible to physical obstructions, especially metal filing cabinets and concrete walls, which can absorb or reflect the signal. When the user moves to the other side of the office, the increased distance and these dense materials cause significant attenuation and multipath interference, resulting in choppy audio. The earbuds work fine near the phone because the signal path is clear and short, confirming that the degradation is due to obstruction rather than a device fault.

Exam trap

CompTIA often tests the misconception that interference from common household devices (like microwaves) is the default cause of Bluetooth issues, but the question's specific mention of 'metal filing cabinets and concrete walls' is a clear clue that physical obstruction is the primary factor.

How to eliminate wrong answers

Option A is wrong because low battery in the earbuds would typically cause intermittent disconnections or power-off, not a distance-dependent choppy audio that correlates with walking to the other side of the office. Option B is wrong because a weak Bluetooth antenna in the phone would cause poor performance even at close range, but the user reports the earbuds work fine near the phone, indicating the phone's antenna is adequate. Option C is wrong because interference from a microwave oven would cause random, location-independent dropouts or static, not a consistent degradation tied to moving behind metal and concrete obstacles.

Full explanation →

592

MCQhard

A technician is troubleshooting a network where users intermittently lose connectivity to a critical database server. The technician notices that the server's IP address is being duplicated on the network. Which protocol is responsible for detecting and reporting this conflict?

A.ARP

B.DHCP

C.ICMP

D.DNS

AnswerA

ARP resolves IP to MAC; a duplicate IP causes ARP table instability, and some systems use ARP probes to detect conflicts.

Why this answer

The Address Resolution Protocol (ARP) is responsible for detecting and reporting IP address conflicts. When a device sends an ARP probe or gratuitous ARP, it announces its IP address; if another device responds, a conflict is detected. This mechanism allows the operating system to alert the user or log the error, as seen in Windows with the 'IP address conflict' notification.

Exam trap

Many candidates mistakenly think DHCP handles conflict detection, but DHCP only avoids conflicts during assignment—it does not monitor for conflicts after the lease is granted, which is why ARP is the correct answer.

How to eliminate wrong answers

Option B (DHCP) is wrong because DHCP is used to dynamically assign IP addresses and manage lease information, but it does not actively detect or report conflicts; it relies on ARP probes to verify address availability. Option C (ICMP) is wrong because ICMP handles error reporting and diagnostic functions like ping and traceroute, but it does not detect IP address conflicts; it operates at the network layer without MAC address resolution. Option D (DNS) is wrong because DNS translates domain names to IP addresses and has no role in detecting duplicate IP addresses on a local network.

Full explanation →

593

MCQmedium

A technician is configuring a company-issued tablet for a sales representative who frequently works from a car. The tablet needs internet access for CRM software and GPS navigation. Which mobile network connectivity option is most appropriate for this scenario?

A.Connect the tablet to a personal hotspot from the sales rep's smartphone.

B.Install a Wi-Fi extender in the car to boost nearby public Wi-Fi signals.

C.Use a tablet with an integrated cellular modem and a company data plan.

D.Rely on Bluetooth tethering to a laptop for internet access.

AnswerC

A cellular modem provides dedicated, always-on internet access without relying on other devices or Wi-Fi networks.

Why this answer

A tablet with an integrated cellular modem and a company data plan provides dedicated, always-on mobile broadband connectivity independent of external devices or Wi-Fi hotspots. This ensures reliable internet access for CRM and GPS navigation even while the sales representative is driving between locations, without draining a smartphone battery or depending on inconsistent public Wi-Fi.

Exam trap

The 220-1201 exam often tests the misconception that tethering or Wi-Fi extenders are equivalent to dedicated cellular connectivity, but the trap here is that candidates overlook the reliability and independence required for mobile work in a vehicle, where the tablet must function without depending on other devices or fixed infrastructure.

How to eliminate wrong answers

Option A is wrong because a personal hotspot relies on the smartphone's cellular connection and battery, which can be drained quickly during extended use in a car, and introduces a single point of failure if the smartphone loses signal or runs out of power. Option B is wrong because a Wi-Fi extender cannot create a new internet connection; it only repeats existing Wi-Fi signals, and public Wi-Fi is rarely available or reliable inside a moving vehicle. Option D is wrong because Bluetooth tethering to a laptop typically provides slower speeds (Bluetooth 5.0 max ~2 Mbps) and requires the laptop to have its own internet connection, which is not guaranteed in a car scenario.

Full explanation →

594

MCQhard

A technician is troubleshooting a laptop that emits a series of beeps (one long, two short) on startup and displays nothing on the screen. The laptop was working fine until the user installed a new RAM module. What is the most likely cause?

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

B.The laptop's display cable has become disconnected

C.The laptop's CMOS battery is dead

D.The user accidentally damaged the motherboard when installing the RAM

AnswerA

Incompatible or improperly seated RAM can cause POST failures that produce beep codes. Some motherboards map memory errors to video-related beep codes. The timing (after RAM install) strongly suggests this.

Why this answer

One long and two short beeps is a common BIOS POST code indicating a video or display adapter issue. However, since the problem started after installing RAM, it is likely that the RAM module is incompatible or not seated properly, causing a memory-related POST failure that manifests as a video error code on some systems.

Full explanation →

595

MCQhard

During a hardware upgrade, you install a new high-end graphics card and connect a 144Hz gaming monitor via DisplayPort. The monitor is set to 144Hz in Windows, but the screen occasionally goes black for a few seconds during gameplay. What is the most likely cause?

A.The graphics card is overheating.

B.The monitor's refresh rate is set too high for the cable.

C.The power supply unit is insufficient.

D.The monitor's firmware is outdated.

AnswerB

DisplayPort cables have bandwidth limits; a cable rated for lower speeds may cause signal loss at 144Hz, resulting in black screens. Using a certified high-speed cable resolves this.

Why this answer

Intermittent black screens at high refresh rates often indicate that the DisplayPort cable does not meet the required bandwidth for 144Hz at the monitor's resolution. This can also be caused by power supply issues or driver problems, but cable bandwidth is a common culprit.

Full explanation →

596

MCQeasy

A user reports that their new monitor, which uses a DisplayPort connection, shows no signal. The technician finds the monitor is connected to the PC's HDMI port via a passive adapter. What is the most likely issue?

A.The HDMI cable is faulty

B.The monitor is set to the wrong input source

C.The passive adapter cannot convert HDMI to DisplayPort

D.The graphics driver is outdated

AnswerC

Passive adapters only work for DisplayPort to HDMI, not the reverse, so an active adapter is needed.

Why this answer

Passive DisplayPort to HDMI adapters often require an active adapter to convert the signal properly, especially if the source only outputs HDMI. This tests understanding of signal conversion and adapter types. The monitor's DisplayPort input needs a compatible signal from the PC's HDMI output.

Full explanation →

597

MCQeasy

A customer complains that their smartphone's mobile hotspot stops working after a few minutes. They are using a prepaid data plan. What is the most likely cause?

A.The smartphone's battery saver mode is turning off the hotspot.

B.The connected device is out of Bluetooth range.

C.The carrier's prepaid plan restricts hotspot usage or throttles data.

D.The smartphone's Wi-Fi antenna is overheating.

AnswerC

Prepaid plans often have hotspot limits or throttling, causing the connection to drop or slow after initial use.

Why this answer

This scenario highlights carrier restrictions on tethering. Many prepaid plans limit hotspot usage or throttle data after a certain amount, causing the hotspot to disconnect or slow down.

Full explanation →

598

MCQmedium

After deploying a new 802.11ac access point, users report that some devices can connect but others cannot, even though they are in the same room. All devices support 5 GHz. What is the most likely cause?

A.The access point is using a non-overlapping channel.

B.The access point has 2.4 GHz radios disabled.

C.The devices have incorrect SSID credentials.

D.The access point is overloaded with clients.

AnswerD

An overloaded access point can reach its maximum client limit, allowing only some devices to connect while rejecting others. This matches the reported symptom and is the most likely cause.

Why this answer

The scenario describes that some devices can connect while others cannot, even though all devices support 5 GHz. This points to a resource limitation on the access point rather than a radio band issue. If the access point is overloaded with clients, it may reach its maximum association limit, rejecting new connections while existing ones remain active.

This explains why some devices are connected and others are not. Option B is incorrect because disabling 2.4 GHz radios would not affect devices that support 5 GHz. Option A is not a problem, as non-overlapping channels are beneficial.

Option C would affect all devices uniformly.

Full explanation →

599

MCQmedium

A technician is setting up a new Android tablet for a warehouse worker who uses a barcode scanner app that requires constant Wi-Fi. The warehouse has multiple access points with the same SSID. The tablet frequently disconnects and reconnects as the worker moves around. What should the technician configure to improve connectivity?

A.Set the tablet to use a static IP address.

B.Disable the tablet's Bluetooth radio.

C.Configure the tablet to prefer the 2.4 GHz band over 5 GHz.

D.Enable the 'Wi-Fi roaming' or 'aggressive handover' setting in the tablet's advanced Wi-Fi options.

AnswerD

This setting optimizes the device to quickly reassociate with a stronger AP, reducing disconnects when moving.

Why this answer

Option D is correct because enabling 'Wi-Fi roaming' or 'aggressive handover' configures the tablet to actively scan for stronger access points and initiate a faster re-association when signal strength degrades. This setting reduces the disconnection/reconnection cycles common in multi-AP environments with the same SSID by triggering a proactive handoff before the current link is lost.

Exam trap

The 220-1201 exam often tests the misconception that static IP addresses or disabling other radios solve roaming issues, when the real solution is adjusting the client's roaming aggressiveness to match the multi-AP environment.

How to eliminate wrong answers

Option A is wrong because a static IP address does not affect the roaming decision or handover behavior; it only prevents IP address changes, which is irrelevant to the frequent disconnects caused by sticky client behavior. Option B is wrong because Bluetooth operates on 2.4 GHz but does not interfere with Wi-Fi roaming logic; disabling it would not improve the tablet's ability to switch between access points. Option C is wrong because 2.4 GHz offers longer range but is more congested and prone to interference; the issue is not frequency preference but the tablet's reluctance to roam to a stronger AP, and forcing 2.4 GHz could actually worsen performance in a dense warehouse.

Full explanation →

600

MCQmedium

A user reports that their computer is making a loud grinding noise and then shuts down after a few minutes. The CPU temperature is normal at idle. What is the most likely cause?

A.Hard drive failure

B.CPU fan bearing failure

C.Power supply fan failure

D.Loose CPU cooler

AnswerB

A failing fan bearing causes grinding noise and can lead to inadequate cooling under load, triggering thermal shutdown.

Why this answer

A grinding noise typically indicates a mechanical bearing failure in a fan. The CPU fan may still spin but fail under load, causing overheating and shutdown. This scenario tests the ability to correlate auditory symptoms with hardware failure.

Full explanation →

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