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CompTIA A+ Core 1 220-1201 (220-1201) — Questions 676–750

871 questions total · 12pages · All types, answers revealed

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676
MCQmedium

A customer complains that their VoIP phone intermittently drops calls. A technician checks the network and finds high latency and jitter during peak hours. Which network service should be configured to prioritize VoIP traffic?

A.DHCP
B.QoS
C.DNS
D.VPN
AnswerB

QoS classifies and marks VoIP packets, then schedules them through low-latency priority queues, so voice frames bypass the queuing delay causing jitter and call drops during peak congestion. This directly addresses the latency and jitter the technician observed.

Why this answer

B is correct because Quality of Service (QoS) is the network service designed to manage bandwidth and prioritize time-sensitive traffic like VoIP. By marking VoIP packets (e.g., with DSCP EF or CoS 5) and applying queuing mechanisms such as LLQ or CBWFQ, QoS reduces latency and jitter during congestion, directly addressing the intermittent call drops during peak hours.

Exam trap

The trap here is that candidates often confuse network services like DHCP (address assignment) and DNS (name resolution) with traffic management. QoS is the correct service to prioritize VoIP traffic and reduce latency/jitter during congestion.

How to eliminate wrong answers

Option A is wrong because DHCP (Dynamic Host Configuration Protocol) is used for automatic IP address assignment and network configuration, not for traffic prioritization or congestion management. Option C is wrong because DNS (Domain Name System) resolves domain names to IP addresses and has no role in prioritizing or shaping network traffic. Option D is wrong because a VPN (Virtual Private Network) encrypts and tunnels traffic for security, but it does not prioritize VoIP packets; in fact, VPN overhead can increase latency and jitter if not properly configured with QoS.

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677
MCQhard

A network administrator is designing a new subnet scheme for a company with 4 departments: Sales (50 devices), HR (25 devices), IT (10 devices), and Management (5 devices). The company uses the 10.0.0.0/8 network. To minimize wasted IP addresses, which subnet mask should be used for the Sales department?

A.255.255.255.0
B.255.255.255.192
C.255.255.255.224
D.255.255.255.240
AnswerB

This subnet mask corresponds to a /26 CIDR prefix, meaning 26 bits are used for the network portion and 6 bits (32 - 26) are available for host addresses. This configuration yields 2^6 - 2, or 62 usable host IP addresses. This range is ideal for 50 devices, offering sufficient capacity with a reasonable buffer for minor expansion, thereby minimizing IP address waste and creating an appropriately sized broadcast domain for the specified requirement.

Why this answer

The Sales department requires 50 usable IP addresses. A /26 subnet mask (255.255.255.192) provides 64 total addresses, with 62 usable addresses (2^6 - 2 = 62), which is the smallest subnet that can accommodate 50 devices without wasting IPs. This aligns with the goal of minimizing wasted addresses in the 10.0.0.0/8 network.

Exam trap

The 220-1201 exam often tests the ability to calculate the smallest subnet that meets host requirements. The trap here is that candidates may choose a mask that is too small (e.g., a /27, which only provides 30 usable addresses, insufficient for 50 devices), or they may overestimate and pick a /24 mask out of habit, which works but wastes too many IP addresses.

How to eliminate wrong answers

Option A (255.255.255.0) is wrong because it provides 254 usable addresses (2^8 - 2 = 254), which is far more than the 50 needed, resulting in significant IP waste. Option C (255.255.255.224) is wrong because it provides only 30 usable addresses (2^5 - 2 = 30), which is insufficient for 50 devices. Option D (255.255.255.240) is wrong because it provides only 14 usable addresses (2^4 - 2 = 14), far too few for the Sales department.

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678
MCQhard

A technician is troubleshooting a server that uses a RAID 6 array with six 4 TB HDDs. One drive fails, and after replacement, the rebuild process is taking much longer than expected. The array is still online. What is the most likely reason for the slow rebuild?

A.The replacement drive is of a different RPM.
B.The RAID controller is faulty.
C.The array is performing background consistency checks.
D.The large capacity of the drives and the double parity overhead are causing the slow rebuild.
AnswerD

RAID 6 rebuilds are inherently slow due to the necessity of calculating two independent parity blocks (P and Q) for each data stripe. This process requires reading data from all remaining operational drives to reconstruct the missing data, performing intensive computational parity calculations, and then writing the reconstructed data and updated parity to the new drive. With 4 TB drives, the immense volume of data amplifies these I/O and CPU demands, making the rebuild a prolonged and resource-intensive operation.

Why this answer

RAID 6 rebuilds are slow due to the need to calculate and write double parity across all drives, combined with the large capacity of the drives. With 4 TB drives, the rebuild process must read from all surviving drives and reconstruct data, which is I/O intensive and time-consuming. The double parity overhead adds additional computation, further slowing the process.

Exam trap

220-1201 often tests RAID rebuild times, and candidates may incorrectly attribute slowness to drive RPM or controller issues, overlooking the inherent overhead of double parity and large capacity.

How to eliminate wrong answers

Option A is wrong because a different RPM drive might affect performance slightly, but it is not the primary reason for a significantly slow rebuild; RAID 6 rebuilds are inherently slow regardless of RPM. Option B is wrong because a faulty RAID controller would likely cause more severe issues, such as array failure or errors, not just a slow rebuild. Option C is wrong because background consistency checks can compete for I/O, but they are not the primary reason; the rebuild itself is the dominant factor.

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679
MCQhard

A company needs to deploy a virtualized environment where each VM must be isolated from others for security reasons, but all VMs share the same physical network. Which virtual networking configuration should be used?

A.Use a virtual switch with port groups assigned to different VLANs
B.Configure each VM with a different MAC address
C.Use bridged networking for all VMs
D.Assign each VM a static IP address from a different subnet
AnswerA

Using a virtual switch with port groups assigned to distinct VLANs is the correct approach for network segmentation in a virtualized environment. Each port group can be configured with a specific VLAN ID, ensuring that virtual machines connected to different port groups are logically isolated at Layer 2. This prevents direct communication between VMs in different VLANs without a router, effectively segmenting traffic and enhancing security and network organization.

Why this answer

VLANs provide network isolation at Layer 2, allowing VMs on the same physical network to be separated logically. This is a common security practice in virtualized environments.

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680
MCQmedium

A user reports that they can receive emails but cannot send any. The email client is configured with SMTP on port 25. The IT team confirms that port 25 is blocked by the ISP. Which alternative port should be used for SMTP submission?

A.Port 110
B.Port 143
C.Port 587
D.Port 993
AnswerC

Port 587 is the standard SMTP submission port, used by mail clients to authenticate and send outgoing messages. Since the ISP blocks port 25, switching the client's SMTP configuration to 587 restores sending while receiving via IMAP or POP3 remains unaffected.

Why this answer

Port 587 is the standard SMTP submission port defined in RFC 6409 for email clients to send outgoing mail. Unlike port 25, which is used for SMTP relay between mail servers and is often blocked by ISPs to prevent spam, port 587 is specifically designated for client-to-server submission and typically supports STARTTLS encryption. Using port 587 bypasses the ISP's block on port 25 while adhering to modern email security practices.

Exam trap

CompTIA often tests the misconception that any port associated with email (like POP3 on 110 or IMAP on 143) can be used for sending, when in fact only SMTP-specific ports (25, 587, or 465) handle outgoing mail.

How to eliminate wrong answers

Option A is wrong because port 110 is used for POP3 (Post Office Protocol 3), which retrieves incoming emails from a mail server, not for sending emails. Option B is wrong because port 143 is used for IMAP (Internet Message Access Protocol), which manages incoming emails on the server, not for SMTP submission. Option D is wrong because port 993 is used for IMAP over SSL/TLS (IMAPS), which secures incoming email retrieval, not for sending emails via SMTP.

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681
MCQmedium

A user reports that their external monitor connected to a laptop via HDMI flickers intermittently. The laptop's built-in display works fine. You have tried a different HDMI cable and a different monitor, but the flickering persists. What should you check next?

A.Update the graphics driver to the latest version.
B.Replace the video cable with a DisplayPort cable.
C.Inspect the HDMI port on the laptop for physical damage or debris.
D.Disable the laptop's built-in display to force the external monitor as primary.
AnswerC

Since the external monitor and cable have been ruled out as the source of the problem, the laptop's HDMI port becomes the primary suspect. Physical damage, such as bent pins, or accumulated debris like dust or lint, can disrupt the electrical connection, leading to flickering or a complete loss of signal. Inspecting and carefully cleaning the port is a critical first step in diagnosing and resolving such hardware-related display issues.

Why this answer

The issue is isolated to the external monitor connection, and swapping cable and monitor didn't help. This points to a defective or loose HDMI port on the laptop, which can cause intermittent signal loss. Testing with a known-good display on a different port or device confirms the port as the root cause.

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682
MCQeasy

A customer reports that their laptop can connect to the internet via a wired connection but cannot access any network shares or printers by hostname. They can ping the IP address of the file server. Which network service is most likely misconfigured?

A.DHCP
B.DNS
C.NAT
D.ARP
AnswerB

Name resolution fails while IP connectivity succeeds, so the fault lies in the service mapping hostnames to IP addresses. DNS is misconfigured or unreachable, preventing resolution of file server and printer names even though ICMP to the server's address works.

Why this answer

The user can ping the file server by IP address, which confirms that basic IP connectivity (Layer 3) is working. However, they cannot access network shares or printers by hostname, which indicates that the system cannot resolve those hostnames to IP addresses. DNS (Domain Name System) is the service responsible for translating hostnames to IP addresses, so a misconfigured DNS server or client DNS settings would cause exactly this symptom.

Exam trap

The trap here is that candidates may confuse DNS with DHCP, thinking that DHCP provides name resolution, but DHCP only provides the address of the DNS server—it does not perform the actual hostname-to-IP translation.

How to eliminate wrong answers

Option A is wrong because DHCP is used to automatically assign IP addresses, subnet masks, default gateways, and DNS server addresses; since the user can obtain an IP address and ping by IP, DHCP is functioning correctly. Option C is wrong because NAT (Network Address Translation) translates private IP addresses to public IP addresses for internet access; the user can already connect to the internet via wired connection, so NAT is not the issue. Option D is wrong because ARP (Address Resolution Protocol) resolves IP addresses to MAC addresses on the local network; the user can ping the file server by IP, which already requires successful ARP resolution, so ARP is working.

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683
MCQeasy

A user is setting up a new tablet and wants to share its internet connection with a laptop that has no cellular capability. The tablet has a cellular data plan. Which configuration should the user enable on the tablet?

A.Enable Bluetooth pairing only.
B.Enable Wi-Fi hotspot.
C.Enable airplane mode.
D.Enable NFC.
AnswerB

Wi-Fi hotspot (tethering) rebroadcasts the tablet's cellular data connection as a wireless access point, letting the laptop associate and route traffic through it. This directly satisfies the requirement to share internet with a device lacking cellular capability.

Why this answer

Enabling a Wi-Fi hotspot on the tablet creates a local wireless network that the laptop can connect to, sharing the tablet's cellular data connection. This is the standard method for tethering when the client device (laptop) lacks cellular capability but has Wi-Fi. Bluetooth pairing (option A) can also share internet, but it is slower and not the primary method for a laptop that expects a Wi-Fi connection.

Exam trap

CompTIA often tests the distinction between Bluetooth tethering and Wi-Fi hotspot, where candidates mistakenly choose Bluetooth because they know it can share internet, but the question's context (a laptop with no cellular capability) implies the need for a standard, high-speed Wi-Fi connection that the laptop can easily join.

How to eliminate wrong answers

Option A is wrong because Bluetooth tethering, while capable of sharing internet, typically provides much lower throughput (often <3 Mbps) and is not the standard configuration for sharing a cellular connection with a laptop that expects Wi-Fi; the question asks for the configuration to enable, and Wi-Fi hotspot is the direct answer. Option C is wrong because enabling airplane mode disables all wireless radios (cellular, Wi-Fi, Bluetooth), which would cut off the tablet's internet connection and prevent any sharing. Option D is wrong because NFC is designed for very short-range data exchange (a few centimeters) and is not used for internet connection sharing; it lacks the bandwidth and protocol support for tethering a laptop.

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684
MCQmedium

A technician is troubleshooting a desktop that fails to boot and displays 'No bootable device' after a power outage. The system has a single SATA SSD for the OS and a separate HDD for data. The BIOS detects both drives. What should the technician check first?

A.Replace the SATA cable for the SSD.
B.Check the boot order in BIOS/UEFI.
C.Run a CHKDSK on the HDD.
D.Replace the CMOS battery.
AnswerB

A power outage or unexpected system shutdown can sometimes corrupt or reset the BIOS/UEFI configuration, including the critical boot order settings. If the system is failing to boot from the SSD, even though the drive is detected, it is highly probable that the boot sequence has been inadvertently altered. Correcting the boot order to prioritize the SSD ensures the system attempts to load the operating system from the correct device, resolving the boot issue.

Why this answer

After a power outage, the BIOS/UEFI settings may have been reset or the boot order may have changed, causing the system to not find a bootable device even though both drives are detected. Checking the boot order in BIOS/UEFI is the first logical step because it is non-invasive and addresses the most common cause of 'No bootable device' when drives are detected. Option B is correct.

Exam trap

220-1201 often tests the tendency to jump to hardware replacement (cables, CMOS battery) when a simple BIOS boot order check is the correct first step, especially when drives are detected.

How to eliminate wrong answers

Option A is wrong because if the BIOS detects both drives, the SATA cable for the SSD is likely functioning; a faulty cable would typically cause the drive not to be detected at all. Option C is wrong because running CHKDSK on the HDD (data drive) would not resolve a boot issue, as the OS is on the SSD; CHKDSK is for file system errors on a specific volume, and the HDD is not the boot drive. Option D is wrong because replacing the CMOS battery addresses lost BIOS settings over time, but the immediate issue is boot order; also, a power outage could reset BIOS, but checking boot order first is more direct and does not require hardware replacement.

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685
MCQhard

A company plans to migrate a physical server running a legacy application to a virtual machine to reduce hardware costs. The application requires direct access to a proprietary PCIe card installed in the physical server. Which virtualization feature must the hypervisor support to allow the VM to use this card?

A.Virtual machine snapshots
B.Virtual switch VLAN tagging
C.PCI passthrough (VT-d/IOMMU)
D.Virtual machine migration (vMotion)
AnswerC

PCI passthrough, leveraging technologies like Intel VT-d or AMD-Vi (IOMMU), is the correct solution as it allows a virtual machine to gain exclusive, direct access to a physical PCI or PCIe device installed in the host server. This bypasses the hypervisor's virtualization layer for the specific device, providing near-native performance and full driver compatibility within the guest OS, which is essential for proprietary hardware requiring direct, low-latency interaction.

Why this answer

PCI passthrough (also called VT-d or IOMMU-based device assignment) allows a hypervisor to give a VM direct, exclusive access to a physical PCIe device such as a proprietary card. The hypervisor uses the IOMMU to remap DMA so the VM can drive the device natively without emulation. This is the only listed feature that enables direct hardware access to a PCIe card from within a VM.

Exam trap

220-1201 often tests whether candidates confuse virtualization features that sound hardware-related (snapshots, vMotion, VLAN tagging) with the specific IOMMU-based mechanism required for direct physical device access.

How to eliminate wrong answers

Option A is wrong because VM snapshots capture the state of a VM's disk/memory for backup or rollback and have nothing to do with hardware device access. Option B is wrong because virtual switch VLAN tagging is a Layer 2 networking feature for segmenting traffic, unrelated to PCIe device assignment. Option D is wrong because vMotion (live migration) moves a running VM between hosts and actually complicates passthrough because passthrough devices are tied to a specific host — it does not enable device access.

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686
MCQeasy

A customer brings in a smartphone with a cracked glass digitizer that still responds to touch, but the LCD underneath is intact. They want the cheapest repair that restores full functionality. Which component should you replace?

A.Replace the entire screen assembly (LCD + digitizer).
B.Replace only the LCD panel.
C.Replace only the digitizer.
D.Apply a glass screen protector and ignore the crack.
AnswerC

The digitizer is the specific component responsible for detecting touch input and is typically a distinct layer positioned above the LCD. Since the smartphone has a cracked screen but the display itself is still fully functional, only the digitizer requires replacement. This targeted repair directly addresses the damaged touch-sensitive layer, restoring full touch functionality at the most cost-effective price point, avoiding unnecessary replacement of the working LCD.

Why this answer

The digitizer (touch layer) is the only damaged component; the LCD is intact and the touch function still works. Replacing only the digitizer restores full functionality at the lowest cost, as it avoids the expense of replacing the undamaged LCD panel.

Exam trap

CompTIA often tests the misconception that a cracked digitizer always requires full screen assembly replacement, but the key is that if touch still works and the LCD is intact, a digitizer-only replacement is the cheapest functional repair.

How to eliminate wrong answers

Option A is wrong because replacing the entire screen assembly (LCD + digitizer) is more expensive than necessary when only the digitizer is cracked and the LCD is intact. Option B is wrong because replacing only the LCD panel would not fix the cracked digitizer, leaving the cosmetic and structural damage unaddressed, and the LCD is already functional. Option D is wrong because applying a glass screen protector does not repair the cracked digitizer; it only covers the damage and does not restore full structural integrity or prevent further cracking.

Full explanation →
687
MCQhard

A technician is deploying a new network in a warehouse and needs to measure the length of a spool of Cat6a cable before installation to ensure it does not exceed the 100-meter segment limit. Which tool should be used?

A.Multimeter
B.Cable tester
C.TDR (Time-Domain Reflectometer)
D.Tone generator
AnswerC

A Time-Domain Reflectometer (TDR) is the ideal tool for measuring cable length by injecting a signal pulse into the cable and analyzing the reflections that return. By precisely measuring the time it takes for the reflected signal to return and knowing the cable's nominal velocity of propagation (NVP), the TDR accurately calculates the distance to any impedance discontinuity, including the cable's end. This makes it specifically suited for determining the exact length of installed cabling segments.

Why this answer

A Time-Domain Reflectometer (TDR) sends a pulse down the cable and measures the time it takes for the reflection to return from the far end or from a fault. By calculating the propagation velocity of the signal, the TDR can accurately determine the cable length, making it the correct tool to verify that a spool of Cat6a cable does not exceed the 100-meter segment limit before installation.

Exam trap

The trap here is that candidates often confuse a basic cable tester (which only checks continuity and wiring) with a TDR, assuming any 'cable tester' can measure length, but only a TDR (or a high-end certifier with TDR capability) can provide accurate length measurements.

How to eliminate wrong answers

Option A is wrong because a multimeter measures electrical properties like voltage, current, and resistance, not cable length. Option B is wrong because a basic cable tester only checks continuity, wiring faults, and pinout correctness, but does not measure the physical length of a cable spool. Option D is wrong because a tone generator is used to trace and identify cables by injecting an audio signal, not to measure cable length.

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688
MCQmedium

A technician is configuring a RAID 5 array with three 2 TB hard drives for a small office server. After installation, the array is not recognized by the RAID controller. The drives spin up and are detected individually. What is the most likely oversight?

A.The drives are not compatible with RAID 5.
B.The RAID array has not been initialized.
C.The SATA cables are faulty.
D.The power supply is insufficient.
AnswerB

After physically installing the drives and ensuring they are detected by the RAID controller, the logical RAID 5 array must be explicitly created and initialized within the controller's BIOS utility or management software. This critical step involves defining the RAID level, selecting the member drives, and often performing an initial synchronization or parity calculation across the disks. Until this initialization process is complete, the operating system will not recognize a single logical volume, even if all physical drives are functioning correctly.

Why this answer

After physically installing drives in a RAID 5 array, the RAID controller must initialize the array (create the logical volume and write parity/configuration metadata) before the operating system can recognize it. Drives detected individually but no array recognized indicates the initialization/creation step was skipped.

Exam trap

220-1201 often tests the distinction between physical drive detection and logical array creation, expecting candidates to know that initialization is a required step after installing drives.

How to eliminate wrong answers

Option A is wrong because 2 TB SATA drives are generally compatible with RAID 5; compatibility is not the issue when drives are detected individually. Option C is wrong because faulty SATA cables would prevent individual drive detection, but the drives spin up and are detected. Option D is wrong because an insufficient power supply would cause drives to fail to spin up or cause system instability, not a missing RAID array.

Full explanation →
689
MCQmedium

A user reports that their computer will not boot and displays an 'Operating System Not Found' error. They recently installed a new SATA SSD and connected it to the motherboard. What is the most likely cause?

A.The SATA cable is faulty.
B.The SSD is not compatible with the motherboard.
C.The boot order in BIOS is not set to the new SSD.
D.The SSD needs to be formatted before use.
AnswerC

When a new SSD containing the operating system is installed, the BIOS/UEFI must be explicitly configured to prioritize booting from this specific drive. If the boot order remains set to an old drive, a non-existent device, or attempts to boot from a network, the system will fail to locate the operating system's bootloader on the new SSD. This common oversight results in errors such as 'No boot device found' or 'Operating System not found,' despite the OS being correctly installed on the new drive.

Why this answer

When a new SATA SSD is installed and the system displays 'Operating System Not Found,' the most likely cause is that the BIOS boot order is not set to boot from the new SSD. Even if the SSD contains an OS, the firmware may still be trying to boot from the old drive or another device. Option C is correct.

Exam trap

220-1201 often tests the confusion between a drive not being detected (cable/port issue) and a drive being detected but not bootable (boot order/partition issue), leading candidates to choose cable replacement when boot order is the fix.

How to eliminate wrong answers

Option A is wrong because a faulty SATA cable would typically prevent the drive from being detected in BIOS, but the scenario implies the SSD was recently installed and presumably detected; also, the error is about OS not found, not drive not detected. Option B is wrong because SATA SSDs are generally compatible with motherboards that have SATA ports; compatibility issues are rare and would usually manifest as detection problems. Option D is wrong because formatting is not required for a drive that already contains an OS; if the SSD is new and blank, it wouldn't have an OS, but the question implies the user installed it and expects it to boot, so the issue is boot order.

Full explanation →
690
MCQmedium

A technician is setting up a new branch office and needs to assign IPs to 30 devices. The ISP provided a public IP block of 203.0.113.0/28. The technician decides to use private IPs internally and NAT. Which of the following is the most appropriate private IP range for this network?

A.203.0.113.1 to 203.0.113.14
B.10.0.0.0/8
C.192.168.1.0/24
D.172.16.0.0/12
AnswerC

The 192.168.1.0/24 range is a standard private IP address block, commonly used for small to medium-sized networks. A /24 subnet provides 254 usable host addresses (2^(32-24) - 2 = 256 - 2 = 254), which is perfectly adequate and efficient for a branch office with 30 devices. This choice aligns with best practices for private network addressing, offering sufficient capacity without excessive waste, and is easily managed.

Why this answer

(192.168.1.0/24) is correct because it provides a private IP range (per RFC 1918) that supports up to 254 hosts, which is more than sufficient for 30 devices. The /28 public block from the ISP is used only for NAT translation, not for internal addressing, and private IPs must be used internally to conserve public addresses.

Exam trap

The trap here is that candidates often confuse the ISP-provided public IP range with the internal addressing requirement, mistakenly selecting the public block (Option A) for internal use instead of recognizing that private IPs (RFC 1918) must be used behind NAT.

How to eliminate wrong answers

Option A is wrong because 203.0.113.1 to 203.0.113.14 is the usable public IP range from the ISP's /28 block, not a private IP range; using public IPs internally defeats the purpose of NAT and wastes scarce public addresses. Option B is wrong because 10.0.0.0/8 is a valid private range but is far too large (over 16 million addresses) for a network with only 30 devices, making it inefficient and unnecessarily complex for a small branch office. Option D is wrong because 172.16.0.0/12 is a valid private range but is also oversized (over 1 million addresses) and less common for small networks; the /24 subnet is the standard choice for simplicity and compatibility.

Full explanation →
691
MCQhard

A user reports that a VM running Linux suddenly displays a 'Kernel Panic' error after the technician applied a snapshot and then reverted to it. The snapshot was taken while the VM was running. What is the most likely cause of the kernel panic?

A.The snapshot file became corrupted due to insufficient disk space.
B.The VM’s virtual disk was configured as thin provisioned and ran out of space.
C.The snapshot captured the VM in a state where the file system was inconsistent (e.g., during a write operation).
D.The hypervisor’s time synchronization caused a clock skew.
AnswerC

Taking a snapshot of a running VM without quiescing the file system can capture the disk state at an arbitrary point, potentially in the middle of a write operation or an incomplete transaction. If this snapshot is reverted, the file system metadata might not accurately reflect the actual data blocks, leading to an inconsistent state. When the Linux kernel attempts to mount or access this inconsistent file system during boot, it can encounter critical errors that trigger a kernel panic, as it cannot reconcile the file system's integrity.

Why this answer

A snapshot taken while a VM is running captures the disk state at a point in time, but the guest OS may have in-flight writes and an inconsistent file system/journal. Reverting to such a snapshot can present the Linux kernel with a corrupted or inconsistent root filesystem, causing a kernel panic on boot. This is why hypervisors recommend quiescing or shutting down the VM before snapshotting for critical workloads.

Exam trap

The trap is attributing a post-revert kernel panic to storage capacity or time sync rather than recognizing that a running-state snapshot is only crash-consistent and can leave the filesystem inconsistent.

How to eliminate wrong answers

Option A is wrong because insufficient disk space would typically cause snapshot creation or write failures, not a kernel panic specifically tied to reverting a running-state snapshot. Option B is wrong because thin provisioning running out of space would cause write errors or VM pause, not a kernel panic from an inconsistent filesystem. Option D is wrong because clock skew from hypervisor time sync causes time drift and service issues, not a kernel panic immediately after a snapshot revert.

Full explanation →
692
MCQeasy

A customer reports that their new laptop cannot connect to the internet at a coffee shop, but their smartphone works fine. The technician checks the laptop's network settings and sees the Wi-Fi adapter is enabled and connected to the correct SSID. Which protocol is most likely not configured correctly on the laptop?

A.DNS
B.DHCP
C.HTTP
D.ARP
AnswerB

DHCP (Dynamic Host Configuration Protocol) is critical for automatically assigning the necessary IP configuration to network devices, including an IP address, subnet mask, default gateway, and DNS server addresses. For a new laptop, if its DHCP client is disabled, misconfigured, or if the DHCP server is unavailable, the laptop will fail to obtain a usable IP address. This lack of fundamental network configuration directly prevents the laptop from establishing any network connectivity.

Why this answer

The laptop is connected to the Wi-Fi network (SSID) and the adapter is enabled, but it cannot access the internet. This indicates the laptop likely failed to obtain an IP address and other network configuration parameters from the coffee shop's router. DHCP (Dynamic Host Configuration Protocol) is responsible for automatically assigning an IP address, subnet mask, default gateway, and DNS server addresses.

If DHCP is misconfigured or the laptop's DHCP client is disabled or not functioning, the device will not receive a valid IP address and thus cannot route traffic to the internet, even though the Wi-Fi link is established.

Exam trap

The 220-1201 exam often tests the distinction between 'connected to the Wi-Fi' (Layer 2 association) and 'having internet access' (Layer 3 IP configuration), leading candidates to mistakenly focus on DNS or HTTP when the real issue is DHCP failing to provide a valid IP address.

How to eliminate wrong answers

Option A (DNS) is wrong because DNS resolves domain names to IP addresses; if DNS were misconfigured, the laptop would still be able to access the internet via IP addresses directly, but the symptom is no internet connectivity at all, not just name resolution failure. Option C (HTTP) is wrong because HTTP is an application-layer protocol used for web browsing; a misconfigured HTTP client would only affect web traffic, not all internet connectivity, and the laptop cannot even reach the gateway. Option D (ARP) is wrong because ARP resolves IP addresses to MAC addresses on the local network; while ARP issues could cause local communication problems, the laptop is already connected to the SSID and would still have a link-local address, but the core issue of not obtaining a routable IP address points to DHCP failure, not ARP.

Full explanation →
693
MCQeasy

A customer wants to connect a laptop to a 4K TV for a presentation. The laptop has an HDMI 1.4 port, and the TV supports HDMI 2.0. What is the maximum resolution and refresh rate the customer can expect?

A.4K at 60Hz
B.1080p at 120Hz
C.4K at 30Hz
D.1440p at 60Hz
AnswerC

This is the correct answer because HDMI 1.4 has a maximum bandwidth of 10.2 Gbps, which is sufficient to transmit a 4K (3840x2160 or 4096x2160) resolution, but only at a refresh rate of 30Hz. While newer HDMI versions offer higher refresh rates for 4K, 4K at 30Hz represents the highest pixel count (resolution) achievable with the HDMI 1.4 standard, fulfilling the "maximum resolution" requirement for the laptop.

Why this answer

HDMI 1.4 is limited to a maximum data rate of 10.2 Gbps, which supports 4K (3840×2160) only at 30Hz due to insufficient bandwidth for 60Hz. The TV's HDMI 2.0 capability does not increase the laptop's output; the connection operates at the lower version's capabilities. Thus, the maximum achievable is 4K at 30Hz.

Exam trap

This question tests the misconception that the display's higher HDMI version will override the source's lower version, leading candidates to choose 4K at 60Hz (Option A) without recognizing that the laptop's HDMI 1.4 port is the limiting factor.

How to eliminate wrong answers

Option A is wrong because HDMI 1.4 lacks the 18 Gbps bandwidth required for 4K at 60Hz, which is a feature of HDMI 2.0. Option B is wrong because 1080p at 120Hz would require HDMI 1.4b or higher with specific support, and the question specifies HDMI 1.4 (not 1.4b), which typically maxes at 1080p 60Hz or 1080p 120Hz only with reduced color depth or chroma subsampling, but the customer's focus is on 4K TV, making this resolution/refresh rate irrelevant to the maximum for 4K. Option D is wrong because 1440p at 60Hz is not a standard HDMI 1.4 supported mode; HDMI 1.4's maximum for 1440p is typically 60Hz only with reduced blanking or non-standard timings, and the question asks for the maximum with a 4K TV, which is 4K at 30Hz.

Full explanation →
694
MCQeasy

A user reports that their computer does not power on at all. The technician verifies the power cord is connected and the wall outlet works. When the PSU is turned on, no fans spin and no LEDs light up. What should the technician check first?

A.Replace the CMOS battery.
B.Check if the power supply's on/off switch is set to the '1' (on) position.
C.Reseat the RAM modules.
D.Test the PSU with a multimeter.
AnswerB

The power supply unit (PSU) often includes a physical on/off switch on its rear panel, typically marked '0' for off and '1' for on. If this switch is in the '0' (off) position, it completely interrupts the flow of AC power from the wall outlet to the PSU's internal components, preventing any DC power from being delivered to the motherboard or other system components. This simple oversight is a common cause of a computer appearing completely dead, making it the most logical and immediate troubleshooting step to verify primary power delivery.

Why this answer

The power supply switch is a simple but common oversight; if it is in the off (0) position, no power reaches the system. Always verify this before more complex troubleshooting. Other steps like testing the PSU with a multimeter or paperclip test come after confirming the switch is on.

Full explanation →
695
MCQmedium

A company’s web server is accessible from the internal network but not from the internet. The server has a static IP of 192.168.1.10, and the router’s public IP is 203.0.113.50. What configuration is most likely missing?

A.The server’s default gateway is incorrect.
B.A firewall rule on the server is blocking inbound traffic.
C.Port forwarding is not configured on the router.
D.The DNS A record for the server points to the wrong IP.
AnswerC

For a web server located on a private internal network behind a Network Address Translation (NAT) router, port forwarding is absolutely essential for external accessibility. This configuration instructs the router to listen for incoming connection requests on a specific public port (like 80 for HTTP or 443 for HTTPS) on its public IP address. It then translates and directs those requests to the web server's specific private IP address and corresponding port on the internal network. Without this crucial mapping, external requests attempting to reach the public IP address will not know which internal device to send the traffic to, effectively making the server unreachable from the internet despite being fully functional internally.

Why this answer

The server has a private IP (192.168.1.10) and is reachable internally, but external users cannot reach it because the router is not translating inbound traffic on the public IP (203.0.113.50) to the internal server. Port forwarding (destination NAT) must be configured on the router to map the public IP and port to the internal server's IP and port. Without it, inbound connections from the internet never reach the web server.

Exam trap

220-1201 often tests the distinction between internal vs. external reachability — candidates must recognize that internal access working while external fails points to NAT/port forwarding, not gateway or DNS issues.

How to eliminate wrong answers

Option A is wrong because an incorrect default gateway would prevent the server from reaching external networks outbound, but the question states the server is accessible internally and the issue is inbound from the internet. Option B is wrong because a host firewall blocking inbound would also block internal access unless scoped, and the scenario implies internal access works. Option D is wrong because a DNS A record pointing to the wrong IP would cause name resolution failures, but the core issue described is that the server is not reachable from the internet at all, which is a NAT/port-forwarding problem.

Full explanation →
696
MCQeasy

You are deploying 50 tablets for a school and need to secure them in kiosk mode so students can only access a specific learning app. Which hardware servicing step is essential before configuring the software?

A.Install a screen protector on each tablet.
B.Charge each tablet to at least 50% and apply all system updates.
C.Remove the SIM card from each tablet.
D.Replace the stock ROM with a custom firmware.
AnswerB

Ensuring each tablet is charged to at least 50% mitigates the risk of power loss during critical configuration steps, such as applying settings, installing applications, or performing system updates, which could lead to data corruption or an incomplete setup. Simultaneously, applying all system updates before deployment guarantees that the devices are running the latest, most stable, and secure version of the operating system. This proactive approach prevents potential compatibility issues, security vulnerabilities, or unexpected bugs that could disrupt kiosk mode functionality or require post-deployment troubleshooting.

Why this answer

Before configuring kiosk mode software on tablets, the essential hardware servicing step is to charge each device to at least 50% and apply all system updates. Updates ensure the OS and firmware are patched and stable, and adequate charge prevents the device from powering off mid-configuration, which could corrupt the kiosk setup. This is a standard best practice in mobile device deployment.

Exam trap

220-1201 often tests whether candidates recognize that OS updates and adequate battery charge are the true prerequisites for software configuration, while cosmetic or optional steps (screen protectors, SIM removal, custom ROMs) are distractors.

How to eliminate wrong answers

Option A is wrong because a screen protector is a cosmetic/durability accessory, not a prerequisite for software configuration. Option C is wrong because removing the SIM card is unnecessary unless cellular connectivity must be disabled, and it does not affect kiosk software setup. Option D is wrong because replacing the stock ROM with custom firmware is not required for kiosk mode — most tablets support native kiosk or MDM-based kiosk configuration, and custom firmware voids warranties and adds risk.

Full explanation →
697
MCQhard

A network administrator is troubleshooting intermittent connectivity issues on a fiber optic link between two buildings. The link works but has occasional errors. The technician inspects the fiber and finds that the connectors are dirty. After cleaning them, the issue persists. What should the technician check next?

A.Replace the entire fiber cable.
B.Check the light level with a power meter.
C.Swap the SFP modules on both ends.
D.Run a loopback test on the switch ports.
AnswerB

Intermittent connectivity on a fiber link often indicates a problem with signal integrity, such as excessive attenuation or insufficient power. A fiber optic power meter measures the optical power transmitted through the cable, allowing the administrator to determine if the light signal is within acceptable parameters. Low light levels can point to issues like dirty connectors, tight bends, or a damaged cable, providing crucial diagnostic information before more drastic actions are taken.

Why this answer

After cleaning the connectors, the next logical step is to verify the optical signal strength using a power meter. Dirty connectors are a common cause of intermittent errors, but if cleaning doesn't resolve the issue, the problem may be a weak or degraded optical signal due to other factors such as a damaged cable, faulty transceiver, or excessive loss. A power meter measures the actual light level (in dBm) and compares it to the transceiver's specifications, quickly identifying if the signal is too low.

This is a standard troubleshooting step for fiber links and is more efficient than blindly replacing components.

Exam trap

The trap here is that candidates might jump to replacing hardware (cable or SFPs) without first measuring the optical signal, but the exam expects you to know that verifying the light level with a power meter is the logical next step after cleaning connectors.

How to eliminate wrong answers

Option A is wrong because replacing the entire fiber cable is a costly and time-consuming step that should only be taken after confirming the cable is faulty; a power meter test can first determine if the cable is the issue. Option C is wrong because swapping SFP modules is a valid step but should come after verifying the optical power level, as the modules might be functioning correctly and the problem could be elsewhere. Option D is wrong because a loopback test on switch ports tests the switch's port functionality and is not specific to fiber optic link issues; it does not measure optical signal quality and would not diagnose a weak optical signal.

Full explanation →
698
MCQeasy

A customer reports that their Android phone's email app crashes whenever they try to open an attachment from a work email. The app worked fine last week. What is the most likely cause of this issue?

A.The email server is blocking attachments.
B.The email app's cache or data is corrupted.
C.The phone's operating system needs to be updated.
D.The attachment is too large for the phone to handle.
AnswerB

Corrupted cache or app data causes the email client to fail when parsing or rendering attachments, matching the sudden crash after previously working. Clearing the app's cache and data restores normal attachment handling without reinstalling.

Why this answer

The most likely cause is that the email app's cache or data has become corrupted. This corruption can prevent the app from properly processing attachments, even though it worked previously. Clearing the app's cache or data typically resolves such crashes without affecting the email server or requiring an OS update.

Exam trap

CompTIA often tests the distinction between server-side issues (like blocking attachments) and client-side corruption, where candidates mistakenly assume a server problem when the app crashes locally.

How to eliminate wrong answers

Option A is wrong because if the email server were blocking attachments, the issue would likely affect all users or all attachments, not just a single app on one phone, and the app would not crash but rather show an error message. Option C is wrong because an OS update is a broad system change that would cause widespread issues across multiple apps, not a specific crash only when opening attachments in one email app. Option D is wrong because if the attachment were too large, the phone would typically show an error about file size limits or fail to download, not cause the app to crash repeatedly.

Full explanation →
699
MCQeasy

A customer reports that their desktop PC randomly shuts down when playing graphics-intensive games, but runs fine during web browsing. The power supply is a 450W unit. What is the most likely cause of the issue?

A.The CPU thermal paste has dried out, causing overheating only during gaming.
B.The power supply is underrated for the system's peak power draw.
C.The graphics card driver is corrupted, causing system instability.
D.The motherboard capacitors are failing, causing intermittent power loss.
AnswerB

An underrated power supply (PSU) is a common cause for system shutdowns specifically during demanding tasks like gaming. Modern graphics cards and CPUs consume significant power under full load, and if the PSU's maximum wattage output is insufficient to meet the combined peak power draw of all components, its internal over-current or over-power protection circuits will activate. This safety mechanism instantly cuts power to prevent damage, resulting in an abrupt and seemingly random shutdown without warning or error messages, precisely matching the described symptom.

Why this answer

Random shutdowns that occur only under graphics-intensive load strongly indicate the power supply cannot sustain the system's peak power draw. Modern GPUs can spike well above their rated TDP, and a 450W unit is often insufficient once the CPU, GPU, drives, and fans are all under load. During web browsing, power draw stays low, so the PSU never trips its overcurrent or overvoltage protection.

Exam trap

220-1201 often tests whether candidates distinguish PSU overcurrent shutdowns (abrupt, load-dependent) from thermal throttling or driver crashes, which present with different symptoms.

How to eliminate wrong answers

Option A is wrong because dried thermal paste causes gradual thermal throttling and high temperatures, not the abrupt power-off behavior typical of PSU overcurrent protection. Option C is wrong because a corrupted GPU driver produces artifacts, crashes, or blue screens, not a clean instantaneous shutdown. Option D is wrong because failing motherboard capacitors cause intermittent instability across all workloads, not shutdowns specifically tied to high power draw.

Full explanation →
700
MCQeasy

A small office has a network with a single switch and a wireless access point (WAP). Users on the wired network can access the internet, but wireless users cannot. The WAP shows a solid green power LED and a blinking amber activity LED. What is the most likely cause?

A.The WAP is configured with the wrong SSID.
B.The Ethernet cable from the WAP to the switch is faulty or not securely connected.
C.The switch port is configured as a trunk port.
D.The WAP's wireless radio is disabled in the firmware.
AnswerB

A faulty or improperly connected Ethernet cable between the Wireless Access Point (WAP) and the network switch is a common cause of connectivity problems. Such an issue would disrupt the physical layer (Layer 1) communication, preventing the WAP from establishing a stable link with the switch. This often manifests as a blinking amber activity LED on the WAP, indicating link errors, negotiation failures, or a complete loss of physical connectivity. Consequently, wireless clients would be unable to access the wired network or the internet through the WAP.

Why this answer

The solid green power LED indicates the WAP is receiving power, and the blinking amber activity LED typically signals a Layer 1 issue, such as a faulty or loose Ethernet cable. Since wired users have internet access, the switch and upstream connectivity are fine, isolating the problem to the link between the WAP and the switch. A faulty cable prevents the WAP from communicating with the network, so wireless clients cannot reach the internet even though the WAP is powered on.

Exam trap

The 220-1201 exam often tests the distinction between LED indicators (power vs. activity vs. link) to trick candidates into assuming a powered device is fully functional, when in fact the blinking amber LED specifically points to a Layer 1 or Layer 2 issue like a bad cable.

How to eliminate wrong answers

Option A is wrong because an incorrect SSID would still allow the WAP to broadcast a wireless network (users would see a different SSID or none), but the activity LED would not blink amber due to a Layer 1 issue; the WAP would still have a functional Ethernet link. Option C is wrong because a trunk port carries multiple VLANs and would not inherently block wireless traffic; if the WAP expects an access port, a trunk port could cause a VLAN mismatch, but the blinking amber LED points to a physical or data-link problem, not a configuration mismatch. Option D is wrong because if the wireless radio were disabled in firmware, the WAP would not broadcast any SSID, but the activity LED would likely be off or solid green (idle), not blinking amber; the blinking amber LED specifically indicates activity or errors on the Ethernet interface.

Full explanation →
701
MCQeasy

A user reports that their Android tablet frequently crashes when using a specific note-taking app, but other apps work fine. They have already cleared the app cache and data. What should you do next to resolve the issue?

A.Perform a factory reset on the tablet.
B.Uninstall and reinstall the note-taking app.
C.Disable the tablet's antivirus software.
D.Replace the tablet's battery.
AnswerB

Uninstalling an application removes its core files, cached data, and associated settings, often resolving issues caused by corrupted installations or conflicting configurations. Reinstalling the app from a trusted source, like the Google Play Store, ensures that the latest stable version is downloaded, which may include bug fixes or performance improvements addressing the crashing behavior. This process effectively provides a clean slate for the application without affecting other user data or system settings.

Why this answer

Since the issue is isolated to a single app and persists after clearing cache and data, the next logical step is to uninstall and reinstall the app. This replaces the app's APK and all its associated files, eliminating any corrupted installation or misconfigured permissions that clearing data did not fix. A factory reset or hardware replacement is premature when the problem is application-specific.

Exam trap

The 220-1201 exam often tests the candidate's ability to follow a logical troubleshooting hierarchy, and the trap here is that many candidates jump to a factory reset (Option A) as a quick fix, ignoring that the problem is isolated to one app and a less destructive step (reinstall) should be tried first.

How to eliminate wrong answers

Option A is wrong because performing a factory reset is a drastic, last-resort measure that wipes all user data and settings; it is unnecessary when only one app is affected and other apps work fine. Option C is wrong because disabling antivirus software is unlikely to resolve a crash in a specific app unless the antivirus is actively blocking the app's resources, which is rare; the user should first check the app's permissions or logs. Option D is wrong because replacing the tablet's battery addresses power-related hardware issues, not software crashes in a single application.

Full explanation →
702
MCQmedium

A customer complains that their external USB 3.0 hard drive is only transferring files at USB 2.0 speeds (about 30-40 MB/s). They have confirmed the drive supports USB 3.0. What is the most likely cause?

A.The external drive is failing and needs to be replaced.
B.The USB cable is only rated for USB 2.0.
C.The drive is formatted with FAT32, which limits transfer speeds.
D.The computer's USB drivers are outdated.
AnswerB

This is the correct explanation because USB 3.0 (SuperSpeed) requires additional data lines within the cable to achieve its significantly higher transfer rates of up to 5 Gbps. A USB 2.0 cable lacks these extra wires, physically preventing the SuperSpeed data pathways from being utilized, even if both the host port and the device are USB 3.0 compatible. Consequently, the connection defaults to the maximum speed supported by the cable, which is USB 2.0's 480 Mbps.

Why this answer

USB 3.0 requires a SuperSpeed-capable cable with the additional data pairs; a USB 2.0-only cable physically fits the connector but lacks those pairs, so the link negotiates down to High Speed (480 Mbps, ~30-40 MB/s). The drive and port may both be 3.0-capable, but the cable is the bottleneck. Swapping to a certified USB 3.0 (or better) cable restores SuperSpeed throughput.

Exam trap

220-1201 often tests the misconception that filesystem format (FAT32) or drivers cause slow USB transfers, when the physical cable's SuperSpeed pairs are the usual culprit.

How to eliminate wrong answers

Option A is wrong because a failing drive typically produces I/O errors, disconnects, or SMART warnings rather than a clean, consistent fallback to USB 2.0 speeds. Option C is wrong because FAT32 is a filesystem with a 4 GB per-file limit and no journaling, but it does not throttle USB link speed; NTFS or exFAT on the same cable would still run at 2.0 rates. Option D is wrong because outdated drivers usually cause the device to be unrecognized or unstable, not to negotiate a lower but functional USB speed.

Full explanation →
703
MCQeasy

A user wants to securely transfer files to a remote server using a command-line tool. Which port is the default for SFTP (SSH File Transfer Protocol)?

A.21
B.20
C.22
D.990
AnswerC

Port 22 is the standard and correct port for the Secure Shell (SSH) protocol, which SFTP (SSH File Transfer Protocol) leverages to provide secure file transfer capabilities. SFTP encrypts both the authentication credentials and the data being transferred, protecting against eavesdropping and tampering. This integration makes SFTP a robust choice for securely moving files across untrusted networks.

Why this answer

SFTP (SSH File Transfer Protocol) operates over the SSH protocol, which uses TCP port 22 by default. Unlike FTP or FTPS, SFTP does not use separate control and data channels; it encapsulates all file operations within a single encrypted SSH session. This makes port 22 the correct default for SFTP transfers.

Exam trap

CompTIA A+ often tests the distinction between SFTP (port 22) and FTPS (port 990) or standard FTP (ports 20/21), expecting candidates to confuse secure file transfer protocols or to mistakenly associate SFTP with FTP's default ports.

How to eliminate wrong answers

Option A is wrong because port 21 is the default control port for standard FTP (RFC 959), not for SFTP. Option B is wrong because port 20 is the default data port for active mode FTP, used for actual file data transfer, not for SFTP. Option D is wrong because port 990 is the default control port for FTPS (FTP over SSL/TLS, implicit mode), as defined in RFC 4217, not for SFTP.

Full explanation →
704
MCQeasy

A customer reports that their computer with a RAID 5 array is running very slowly during file transfers. The system uses three 1 TB SATA hard drives. The technician runs a diagnostic and finds that one drive has a high number of reallocated sectors. What is the most likely cause of the performance issue?

A.The RAID controller is overheating.
B.One of the drives is failing and the array is operating in degraded mode.
C.The array is configured with the wrong stripe size.
D.The operating system is defragmenting the array.
AnswerB

High reallocated sectors are a critical indicator of a failing hard disk drive, signifying that the drive's firmware is attempting to remap unreadable sectors. When a drive in a RAID array, especially RAID 5 or 6, experiences such failure, the array enters a degraded state. In this mode, the RAID controller must reconstruct missing data using parity from the remaining drives, which significantly increases I/O operations and causes a noticeable performance slowdown.

Why this answer

In a RAID 5 array, if one drive is failing (e.g., high reallocated sectors), the array may still be operational but performance degrades significantly because the controller must reconstruct data on the fly from parity information. This scenario tests understanding of RAID 5 behavior during drive degradation.

Full explanation →
705
MCQhard

A technician is deploying a wireless network in a large warehouse. The warehouse has metal shelving and concrete walls. The technician needs to ensure coverage throughout the area. Which antenna type should be used for the access points to maximize coverage in this environment?

A.Omnidirectional antenna
B.Directional antenna
C.Dipole antenna
D.Rubber duck antenna
AnswerB

Directional antennas concentrate their RF energy into a focused beam, significantly increasing the effective radiated power (ERP) in a specific direction. This focused transmission allows the signal to penetrate dense building materials like concrete and metal more effectively, overcome interference, and achieve longer ranges in targeted areas. This makes them ideal for point-to-point links or covering specific challenging zones within a complex environment.

Why this answer

In an environment with obstacles like metal and concrete, omnidirectional antennas may not penetrate well. Directional antennas can focus the signal in a specific direction, helping to overcome obstacles and extend range. The correct answer is a directional antenna, such as a Yagi or panel antenna.

Full explanation →
706
MCQhard

A technician is troubleshooting a desktop PC that displays a blank screen on boot. The monitor's power LED is on (green), but no image appears. The PC beeps once during startup, and the hard drive activity light flashes. Which component is most likely faulty?

A.The CPU
B.The RAM
C.The video card
D.The monitor's power supply
AnswerC

When a desktop PC emits a single beep, it confirms that the Power-On Self-Test (POST) has successfully initialized critical components such as the CPU, RAM, and motherboard. If the system then fails to display any image, the video card is the most probable culprit. This could be due to a faulty card, improper seating in its expansion slot, or a damaged video cable preventing signal transmission to the monitor.

Why this answer

The single beep and hard drive activity indicate that the POST (Power-On Self-Test) has passed for the CPU and RAM, isolating the issue to the video subsystem. Since the monitor's power LED is green (receiving power) but no image appears, the most likely faulty component is the video card, which is responsible for generating the display signal.

Exam trap

CompTIA often tests the distinction between a POST beep code indicating a non-fatal error (single beep) versus fatal errors (multiple beeps), leading candidates to incorrectly suspect the CPU or RAM when the video card is the actual culprit.

How to eliminate wrong answers

Option A is wrong because a faulty CPU would typically cause no POST beep or a specific beep code (e.g., continuous beeps on some systems), and the hard drive activity light would not flash normally. Option B is wrong because faulty RAM usually triggers a specific beep pattern (e.g., 3 long beeps on AMI BIOS) or a repeating beep code, not a single beep and normal hard drive activity. Option D is wrong because the monitor's power supply is functioning correctly, as indicated by the green power LED; a failed power supply would result in no LED or an amber LED.

Full explanation →
707
MCQmedium

A user complains that their laser printer is printing pages with a vertical black line down the left side of every page. The line appears consistently in the same position regardless of the document printed. What is the most likely cause?

A.The fuser roller has a scratch.
B.The toner cartridge's drum is scratched or has debris.
C.The paper feed rollers are dirty.
D.The printer driver is set to 'economy mode'.
AnswerB

The photosensitive drum, located within the toner cartridge, is the primary component for forming the electrostatic image that attracts toner. If the drum surface is scratched or has debris adhering to it, that specific area will either continuously attract toner (scratch) or prevent toner from adhering (debris). This results in a consistent, sharp vertical line appearing on every printed page, as the defect directly impacts the image creation process before the toner is transferred.

Why this answer

A vertical black line in a fixed position on laser printer output is often caused by a scratch or debris on the photosensitive drum, which picks up toner and transfers it to the paper. The drum is part of the toner cartridge in many printers. Other components like the fuser or transfer roller would cause different patterns.

Full explanation →
708
MCQeasy

A small office uses a single router with a built-in DHCP server. The office has 15 devices that need IP addresses. The router's default subnet mask is 255.255.255.0. How many usable IP addresses are available for devices on this subnet?

A.254
B.255
C.256
D.15
AnswerA

A /24 network, indicated by a subnet mask of 255.255.255.0, allocates 8 bits for host addresses. This provides 2^8, or 256, total possible addresses within that subnet. However, two addresses are always reserved: the network address (where all host bits are zero) and the broadcast address (where all host bits are one). Subtracting these two reserved addresses leaves 254 usable IP addresses for assigning to individual hosts and devices on the network.

Why this answer

The subnet mask 255.255.255.0 corresponds to a /24 prefix, which provides 256 total addresses (2^8). However, the first address (network address) and the last address (broadcast address) are reserved, leaving 254 usable IP addresses for devices. This is a fundamental IPv4 subnetting rule defined in RFC 791.

Exam trap

The 220-1201 exam often tests the distinction between total addresses and usable addresses, trapping candidates who forget to subtract the network and broadcast addresses, leading them to choose 256 instead of 254.

How to eliminate wrong answers

Option B is wrong because 255 is the value of the last octet in the subnet mask, not the number of usable addresses; it also mistakenly includes the broadcast address. Option C is wrong because 256 is the total number of addresses in the subnet, but it fails to subtract the two reserved addresses (network and broadcast). Option D is wrong because 15 is simply the number of devices in the office, which is irrelevant to the total usable addresses available on the subnet.

Full explanation →
709
MCQhard

A user reports that their NFC-enabled smartphone cannot make contactless payments at a terminal that works with other phones. The user has a thick wallet case with metal credit cards. What is the most likely issue?

A.The payment terminal's NFC reader is faulty.
B.The phone's NFC antenna is damaged.
C.The wallet case is interfering with the NFC signal.
D.The phone's payment app is not configured correctly.
AnswerC

Wallet cases, particularly those containing metallic elements like magnetic clasps, RFID-blocking materials, or even multiple credit cards, can significantly interfere with the phone's NFC signal. These materials can absorb or reflect the electromagnetic field required for NFC communication, effectively creating a localized Faraday cage effect that prevents the phone from establishing a connection with the payment terminal.

Why this answer

The thick wallet case with metal credit cards is the most likely cause because metal can block or attenuate the NFC (Near Field Communication) signal, which operates at 13.56 MHz. The case creates a physical barrier that prevents the phone's NFC antenna from establishing the short-range inductive coupling needed for contactless payments, even though the terminal and phone hardware are functional.

Exam trap

The trap here is that candidates may assume the phone's hardware is damaged or the terminal is faulty, overlooking how common accessories like metal cases or credit card holders can physically disrupt the short-range NFC signal.

How to eliminate wrong answers

Option A is wrong because the terminal works with other phones, so its NFC reader is not faulty. Option B is wrong because if the phone's NFC antenna were damaged, the phone would likely fail to make any NFC connections (e.g., pairing with other devices or reading tags), not just payments at a specific terminal. Option D is wrong because the payment app configuration would not be affected by the wallet case; the app would still attempt to communicate, but the signal would be blocked by the metal.

Full explanation →
710
MCQeasy

A technician is setting up a new network printer for a department. The printer needs to be accessible to all users on the same subnet without a dedicated print server. Which configuration method should the technician use?

A.Connect the printer via USB to a user's workstation and share it
B.Assign a static IP address to the printer
C.Use DHCP with a short lease time
D.Install a print server on a domain controller
AnswerB

Assigning a static IP address to the network printer ensures its consistent and reliable presence on the network. This dedicated, unchanging address allows client devices to always locate and connect to the printer directly, simplifying configuration and preventing connectivity issues. A static IP eliminates the risk of the printer's address changing, which would otherwise break established print queues and require manual reconfiguration by users.

Why this answer

Assigning a static IP address to the printer ensures it has a permanent address on the network, allowing all users on the subnet to connect directly. DHCP could change the IP, breaking connections. A static IP is the simplest method for direct network printing without a server.

Full explanation →
711
MCQhard

A technician is troubleshooting a laptop that has a blank screen after the user closed the lid and then reopened it. The laptop's power LED is on, and the fan is spinning. Pressing keys does not wake the display. What should the technician do first?

A.Replace the LCD panel
B.Perform a hard reset by holding the power button for 10-15 seconds
C.Reseat the RAM modules
D.Check the laptop's lid sensor for damage
AnswerB

Performing a hard reset by holding the power button for 10-15 seconds forces the laptop to power down completely, clearing volatile memory (RAM) and resetting the system's current operational state. This action is highly effective for resolving scenarios where the operating system or graphics controller has become unresponsive or 'stuck' in a sleep or low-power state, preventing the display from reactivating after the lid is opened. It is a standard, non-invasive first step for such display issues.

Why this answer

This scenario describes a classic 'lid sensor' or 'display not waking' issue. The laptop is on (power LED, fan), but the display is blank. The first step should be to perform a hard reset by holding the power button to force a shutdown, then power on again.

This can clear a hung state.

Full explanation →
712
MCQhard

A technician is replacing a failed hard drive in a server. The new drive has a SATA III connector, but the server's backplane only supports SATA II. What will be the result of using this drive?

A.The drive will not be recognized
B.The drive will operate at SATA III speeds
C.The drive will operate at SATA II speeds
D.The drive will be damaged
AnswerC

When a SATA III drive is connected to a SATA II backplane, the devices engage in an automatic speed negotiation process during initialization. The drive detects the slower interface and intelligently downshifts its operational speed to match the 3 Gbps (SATA II) capability of the backplane. This ensures stable communication and functionality, albeit at a reduced data transfer rate compared to its maximum potential.

Why this answer

SATA III is backward compatible with SATA II, so the drive will work but at SATA II speeds (3 Gbps). This tests knowledge of SATA generation compatibility and performance limitations. The drive will not be damaged but will not achieve its maximum speed.

Full explanation →
713
MCQhard

A technician is configuring a new router for a branch office. The ISP provides a public IP of 203.0.113.10/30 for the WAN interface. How many usable IP addresses does the technician have for devices on the WAN link?

A.2
B.4
C.6
D.1
AnswerA

This is the correct answer. A /30 subnet mask, which is 255.255.255.252, reserves 30 bits for the network portion. This leaves 2 bits for host addresses, resulting in 2^2 = 4 total IP addresses. From these 4 addresses, one is designated as the network address and another as the broadcast address, leaving exactly two usable IP addresses for host devices, such as the two endpoints of a point-to-point router connection.

Why this answer

A /30 subnet mask (255.255.255.252) provides 4 total addresses: one network, one broadcast, and two usable. This is commonly used for point-to-point WAN links to conserve public IPs.

Full explanation →
714
MCQmedium

A technician needs to connect a new router to a cable modem using an Ethernet cable. The modem has an RJ45 port, and the router has an RJ45 WAN port. Which cable type should be used for this connection?

A.Rollover cable
B.Crossover cable
C.Straight-through cable
D.Fiber optic cable
AnswerC

A straight-through Ethernet cable maintains the same pinout configuration on both ends, meaning pin 1 on one connector connects to pin 1 on the other, pin 2 to pin 2, and so on. This wiring scheme is the standard for connecting devices of different types, where one device's transmit (TX) pins are designed to connect directly to the other device's receive (RX) pins. Therefore, it is the correct choice for linking a modem (Data Communications Equipment) to a router (Data Terminal Equipment) for establishing network connectivity.

Why this answer

A straight-through cable is used to connect devices that operate at different layers of the OSI model, such as a router (Layer 3) to a modem (Layer 2/1). The router's WAN port and the modem's RJ45 port are both MDI-X or auto-MDI/X, but the standard practice for connecting a router to a modem is a straight-through cable because they are dissimilar devices. Modern devices often support auto-MDI/X, but the exam expects the traditional rule.

Exam trap

The trap is overthinking auto-MDI/X and selecting crossover, or confusing rollover (console) with straight-through — candidates often mix up cable types when the devices are dissimilar.

How to eliminate wrong answers

Option A is wrong because a rollover cable is used for console connections to routers/switches via a serial port, not for Ethernet data connections. Option B is wrong because a crossover cable is used to connect similar devices (e.g., switch-to-switch, router-to-router) directly, though auto-MDI/X has made this less critical. Option D is wrong because fiber optic cable is used for high-speed, long-distance connections and requires different transceivers; the modem and router have RJ45 copper ports.

Full explanation →
715
MCQmedium

A company's internal website is accessible by IP address but not by its hostname. The website is hosted on a server with a static IP. Which service is most likely misconfigured?

A.DHCP
B.NAT
C.DNS
D.RADIUS
AnswerC

The Domain Name System (DNS) is a hierarchical and decentralized naming system for computers, services, or other resources connected to the Internet or a private network. Its fundamental purpose is to translate human-readable domain names and hostnames, like 'internal.company.com', into numerical IP addresses, such as '192.168.1.10', which computers use to identify each other on a network. If a company's internal website is accessible by IP address but not by its hostname, it strongly indicates that the corresponding DNS record is either missing, incorrect, or inaccessible, preventing the name-to-IP resolution.

Why this answer

DNS resolves hostnames to IP addresses; if the site works by IP but not by hostname, name resolution is failing, which points to a DNS misconfiguration such as a missing or incorrect A record, wrong zone, or unreachable DNS server. The static IP working confirms the web server and network path are fine, isolating the fault to name resolution.

Exam trap

220-1201 often tests whether candidates can isolate a name-resolution failure from other network services — the trap is choosing DHCP or NAT because they are network-related, when the 'IP works, hostname doesn't' symptom uniquely implicates DNS.

How to eliminate wrong answers

Option A is wrong because DHCP assigns IP addresses and options to clients; a DHCP problem would prevent the client from getting an address at all, not selectively break hostname resolution while IP access works. Option B is wrong because NAT translates private to public addresses for routing; if NAT were broken, IP-based access would also fail, not just hostname access. Option D is wrong because RADIUS handles authentication, authorization, and accounting for network access; it has no role in resolving hostnames to IP addresses.

Full explanation →
716
MCQmedium

A technician is troubleshooting a desktop PC that will not power on. The power supply unit (PSU) has a 24-pin main connector and a 4+4 pin CPU connector. The motherboard has a 24-pin ATX connector and an 8-pin EPS connector. How should the technician connect the CPU power?

A.Connect the 4+4 pin as a 4-pin connector only
B.Use a 6+2 pin PCIe power connector
C.Combine the 4+4 pin into an 8-pin EPS connector
D.Leave the CPU power unconnected
AnswerC

The 4+4 pin connector is specifically engineered as a modular solution to provide the necessary 12V power to the CPU. It consists of two separate 4-pin segments that are designed to snap together, forming a single 8-pin EPS connector. This combined configuration correctly matches the 8-pin EPS power input found on most modern motherboards, ensuring stable and sufficient power delivery for the CPU's operation under various loads.

Why this answer

The 4+4 pin CPU connector can be combined into an 8-pin EPS connector, which matches the motherboard's 8-pin EPS connector. This provides adequate power to the CPU.

Exam trap

220-1201 often tests the confusion between CPU power (EPS) and PCIe power connectors, causing candidates to incorrectly use a PCIe connector for the CPU.

How to eliminate wrong answers

Option A is wrong because connecting only a 4-pin connector may not provide sufficient power for the CPU, especially under high load, and the motherboard has an 8-pin connector. Option B is wrong because a 6+2 pin PCIe power connector is for graphics cards, not CPU power, and has a different pinout. Option D is wrong because leaving the CPU power unconnected will prevent the system from powering on.

Full explanation →
717
MCQmedium

A user's laptop screen has a small crack in the corner, and the display shows lines and discoloration in that area. The rest of the screen works. What is the most cost-effective solution?

A.Replace the entire laptop.
B.Replace the LCD panel.
C.Replace the display cable.
D.Use an external monitor permanently.
AnswerB

A small crack in a laptop screen directly indicates physical damage to the Liquid Crystal Display (LCD) panel itself, which is the component responsible for generating the visual output. Replacing the entire LCD panel is the correct and standard repair procedure for such damage. This involves disassembling the display assembly, carefully removing the damaged panel, and installing a new, compatible replacement to restore full display functionality.

Why this answer

The LCD panel contains the glass substrate and liquid crystal layer that physically cracks, causing localized lines and discoloration. Replacing just the LCD panel (the display assembly) is the most cost-effective solution because it restores full functionality without the expense of a new laptop or the inconvenience of a permanent external monitor. The display cable is unlikely to cause a crack or localized discoloration, as cable damage typically affects the entire screen or causes intermittent issues.

Exam trap

CompTIA often tests the misconception that a cracked screen always requires a full laptop replacement, when in fact the LCD panel is a modular, replaceable component that is far cheaper to swap out.

How to eliminate wrong answers

Option A is wrong because replacing the entire laptop is unnecessarily expensive when only the LCD panel is damaged; the rest of the system is functional. Option C is wrong because the display cable (LVDS or eDP) would not cause a physical crack or localized discoloration; cable faults usually result in no display, flickering, or artifacts across the entire screen. Option D is wrong because using an external monitor permanently negates the portability of the laptop and is not a repair; it is a workaround that does not address the cracked LCD panel.

Full explanation →
718
MCQmedium

You are configuring a dual-monitor setup for a financial analyst. After connecting both monitors, one display shows a distorted, stretched image while the other works perfectly. Both monitors are identical 1920x1080 models. What is the most efficient troubleshooting step?

A.Swap the video cables between the two monitors.
B.Update the graphics driver from the manufacturer's website.
C.Change the resolution of the distorted monitor to 1920x1080 in Windows Display Settings.
D.Replace the monitor with a different model.
AnswerC

A distorted or stretched image on a monitor is a classic symptom of the display being set to a non-native resolution. Most modern monitors have a specific native resolution, such as 1920x1080, at which they display the sharpest, undistorted image. Adjusting the resolution in Windows Display Settings to match the monitor's native resolution will directly correct the aspect ratio and pixel mapping, thereby eliminating the distortion.

Why this answer

The distorted, stretched image on an identical 1920x1080 monitor is the classic symptom of a resolution mismatch — Windows is driving that display at a non-native resolution (commonly 1280x1024 or 1024x768), which the panel then scales to fit, producing the stretch. Setting the resolution back to the native 1920x1080 in Display Settings restores 1:1 pixel mapping and eliminates the distortion. This is the fastest fix because it addresses the actual cause without hardware swaps or driver reinstalls.

Exam trap

220-1201 often tests the assumption that a distorted image means a hardware or driver failure, when the simplest and most common cause is a non-native resolution setting that can be fixed in Display Settings in seconds.

How to eliminate wrong answers

Option A is wrong because swapping cables would only matter if the distortion followed the cable (indicating a bad cable or port), but identical monitors with one working perfectly points to a per-display software setting, not a physical link fault. Option B is wrong because a graphics driver problem would typically affect both monitors or cause artifacts/crashes, not a clean stretched image on only one display. Option D is wrong because replacing the monitor is wasteful and unnecessary — the hardware is functioning correctly; only the resolution setting is misconfigured.

Full explanation →
719
MCQhard

A user reports that their Android tablet's screen flickers when using a specific video streaming app, but the screen is stable in other apps and on the home screen. What hardware component is most likely at fault?

A.The tablet's display panel is failing.
B.The GPU (Graphics Processing Unit) is overheating.
C.The video streaming app has a software bug or codec issue.
D.The tablet's battery is swollen and pressing on the display.
AnswerC

When screen flickering is exclusively observed within a single application, particularly a video streaming app, it strongly points to a software-related problem specific to that application. This could stem from an unoptimized rendering engine, an incompatibility with the device's current operating system version or graphics drivers, or issues with decoding specific video codecs used by the streaming service. Troubleshooting would involve clearing the app's cache, reinstalling it, or checking for app updates.

Why this answer

The screen flickers only within a specific video streaming app, while the home screen and other apps remain stable. This strongly indicates the issue is isolated to software, specifically a bug or codec incompatibility within that app, rather than a hardware failure affecting the entire display or GPU.

Exam trap

The 220-1201 exam often tests the distinction between hardware and software faults by isolating the symptom to a single application, tempting candidates to incorrectly attribute the issue to a failing display panel or GPU when the problem is actually a software bug or codec incompatibility.

How to eliminate wrong answers

Option A is wrong because a failing display panel would cause flickering across all apps and the home screen, not just one app. Option B is wrong because GPU overheating typically causes system-wide graphical artifacts, crashes, or performance throttling across all applications, not flickering limited to a single app. Option D is wrong because a swollen battery pressing on the display would cause persistent physical distortion, pressure marks, or flickering regardless of which app is open, and would not be app-specific.

Full explanation →
720
MCQhard

A security audit reveals that an internal file server is listening on multiple ports, including 137, 138, 139, and 445. The auditor recommends disabling older protocols. Which port is associated with SMB over TCP/IP directly (without NetBIOS)?

A.137
B.139
C.445
D.443
AnswerC

Port 445 is the standard and preferred port for Server Message Block (SMB) communication directly over TCP/IP, without the overhead of NetBIOS. This direct hosting of SMB on TCP/IP allows for more efficient and faster file sharing, printing, and other network services in modern Windows environments. It encapsulates SMB messages directly within a TCP segment, making it the primary port for contemporary file server access.

Why this answer

Port 445 is the correct answer because it is used by Microsoft SMB (Server Message Block) for direct TCP/IP communication without the need for NetBIOS. This is known as SMB over TCP (or SMB Direct), which operates as a transport protocol directly over TCP, bypassing the NetBIOS layer. Ports 137, 138, and 139 are associated with NetBIOS over TCP/IP (NBT), which is the older protocol stack that the auditor recommends disabling.

Exam trap

A common trap in this question is confusing port 139 (NetBIOS-based SMB) with port 445 (direct SMB over TCP). Many candidates incorrectly associate port 443 with file sharing due to its use in HTTPS, but 443 is for secure web traffic, not SMB.

How to eliminate wrong answers

Option A is wrong because port 137 is used for NetBIOS name service (NBNS), which is part of the NetBIOS over TCP/IP suite and not for direct SMB communication. Option B is wrong because port 139 is used for NetBIOS session service, which carries SMB traffic over NetBIOS, not directly over TCP/IP. Option D is wrong because port 443 is used for HTTPS (HTTP over TLS/SSL) and has no relation to SMB or file sharing protocols.

Full explanation →
721
MCQmedium

A user reports that their RAID 5 array with three 2 TB drives is missing one drive in the RAID configuration utility. The technician finds that the missing drive is not detected by the system BIOS. What should the technician do next?

A.Initialize the missing drive in Disk Management.
B.Replace the RAID controller.
C.Check the SATA cable and power connection to the missing drive.
D.Rebuild the array using the remaining two drives.
AnswerC

When a drive is reported as 'missing' from a RAID array, the most common and fundamental cause is a physical disconnection or a power delivery issue. Verifying the SATA data cable ensures proper communication between the drive and the RAID controller, while checking the power connection confirms the drive is receiving the necessary electrical current to spin up and operate. These simple, initial physical checks are the most logical and cost-effective troubleshooting steps before considering more complex hardware failures.

Why this answer

If a drive is not detected in BIOS, the issue is at the hardware level—cable, power, or drive failure. The next step is to check connections. This tests systematic troubleshooting of RAID hardware.

Full explanation →
722
MCQeasy

A home user complains that their internet is extremely slow during peak evening hours, but speed tests show fast results late at night. They have a cable modem connection. What is the most likely cause of this issue?

A.The modem is overheating
B.Bandwidth congestion from neighbors
C.A faulty Ethernet cable
D.The ISP is throttling video streaming
AnswerB

Cable modem segments are shared with neighbours on the same node, so evening peak usage by others consumes the available downstream bandwidth. Late-night tests run fast because that contention disappears, matching the pattern of congestion rather than a fault in the user's own equipment.

Why this answer

Cable internet uses a shared bandwidth model where multiple homes in the same neighborhood connect to a common node. During peak evening hours, increased simultaneous usage from neighbors causes congestion on this shared medium, resulting in slower speeds. Late-night tests are fast because fewer users are active, confirming the issue is contention-based rather than a hardware or throttling problem.

Exam trap

CompTIA A+ often tests the misconception that ISP throttling is the default explanation for slow speeds, but the key differentiator here is the time-based pattern, which points to shared medium congestion rather than selective traffic management.

How to eliminate wrong answers

Option A is wrong because overheating typically causes intermittent disconnections or complete modem failure, not a predictable pattern of slow speeds only during peak hours. Option C is wrong because a faulty Ethernet cable would cause packet loss, link drops, or reduced speed consistently, not just during specific times of day. Option D is wrong because ISP throttling is applied to specific traffic types (e.g., video streaming) regardless of time of day, and would not explain why speed tests themselves are fast late at night.

Full explanation →
723
MCQeasy

A client reports that their new 802.11ac laptop cannot connect to the office Wi-Fi, while older 802.11n devices work fine. The access point is a dual-band model. Which of the following is the MOST likely reason?

A.The laptop's Wi-Fi antenna is damaged.
B.The 5 GHz radio on the access point is disabled.
C.The laptop's drivers are not compatible with 802.11n.
D.The access point is set to 802.11b-only mode.
AnswerB

The 802.11ac standard exclusively operates on the 5 GHz frequency band. If the access point's 5 GHz radio is disabled, the 802.11ac laptop would be unable to detect or connect to the network using its native 802.11ac capabilities. However, older 802.11n devices, which commonly operate on the 2.4 GHz band (and sometimes 5 GHz), would still be able to connect if the 2.4 GHz radio remains active, explaining why other devices work. This scenario perfectly aligns with the problem description.

Why this answer

The 802.11ac standard operates exclusively on the 5 GHz band. While most 802.11ac devices are dual-band and support 2.4 GHz (802.11n/g/b) for backward compatibility, a new 802.11ac laptop might be configured to prioritize or exclusively attempt to connect to the 5 GHz network, or the user might be specifically trying to connect to a 5 GHz SSID. If the access point's 5 GHz radio is disabled, the 802.11ac laptop would be unable to connect to its preferred 5 GHz network.

Older 802.11n clients, which can operate on both 2.4 GHz and 5 GHz, would still be able to connect using the 2.4 GHz radio (which must be active since they are working). This scenario makes the disabled 5 GHz radio the most likely cause for the 802.11ac laptop's inability to connect to the expected Wi-Fi service.

Exam trap

A common trick in exams tests the understanding of 802.11ac's 5 GHz-only operation for its core features, even though 802.11ac *devices* are typically dual-band. The trap here is to consider why an 802.11ac device might fail to connect when 802.11n devices succeed, pointing to a 5 GHz specific issue like a disabled radio, rather than general connectivity problems.

How to eliminate wrong answers

Option A is wrong because a damaged Wi-Fi antenna would affect all wireless connections, not just 802.11ac, and the laptop is new and reported as working elsewhere. Option C is wrong because 802.11ac is backward compatible with 802.11n, and the laptop's drivers would not need to be compatible with the older standard; the issue is the missing 5 GHz band. Option D is wrong because 802.11b-only mode operates on 2.4 GHz and would not prevent an 802.11ac laptop from connecting, as 802.11ac supports 2.4 GHz fallback (though it is not required), and the older 802.11n devices would also likely fail in that mode.

Full explanation →
724
MCQhard

A company deploys a new VoIP system. Users report that calls drop frequently. The network uses a single flat subnet with no QoS configured. The technician monitors traffic and sees high bandwidth utilization during peak hours. What is the most effective solution to improve call quality?

A.Increase the bandwidth of the internet connection
B.Replace all switches with managed switches and enable QoS
C.Change all VoIP phones to use static IP addresses
D.Disable DHCP on the network to reduce broadcast traffic
AnswerB

Managed switches are essential for implementing Quality of Service (QoS) policies, which allow network administrators to prioritize specific types of traffic. By enabling QoS, the network can be configured to give preferential treatment to VoIP packets, ensuring they are processed with minimal delay and packet loss. This prioritization directly mitigates latency and jitter, critical factors for maintaining clear and reliable voice communications.

Why this answer

This question tests knowledge of Quality of Service (QoS) and network segmentation. VoIP traffic is sensitive to latency and jitter. Implementing QoS prioritizes voice traffic over other data, ensuring call quality even during high utilization.

VLANs can also help by separating voice and data traffic.

Full explanation →
725
MCQmedium

A technician is setting up a virtual machine for a developer who needs to test software across multiple OS versions. The VM must have direct access to a USB dongle for licensing. Which VM configuration setting must be enabled?

A.Enable USB 3.0 controller in the VM settings
B.Configure network bridging for the VM
C.Enable USB passthrough and attach the dongle to the VM
D.Install the dongle driver on the host OS
AnswerC

Enabling USB passthrough is the critical step, as it dedicates a physical USB port or a specific USB device from the host directly to the virtual machine. This mechanism allows the VM to bypass the host operating system's USB stack and gain direct, exclusive hardware access to the licensing dongle, treating it as if it were physically connected to the VM itself. Once passthrough is configured, attaching the dongle to the VM ensures the virtualized software can properly detect and validate the physical security key, which is essential for most licensing dongles.

Why this answer

USB passthrough allows the VM to directly access a physical USB device, bypassing the host OS. This is required for devices like dongles that need exclusive access.

Full explanation →
726
MCQhard

A technician is troubleshooting an Android phone that fails to connect to a corporate Wi-Fi network using WPA2-Enterprise with PEAP. The phone connects to other Wi-Fi networks without issue. What is the most likely cause?

A.The Wi-Fi adapter is faulty.
B.The phone's date and time are incorrect.
C.The CA certificate for the network is not installed or trusted.
D.The phone is using a static IP address.
AnswerC

WPA2-Enterprise networks, often utilizing 802.1X with EAP-TLS or PEAP, rely on server-side certificates to authenticate the RADIUS server to the client device. If the Certificate Authority (CA) certificate that signed the RADIUS server's certificate is not installed on the Android phone or is not explicitly trusted by the device, the phone cannot verify the authenticity of the network's authentication server. This prevents the secure handshake required for connection, as the client cannot establish trust with the server and therefore cannot proceed with user authentication.

Why this answer

WPA2-Enterprise with PEAP requires the phone to validate the server's identity using a CA certificate. If the CA certificate is missing or untrusted, the EAP-TLS handshake fails, preventing connection even though the phone can connect to other (non-Enterprise) networks. This is the most common cause of such failures in corporate environments.

Exam trap

The trap here is that candidates confuse PEAP (which requires a server certificate but not a client certificate) with EAP-TLS (which requires both), and incorrectly assume the issue is with the phone's date/time or a faulty adapter, rather than the missing CA certificate needed for the TLS tunnel.

How to eliminate wrong answers

Option A is wrong because the phone connects successfully to other Wi-Fi networks, which proves the Wi-Fi adapter is functional. Option B is wrong because incorrect date/time can cause certificate validation failures, but the question specifies PEAP (not EAP-TLS) and the most likely cause is a missing CA certificate, not a time sync issue; time errors typically affect certificate validity checks but are less common than missing certificates in corporate deployments. Option D is wrong because static IP addressing would affect network-layer connectivity (e.g., DHCP failure), not the 802.1X/EAP authentication phase; the phone would still attempt authentication and fail at a different stage.

Full explanation →
727
MCQhard

A technician is tasked with deploying a virtualized environment for a small office using a single server. The server has 64 GB RAM, two 6-core CPUs, and a RAID 10 array. The technician needs to run four VMs: a domain controller (4 GB), a file server (8 GB), a web server (4 GB), and a database server (16 GB). After deployment, the database server is performing poorly. The technician notices that the hypervisor has allocated 2 virtual CPUs to each VM. Which of the following is the most likely cause of the database server’s poor performance?

A.The RAID 10 array is not fast enough for database I/O.
B.The database server VM should have more virtual CPUs allocated, such as 4 vCPUs.
C.The hypervisor is using a Type 2 hypervisor, causing overhead.
D.The virtual switch is configured for 100 Mbps instead of 1 Gbps.
AnswerB

Database servers are typically CPU-intensive, requiring significant processing power to handle queries, transactions, and data manipulation. Allocating only 2 virtual CPUs (vCPUs) to a database server VM can lead to CPU contention, especially when other VMs are also competing for host CPU cycles. Increasing the vCPU count to 4 or more provides the database server with dedicated processing resources, significantly improving its ability to manage concurrent operations and enhance overall performance.

Why this answer

The database server is a resource-intensive application that often benefits from multiple CPU cores for parallel processing of queries and transactions. Allocating only 2 vCPUs to it, especially when other less demanding VMs also receive 2 vCPUs, makes it highly susceptible to CPU starvation. The server has 12 physical cores, so there is sufficient capacity to increase the database server's vCPU allocation (e.g., to 4 vCPUs) to better match its workload demands and improve performance.

This tests understanding of proper resource allocation in virtualization.

Full explanation →
728
MCQmedium

A technician is troubleshooting a network where several users cannot access the internet, but they can communicate with each other. The network uses a router with IP 10.0.0.1 and a subnet mask of 255.255.255.0. All computers have IPs in the 10.0.0.0/24 range. What is the most likely cause?

A.The DNS server address is set to 10.0.0.1.
B.The subnet mask is incorrectly set to 255.255.0.0 on some computers.
C.The default gateway on the computers is not set to 10.0.0.1.
D.The router's DHCP server is disabled.
AnswerC

The default gateway is the IP address of the router interface that connects the local network to external networks, such as the internet. For a computer to send traffic to any destination outside its immediate local subnet, it must forward those packets to its configured default gateway. If the default gateway is missing or incorrect, local communication will function normally, but all attempts to reach external resources, including the internet, will fail because there is no defined path out of the local network.

Why this answer

Since users can communicate with each other but cannot access the internet, the issue is likely with the default gateway. The router's IP is 10.0.0.1, and the subnet mask is 255.255.255.0, so computers must have their default gateway set to 10.0.0.1 to route traffic outside the local subnet. Without a correct default gateway, packets destined for the internet have no route to the router and are dropped.

Exam trap

The 220-1201 exam often tests the distinction between local connectivity (same subnet) and remote connectivity (different subnet), trapping candidates who confuse DNS or DHCP issues with the fundamental requirement of a default gateway for internet access.

How to eliminate wrong answers

Option A is wrong because setting the DNS server to 10.0.0.1 would not prevent internet access; DNS resolution might fail, but direct IP access would still work, and the symptom is complete loss of internet access, not just name resolution failure. Option B is wrong because if the subnet mask were incorrectly set to 255.255.0.0 on some computers, they would still be able to communicate with each other (since 10.0.0.0/16 includes 10.0.0.0/24) and could potentially reach the internet if the default gateway were correct; the issue here is not subnet mask mismatch. Option D is wrong because a disabled DHCP server would prevent automatic IP assignment, but the question states all computers have IPs in the 10.0.0.0/24 range, meaning they are configured statically or via another method, so DHCP being disabled is irrelevant to the current connectivity problem.

Full explanation →
729
MCQhard

A technician is troubleshooting a laptop that will not charge via its USB-C port. The laptop uses a USB-C power adapter that works with other devices. The technician tests the port with a known-good USB-C flash drive, and it is not detected. What is the most likely issue?

A.The laptop's battery is completely dead and needs replacement.
B.The USB-C port is damaged or has bent pins.
C.The power adapter is not outputting enough wattage.
D.The laptop's BIOS settings have disabled the USB-C port.
AnswerB

Bent or broken pins inside the USB-C receptacle prevent both power delivery negotiation and USB data lanes from connecting, matching the stem's dual failure: no charging plus no flash drive detection. Since the adapter and drive work elsewhere, the fault lies in the laptop's physical port, not the cable, charger or drivers.

Why this answer

Since the known-good USB-C flash drive is also not detected, the issue is not with the power adapter or its wattage. The port's inability to communicate with any USB-C device indicates a physical hardware fault, such as bent or broken pins inside the port, which prevents both power delivery and data transfer.

Exam trap

The trap here is that candidates assume a power adapter that works with other devices must be fine, overlooking that the port itself can be physically damaged, which prevents both power delivery and data communication, not just charging.

How to eliminate wrong answers

Option A is wrong because a completely dead battery would still allow the laptop to power on and detect USB devices when connected to AC power; the battery's health does not affect the port's ability to detect a flash drive. Option C is wrong because the power adapter works with other devices, and insufficient wattage would only affect charging speed or the ability to charge under load, not prevent detection of a data-only USB-C flash drive. Option D is wrong because while BIOS settings can disable a USB-C port, the scenario states the technician tested with a known-good flash drive and it was not detected; a BIOS disable would typically affect all USB-C functionality, but the more common and direct cause given the physical testing is a damaged port, and BIOS settings are rarely the culprit when a port fails to detect any device.

Full explanation →
730
MCQmedium

A user complains that their wireless mouse and keyboard stop working when they move more than 10 feet away from the computer. The devices use a USB dongle. Which network type is being used for these peripherals?

A.Local Area Network (LAN)
B.Wide Area Network (WAN)
C.Personal Area Network (PAN)
D.Metropolitan Area Network (MAN)
AnswerC

A Personal Area Network (PAN) is specifically designed for short-range communication among personal devices, typically within a 10-meter radius. Technologies like Bluetooth (IEEE 802.15.1) and proprietary 2.4 GHz radio frequency (RF) are commonly employed to establish a PAN, enabling devices such as wireless mice, keyboards, headsets, and smartphones to connect directly to a computer or other personal electronic devices. This localized, low-power network type perfectly matches the operational requirements for desktop peripherals.

Why this answer

Personal Area Network (PAN), because wireless mice and keyboards that connect via a USB dongle typically use Bluetooth or a proprietary 2.4 GHz RF protocol, which creates a short-range PAN. The 10-foot range limitation is characteristic of PAN technologies, which are designed for personal device connectivity within a few meters, not for broader network coverage.

Exam trap

The trap here is that candidates confuse the wireless nature of the peripherals with Wi-Fi (a LAN technology), but the short range and personal-device context point specifically to a PAN, not a LAN.

How to eliminate wrong answers

Option A is wrong because a Local Area Network (LAN) covers a larger area like a building or campus and uses protocols such as Ethernet or Wi-Fi, not the short-range RF link used by a wireless mouse/keyboard. Option B is wrong because a Wide Area Network (WAN) spans large geographical areas (e.g., the internet) and relies on technologies like MPLS or leased lines, which are irrelevant to peripheral connectivity. Option D is wrong because a Metropolitan Area Network (MAN) covers a city-sized area and uses technologies like fiber or WiMAX, far exceeding the 10-foot range of a wireless peripheral.

Full explanation →
731
MCQmedium

A technician is setting up a new printer on a network. The printer has a static IP address of 192.168.1.50, but users cannot ping it from their workstations. The workstations are on the 192.168.1.0/24 subnet. What should the technician check first?

A.Check the printer's default gateway setting.
B.Verify the switch port status and cable connection.
C.Change the printer's IP address to a DHCP address.
D.Reboot the router.
AnswerB

Verifying the physical layer components, specifically the switch port status and the integrity of the Ethernet cable, is a crucial first step in troubleshooting network connectivity issues. A faulty or disconnected cable, or a disabled/malfunctioning switch port, will prevent any network communication, regardless of IP configuration. Physical layer problems are frequently the root cause of a device being unreachable, especially when it's a new setup or on the same subnet.

Why this answer

The printer and workstations are on the same 192.168.1.0/24 subnet, so no default gateway is needed for local communication — the gateway only matters for off-subnet traffic. Since the printer has a valid static IP in the same subnet, the most likely cause of failed pings is a physical or Layer 2 issue, such as an unplugged cable, a disabled switch port, or a bad NIC. Verifying the switch port status and cable connection is the correct first troubleshooting step.

Exam trap

The trap here is that candidates see a static IP and immediately suspect IP configuration (gateway, DHCP) rather than recognizing that same-subnet communication bypasses the gateway entirely, making Layer 1/Layer 2 the correct first check.

How to eliminate wrong answers

Option A is wrong because the default gateway is only used to reach hosts outside the local subnet; since the workstations and printer share 192.168.1.0/24, gateway misconfiguration would not block local pings. Option C is wrong because switching to DHCP does not address a physical connectivity problem and would not fix a dead link; it also introduces a new variable (DHCP scope availability) rather than diagnosing the actual fault. Option D is wrong because rebooting the router is a shotgun approach that does not address Layer 1/Layer 2 connectivity between devices on the same subnet, and the router is not even in the path for intra-subnet traffic.

Full explanation →
732
MCQeasy

A customer reports that their internet connection drops frequently during rainstorms. They have a DSL line and a standard modem. Which factor most likely causes this issue?

A.The modem's power supply is failing.
B.Moisture in the copper line causes signal degradation.
C.The customer's router is overheating.
D.The ISP is throttling the connection during storms.
AnswerB

Moisture ingress into compromised insulation or poorly sealed connection points along a DSL copper line significantly alters its electrical characteristics, increasing capacitance and resistance. This impedance mismatch and signal attenuation degrade the signal-to-noise ratio (SNR), making it difficult for the DSL modem to maintain synchronization with the Digital Subscriber Line Access Multiplexer (DSLAM) at the central office, resulting in frequent connection drops specifically during rainy conditions.

Why this answer

DSL operates over copper telephone lines, which are susceptible to moisture ingress during rainstorms. Water in the line increases signal attenuation and introduces impedance mismatches, causing the modem to lose synchronization with the DSLAM. This results in frequent disconnections, as the DSL signal degrades below the threshold required for a stable link.

Exam trap

CompTIA A+ often tests the distinction between environmental factors affecting physical-layer media (like copper DSL) versus logical or device-level issues, tempting candidates to blame the modem or ISP when the root cause is line degradation from moisture.

How to eliminate wrong answers

Option A is wrong because a failing power supply typically causes intermittent power loss or complete shutdown, not disconnections specifically correlated with rainstorms. Option C is wrong because router overheating would cause performance issues or reboots regardless of weather, not exclusively during rain. Option D is wrong because ISPs do not throttle connections during storms; throttling is a deliberate bandwidth management policy unrelated to weather events.

Full explanation →
733
MCQhard

A user wants to use a portable SSD with their tablet for video editing. The tablet has a USB-C port that supports USB 3.1 Gen 2. They need to transfer large files quickly and also charge the tablet simultaneously. Which accessory should they use?

A.A USB-C to USB-C cable
B.A USB-C hub with power delivery pass-through
C.A USB-C to USB-A adapter
D.A wireless SSD with Bluetooth 5.0
AnswerB

A USB-C hub with Power Delivery (PD) pass-through is the ideal solution. It connects to the tablet's single USB-C port, then provides multiple downstream ports. One port can be used to connect the portable SSD, supporting its full USB 3.1 Gen 2 (10 Gbps) speed, while another dedicated USB-C PD port allows an external power adapter to charge the tablet simultaneously, ensuring continuous operation and data integrity.

Why this answer

A USB-C hub with power delivery (PD) pass-through is the correct accessory because it allows the tablet to simultaneously charge via the hub's PD input while providing a dedicated USB-C data port for the portable SSD. USB 3.1 Gen 2 supports up to 10 Gbps, which is sufficient for fast video file transfers, and PD pass-through ensures the tablet's battery is replenished during use. Without PD pass-through, a standard hub would split power and data, potentially starving the tablet of charge.

Exam trap

CompTIA A+ often tests the misconception that a simple cable or adapter can handle simultaneous charging and high-speed data transfer, when in reality a hub with PD pass-through is required to separate the power and data paths on a single USB-C port.

How to eliminate wrong answers

Option A is wrong because a simple USB-C to USB-C cable provides only a single connection, so the tablet cannot be charged while the SSD is connected (unless the tablet supports USB-C alternate mode with power delivery, but the scenario requires simultaneous charging and data transfer, which a single cable cannot achieve without a hub). Option C is wrong because a USB-C to USB-A adapter would downgrade the connection to USB 3.0 (5 Gbps) or slower, losing the 10 Gbps speed of USB 3.1 Gen 2, and it does not provide any charging capability. Option D is wrong because a wireless SSD with Bluetooth 5.0 has a maximum theoretical throughput of only 2 Mbps, which is far too slow for large video file transfers, and it cannot charge the tablet.

Full explanation →
734
MCQhard

A technician is configuring an MFP for a law firm that requires secure printing. Users must enter a PIN at the device to release their print jobs. The MFP supports hard drive encryption and secure print release. Which feature should the technician enable to ensure print jobs are not stored unencrypted on the MFP's hard drive?

A.Secure Print (PIN release)
B.IPsec for network printing
C.Hard drive encryption
D.User authentication via LDAP
AnswerC

Hard drive encryption, often implemented as Full Disk Encryption (FDE) or using self-encrypting drives (SEDs), scrambles all data written to the MFP's internal storage media. This ensures that any print jobs, cached documents, or configuration files stored on the device's hard drive are unreadable without the correct decryption key. Consequently, if the hard drive is physically removed from the MFP or the device is stolen, the sensitive data at rest remains protected and inaccessible to unauthorized parties.

Why this answer

Secure print release only holds jobs until the user enters a PIN, but the data may still be stored on the hard drive. Hard drive encryption ensures that even if the drive is removed, the data is unreadable. Both features together provide comprehensive security.

Full explanation →
735
MCQmedium

A technician is deploying several Android tablets for use as point-of-sale (POS) terminals. The tablets must run a custom POS app in kiosk mode, preventing users from accessing other apps or settings. Which configuration method should the technician use?

A.Enable Developer Options and set the app as the default launcher.
B.Install a third-party launcher and hide all other apps.
C.Use a Mobile Device Management (MDM) solution to configure kiosk mode.
D.Root the tablets and modify the system partition to block other apps.
AnswerC

A Mobile Device Management (MDM) solution is the industry-standard approach for deploying devices in kiosk mode. MDM platforms offer granular control to lock down Android tablets to a single application, preventing users from accessing other apps, system settings, or even physical navigation buttons. This ensures the device serves its intended purpose securely, provides remote management capabilities for updates and troubleshooting, and maintains compliance with organizational policies.

Why this answer

This question tests knowledge of mobile device management (MDM) and kiosk mode deployment. The correct approach is to use an MDM solution to lock the device into a single-app kiosk mode, which is a standard enterprise feature for dedicated devices.

Full explanation →
736
MCQeasy

A technician is setting up internet for a rural home that is 5 miles from the nearest town. The home has no cable TV or phone line. Which internet connection type is most feasible?

A.Cable broadband
B.DSL
C.Fiber optic
D.Satellite
AnswerD

Satellite internet provides connectivity by communicating with geostationary or low-Earth orbit (LEO) satellites via a dish antenna at the customer's location. Its primary advantage is near-universal availability, as it only requires a clear line of sight to the southern sky (for geostationary) or a constellation of satellites (for LEO), making it an ideal solution for remote or rural areas where terrestrial broadband infrastructure is absent. This technology effectively bridges the digital divide for locations far from conventional service providers.

Why this answer

Satellite internet is the most feasible option because the home is 5 miles from the nearest town with no cable TV or phone line infrastructure. Satellite requires only a clear line of sight to the sky, making it independent of terrestrial cabling. Cable broadband, DSL, and fiber optic all depend on physical infrastructure (coaxial cable, twisted-pair copper, or fiber) that does not extend to this remote location.

Exam trap

The trap here is that candidates assume DSL is feasible because it uses phone lines, but they overlook the distance limitation (typically 18,000 feet) and the fact that no phone line exists at the home, making satellite the only viable option.

How to eliminate wrong answers

Option A is wrong because cable broadband requires a coaxial cable connection from a local cable TV provider, which is not available in a rural area 5 miles from town. Option B is wrong because DSL requires a twisted-pair copper telephone line from a central office, and the home has no phone line; even if it did, DSL range is typically limited to about 3 miles (18,000 feet) from the CO. Option C is wrong because fiber optic requires a physical fiber-optic cable run to the premises, which is cost-prohibitive and not available in remote rural areas without existing infrastructure.

Full explanation →
737
MCQeasy

A customer reports that their new desktop PC runs for exactly 30 minutes and then shuts down. After the shutdown, the system won't power back on for several minutes. What is the most likely BIOS/UEFI-related cause of this behavior?

A.The BIOS has a power-on password enabled.
B.The BIOS is set to the wrong CPU multiplier.
C.The BIOS thermal protection feature is triggering due to CPU overheating.
D.The UEFI boot order is set to network boot first.
AnswerC

Modern CPUs and motherboards incorporate sophisticated thermal monitoring and protection mechanisms within the BIOS/UEFI firmware. When the CPU temperature exceeds a predefined critical threshold, the system initiates an emergency shutdown to prevent permanent damage to the processor and other components. The consistent 30-minute runtime strongly suggests it takes that long for the CPU to reach this critical temperature under sustained load, and the subsequent inability to immediately restart indicates a necessary cooldown period before the CPU temperature drops below the safe operating threshold, allowing the system to power on again. This behavior is a classic symptom of CPU overheating.

Why this answer

This scenario describes thermal shutdown protection. The BIOS/UEFI monitors CPU temperature via sensors and will shut down the system to prevent damage if temperatures exceed safe thresholds. The delay before restarting allows the CPU to cool down.

Full explanation →
738
MCQeasy

A customer says their laptop battery no longer charges. The laptop works when plugged into AC power, but the battery icon shows '0% available (plugged in)'. What is the most likely cause?

A.Faulty AC adapter
B.Dead CMOS battery
C.Defective battery
D.Corrupted battery driver
AnswerC

A defective battery is the most direct and common cause when a laptop battery fails to charge, assuming the AC adapter and internal charging circuitry are functional. Internal cell degradation, short circuits, or a failure within the battery's own management system (BMS) can prevent it from accepting a charge. Even if the laptop operates normally on AC power, a physically or electronically compromised battery will refuse to store energy, indicating a hardware failure within the battery itself.

Why this answer

The laptop works on AC power but the battery shows 0% and does not charge, which strongly indicates the battery itself has failed or reached end of life. A defective battery cannot hold a charge, so the system runs only on AC.

Exam trap

220-1201 often tests the misconception that a laptop that works on AC but not battery has an AC adapter issue, when the battery itself is the likely culprit.

How to eliminate wrong answers

Option A is wrong because a faulty AC adapter would prevent the laptop from powering on at all when plugged in, but here it works on AC. Option B is wrong because a dead CMOS battery affects BIOS settings and system clock, not the main battery charging. Option D is wrong because a corrupted battery driver would typically cause the battery to be unrecognized or show errors, but the 0% reading suggests a hardware failure.

Full explanation →
739
MCQhard

A technician is configuring a new database server that needs to accept remote connections from client applications using the default port for MySQL. Which port should be opened in the firewall?

A.1433
B.1521
C.3306
D.5432
AnswerC

Port 3306 is the universally recognized default TCP port for MySQL database connections, facilitating communication between MySQL client applications and the MySQL server daemon. When configuring a new MySQL database server, this port is typically opened in firewalls and specified in client connection strings to allow proper access. Therefore, selecting 3306 is the correct choice for establishing standard connectivity to a MySQL instance.

Why this answer

MySQL's default port for client connections is 3306, so the firewall must allow inbound TCP traffic on that port for remote clients to reach the database server. This is the standard IANA-registered port for MySQL and is used unless the administrator explicitly changes it in the MySQL configuration file. Opening 3306 is the correct action for enabling remote MySQL connectivity.

Exam trap

220-1201 often tests default port numbers for common services, and the trap is confusing MySQL's 3306 with SQL Server's 1433, Oracle's 1521, or PostgreSQL's 5432 — candidates who memorize only one or two ports often pick the wrong one.

How to eliminate wrong answers

Option A is wrong because port 1433 is the default port for Microsoft SQL Server, not MySQL. Option B is wrong because port 1521 is the default port for Oracle Database listener, not MySQL. Option D is wrong because port 5432 is the default port for PostgreSQL, not MySQL.

Each of these ports belongs to a different database platform, and confusing them would result in the firewall allowing the wrong traffic.

Full explanation →
740
MCQeasy

A user reports that their Android phone's battery drains quickly after installing a new social media app. The phone worked fine before. What is the most efficient first troubleshooting step?

A.Uninstall the social media app immediately.
B.Check the app's permissions and disable background activity.
C.Perform a factory reset of the device.
D.Update the phone's operating system.
AnswerB

Many Android applications, especially social media, are designed to run background processes, synchronize data, and send notifications, which can significantly consume battery even when not actively in use. By accessing the app's settings, users can review and disable unnecessary permissions like location access or background data usage, and specifically restrict background activity or optimize battery usage for that particular application. This targeted approach directly addresses common causes of excessive battery drain without removing app functionality entirely.

Why this answer

The most efficient first step is to check the app's permissions and disable background activity because the new social media app is likely consuming battery by running background services (e.g., location polling, push sync, or wake locks). This approach isolates the problem without removing the app, allowing you to confirm the cause before taking further action. It aligns with the CompTIA A+ troubleshooting methodology of identifying the most probable cause first.

Exam trap

The 220-1201 exam often tests the candidate's ability to choose the least invasive, most targeted step first, and the trap here is that many candidates jump to 'uninstall' or 'factory reset' without first using the built-in permission and background activity controls.

How to eliminate wrong answers

Option A is wrong because immediately uninstalling the app is premature; you should first verify that the app is the cause by adjusting its settings, as uninstalling loses the opportunity to gather diagnostic data. Option C is wrong because a factory reset is a drastic, time-consuming step that wipes all user data and should only be attempted after simpler software-level troubleshooting fails. Option D is wrong because updating the OS is a general maintenance step that does not target the specific symptom of battery drain caused by a newly installed app, and it may introduce other variables.

Full explanation →
741
MCQhard

A technician is configuring a wireless network for a high-density environment such as a conference hall. The network must support hundreds of simultaneous connections with minimal interference. Which configuration will best achieve this?

A.Use a single high-power access point to cover the entire hall
B.Deploy multiple access points with reduced transmit power and non-overlapping channels
C.Disable the 5 GHz band to reduce complexity
D.Enable WPS for faster client connections
AnswerB

Deploying multiple access points with reduced transmit power creates smaller, manageable wireless cells, allowing for efficient client load balancing across several devices. Utilizing non-overlapping channels (e.g., 1, 6, 11 for 2.4 GHz, or numerous channels in 5 GHz) minimizes co-channel interference between adjacent APs. This strategy maximizes overall network capacity and provides a robust, high-performance experience for a large number of users.

Why this answer

In a high-density environment like a conference hall, deploying multiple access points with reduced transmit power and non-overlapping channels (e.g., 1, 6, 11 for 2.4 GHz) minimizes co-channel interference and allows efficient frequency reuse, supporting hundreds of simultaneous connections. This design increases overall capacity by creating smaller, manageable cells that reduce contention and improve throughput per client.

Exam trap

The trap here is that candidates often assume higher transmit power always improves coverage and performance, but in high-density environments, it actually increases co-channel interference and reduces overall network capacity.

How to eliminate wrong answers

Option A is wrong because a single high-power access point would cause severe co-channel interference and oversubscription, as all clients contend for the same channel, leading to poor throughput and connectivity issues. Option C is wrong because disabling the 5 GHz band eliminates the use of less congested, higher-capacity channels with more non-overlapping options (e.g., 24 channels), which is critical for high-density environments. Option D is wrong because WPS (Wi-Fi Protected Setup) is a security vulnerability and does not improve connection speed or capacity; it can actually degrade performance due to its weak PIN-based authentication and potential for brute-force attacks.

Full explanation →
742
MCQmedium

A user reports that their laptop can connect to the corporate Wi-Fi but cannot access any network resources. The technician checks the IP configuration and sees an IP address of 192.168.1.105 with a subnet mask of 255.255.255.0 and a default gateway of 192.168.1.1. The technician pings the gateway successfully but cannot ping a server at 192.168.2.10. What is the most likely issue?

A.The laptop's DNS server is misconfigured.
B.The server at 192.168.2.10 is offline.
C.The default gateway does not have a route to the 192.168.2.0 subnet.
D.The laptop's subnet mask is incorrect.
AnswerC

When a laptop attempts to communicate with a device on a different subnet, it sends the traffic to its default gateway. For the communication to succeed, the default gateway must possess a valid routing table entry that specifies how to reach the target 192.168.2.0 network. If this route is missing or incorrect, the gateway will not know where to forward the packets, resulting in them being dropped and the ping failing, even though the laptop can successfully reach the gateway itself.

Why this answer

The technician can ping the default gateway (192.168.1.1) but not the server at 192.168.2.10, indicating that Layer 3 connectivity exists within the local subnet but fails beyond it. This points to a routing issue on the default gateway, which likely lacks a route to the 192.168.2.0/24 network. Without that route, the gateway cannot forward packets destined for the server, even though the laptop's IP configuration is correct.

Exam trap

A common trap in CompTIA A+ is the distinction between local connectivity (pinging the gateway) and remote connectivity (pinging a different subnet) — candidates often assume the server is down or DNS is the problem, but the real issue is a missing route on the default gateway.

How to eliminate wrong answers

Option A is wrong because DNS misconfiguration would cause name resolution failures, not the inability to ping a specific IP address; the technician is pinging by IP, not hostname, so DNS is irrelevant. Option B is wrong because while the server could be offline, the most likely cause given the successful gateway ping and the fact that the server is on a different subnet is a routing problem; the question asks for the 'most likely' issue, and a missing route is more probable than a server failure in this context. Option D is wrong because the subnet mask 255.255.255.0 is correct for the 192.168.1.0/24 network, and the laptop can communicate with the gateway, proving the mask is not the issue.

Full explanation →
743
MCQmedium

A technician is configuring a company-issued Android tablet for a field worker who needs to use a VPN to access internal resources. The tablet connects to the internet via cellular data. After setting up the VPN, the user cannot access any internal websites. What should the technician check first?

A.Verify that the tablet's Wi-Fi is enabled.
B.Check the VPN server address and authentication credentials.
C.Ensure the tablet's date and time are set automatically.
D.Disable the firewall on the tablet.
AnswerB

Incorrect VPN server addresses or authentication credentials are the most frequent culprits for connection failures. The server address directs the tablet to the correct VPN gateway, while accurate credentials, such as username, password, or client certificates, are essential for the VPN server to authenticate the device and establish the encrypted tunnel. Without these precise details, the secure connection cannot be initiated or maintained.

Why this answer

The most common cause of VPN connectivity failure after initial setup is incorrect server address or authentication credentials. Since the tablet connects via cellular data (not Wi-Fi), the VPN must be reachable over the internet; a typo in the server hostname/IP or wrong username/password/PSK will prevent the tunnel from establishing, blocking access to internal resources.

Exam trap

The trap here is that candidates may assume a network-level issue (like Wi-Fi or firewall) is the cause, when the real problem is almost always a misconfigured VPN server address or credentials, especially after a fresh setup.

How to eliminate wrong answers

Option A is wrong because the tablet uses cellular data, not Wi-Fi, so enabling Wi-Fi is irrelevant and would not solve a VPN authentication or server address issue. Option C is wrong because while incorrect date/time can cause certificate validation failures, it is not the first check; the question states the VPN was 'set up' and fails to access internal sites, pointing to a configuration error rather than a time sync issue. Option D is wrong because disabling the tablet's firewall is an extreme step that compromises security; the firewall is unlikely to block outbound VPN traffic by default, and the issue is more likely a misconfiguration of the VPN itself.

Full explanation →
744
MCQmedium

A company wants to connect two office buildings that are 2 miles apart in the same city to share a high-speed internet connection and internal resources. Fiber optic cable is not an option due to cost. Which network type and technology would be most appropriate?

A.LAN using CAT6 Ethernet cable
B.WAN using a satellite link
C.MAN using a point-to-point wireless bridge
D.PAN using Bluetooth
AnswerC

A point-to-point wireless bridge links the two buildings directly over the 2-mile span, forming a MAN without trenching fibre. This satisfies the stem's cost constraint while still delivering high-speed connectivity for shared internet and internal resources.

Why this answer

A MAN (Metropolitan Area Network) using a point-to-point wireless bridge is the most appropriate choice because it connects two buildings within the same city (a metropolitan area) without the high cost of fiber. A wireless bridge operating in the 5 GHz or 60 GHz band can provide high-speed, dedicated links over distances up to several miles, making it ideal for sharing internet and internal resources between the two sites.

Exam trap

The trap here is that candidates often confuse MAN with WAN, assuming any connection between buildings requires a WAN, but a MAN is specifically designed for metropolitan-scale connections like this, and a point-to-point wireless bridge is a cost-effective alternative to fiber.

How to eliminate wrong answers

Option A is wrong because a LAN using CAT6 Ethernet cable is limited to a maximum distance of 100 meters (328 feet) per segment, far short of the 2-mile requirement, and cannot span between separate buildings without additional networking equipment. Option B is wrong because a WAN using a satellite link introduces high latency (typically 500-600 ms due to geostationary orbit distance), which is unsuitable for sharing internal resources and high-speed internet, and is also more expensive and complex than a terrestrial wireless bridge. Option D is wrong because a PAN using Bluetooth has a maximum range of about 10-100 meters and is designed for personal device connectivity, not for connecting two office buildings over 2 miles.

Full explanation →
745
MCQmedium

A technician is configuring a new server and needs to install ECC (Error-Correcting Code) RAM. The motherboard supports both ECC and non-ECC DDR4 memory. The technician installs ECC RAM, but the system boots and reports that ECC functionality is disabled. What is the most likely reason for this?

A.The ECC RAM is not seated properly.
B.The BIOS needs to be updated to enable ECC support.
C.The CPU does not support ECC memory.
D.ECC RAM requires a registered (buffered) type to function.
AnswerC

The CPU contains the integrated memory controller, which is solely responsible for managing and accessing the installed RAM. For ECC (Error-Correcting Code) memory to function, this memory controller within the CPU must specifically support ECC capabilities. Many consumer-grade CPUs lack this feature, even if the motherboard itself has slots for ECC RAM, rendering the ECC functionality of the RAM modules unusable.

Why this answer

ECC functionality requires support at the memory controller level, which is integrated into the CPU on modern platforms. If the CPU does not support ECC, the system will boot with the ECC DIMMs installed but operate in non-ECC mode, reporting ECC as disabled. The motherboard supporting ECC slots is necessary but not sufficient — the CPU and chipset must also support it.

Exam trap

220-1201 often tests the misconception that ECC support is determined solely by the motherboard or the RAM type, when the CPU's integrated memory controller is the actual gating factor.

How to eliminate wrong answers

Option A is wrong because improper seating would typically cause boot failure, memory errors, or the system not POSTing at all — not a clean boot with ECC reported as disabled. Option B is wrong because a BIOS update is not the root cause here; while BIOS settings can toggle ECC, the question states the system already reports ECC disabled, which points to a hardware capability limit rather than a firmware version issue. Option D is wrong because registered (buffered) ECC is a separate characteristic from ECC itself; unbuffered ECC (UDIMM ECC) works on supported platforms without being registered, so registration is not a prerequisite for ECC functionality.

Full explanation →
746
MCQmedium

A company is upgrading its network to support 10 Gbps connections between server racks. The distance between racks is 25 meters. Which cabling standard is most appropriate for this upgrade?

A.Cat5e cable.
B.Cat6 cable.
C.Cat6a cable.
D.Cat7 cable.
AnswerC

Cat6a supports 10GBASE-T across the full 100-metre channel, comfortably covering the 25-metre rack-to-rack span. Cat6 is limited to roughly 55 metres at 10 Gbps, so it would not reliably satisfy the stated distance and bandwidth requirement.

Why this answer

Cat6a cable is the most appropriate choice because it supports 10GBASE-T (10 Gbps) over twisted-pair copper cabling at distances up to 100 meters, which easily covers the 25-meter distance between racks. Cat6a has a bandwidth of 500 MHz, double that of Cat6, and includes improved alien crosstalk (AXT) specifications required for reliable 10 Gbps transmission. This makes it the standard recommendation for 10 Gbps Ethernet in data center environments.

Exam trap

This question tests the common misconception that Cat6 is sufficient for 10 Gbps at any distance. In reality, Cat6 only supports 10 Gbps up to 37-55 meters depending on cable quality, while Cat6a is the standard for reliable 10 Gbps up to 100 meters.

How to eliminate wrong answers

Option A is wrong because Cat5e cable is rated for only 100 MHz bandwidth and supports a maximum of 1 Gbps (1000BASE-T), not 10 Gbps. Option B is wrong because Cat6 cable, while capable of 10 Gbps, is limited to distances of 37-55 meters under 10GBASE-T due to higher insertion loss and alien crosstalk, making it unreliable for consistent 25-meter links in a rack environment. Option D is wrong because Cat7 cable, though it supports 10 Gbps, uses non-standard GG45 or TERA connectors and is not recognized by TIA/EIA standards; it is overkill and not commonly deployed in standard Ethernet networks, making Cat6a the correct industry choice.

Full explanation →
747
MCQhard

A technician is deploying a fleet of tablets that must connect to a corporate network using 802.1X authentication with certificates. After configuring the Wi-Fi profile, some tablets fail to connect. The technician verifies the SSID and security settings are correct. What is the most likely missing configuration?

A.The tablets have the wrong date and time set.
B.The tablets are missing the root CA certificate in their trusted store.
C.The tablets are using WPA2-Personal instead of WPA2-Enterprise.
D.The tablets have a static IP configured that conflicts with the DHCP scope.
AnswerB

For 802.1X authentication using EAP-TLS or PEAP with server-side certificates, the client device (tablet) must validate the identity of the authentication server (e.g., RADIUS server). This validation requires the client to possess the root Certificate Authority (CA) certificate that signed the server's certificate, or an intermediate CA certificate whose chain leads back to a trusted root. Without this crucial root CA in its trusted store, the tablet cannot verify the authenticity of the server's certificate, leading to a failed secure handshake and preventing connection to the network.

Why this answer

802.1X authentication using EAP-TLS requires the client to validate the server's certificate against a trusted root CA. If the root CA certificate is missing from the tablet's trusted store, the client cannot verify the RADIUS server's identity, causing the EAP-TLS handshake to fail. This is the most likely issue since the SSID and security settings are already confirmed correct.

Exam trap

The 220-1201 exam often tests the distinction between authentication failures due to missing root CA versus certificate expiration or date/time issues, trapping candidates who assume a simple time sync problem when the real issue is a missing trust anchor.

How to eliminate wrong answers

Option A is wrong because an incorrect date/time would cause certificate validity errors (e.g., 'not yet valid' or 'expired'), but the question states the Wi-Fi profile is correctly configured and the tablets fail to connect—date/time issues typically produce a different error message and are less common than missing root CA. Option C is wrong because WPA2-Personal uses a pre-shared key, not certificates; the scenario explicitly requires 802.1X with certificates, so using WPA2-Personal would be a fundamental security mismatch, not a 'missing configuration' after verifying security settings. Option D is wrong because a static IP conflict would cause IP-layer connectivity issues after association, but 802.1X authentication occurs at Layer 2 before IP assignment; the tablets would fail to even associate if the 802.1X handshake fails, making IP configuration irrelevant at this stage.

Full explanation →
748
MCQmedium

A technician is setting up a new office network with 50 devices. The network must support growth up to 100 devices. The technician chooses a subnet mask of 255.255.255.0. How many usable host addresses does this subnet provide?

A.254
B.255
C.256
D.128
AnswerA

A /24 subnet mask (255.255.255.0) indicates that the first 24 bits are used for the network portion, leaving 8 bits for host addresses. With 8 host bits, there are 2^8 = 256 possible IP addresses within that subnet. However, the first address (all host bits zero) is reserved as the network address, and the last address (all host bits one) is reserved as the broadcast address. Therefore, 256 - 2 = 254 usable host addresses remain for devices.

Why this answer

A /24 subnet mask (255.255.255.0) leaves 8 host bits, giving 2^8 = 256 total addresses. Subtracting the network address and the broadcast address leaves 254 usable host addresses. This comfortably supports the current 50 devices and the planned growth to 100 devices.

Exam trap

220-1201 often tests the off-by-one confusion between total addresses (2^h) and usable hosts (2^h − 2), so candidates who forget to subtract the network and broadcast addresses pick 256 or 255.

How to eliminate wrong answers

Option B is wrong because 255 would only result if you subtracted just one reserved address, but both the network and broadcast addresses must be excluded. Option C is wrong because 256 is the total address count including the network and broadcast addresses, not the usable host count. Option D is wrong because 128 corresponds to a /25 subnet (255.255.255.128), which would only provide 126 usable hosts and would not meet the 100-device growth requirement.

Full explanation →
749
MCQhard

A user wants to connect a laptop to a 4K projector for a presentation. The laptop has a USB-C port that supports DisplayPort Alt Mode, and the projector has an HDMI input. Which cable or adapter is required?

A.USB-C to USB-C cable
B.HDMI to HDMI cable
C.USB-C to HDMI adapter or cable
D.DisplayPort to HDMI cable
AnswerC

This is the correct solution because modern USB-C ports often support DisplayPort Alternate Mode (Alt Mode), which allows them to output video signals. A USB-C to HDMI adapter or cable actively converts the DisplayPort Alt Mode signal from the laptop's USB-C port into a standard HDMI signal. This enables seamless video transmission to the projector's HDMI input, effectively bridging the differing port types and signal protocols.

Why this answer

USB-C with DisplayPort Alt Mode carries a DisplayPort signal over the USB-C connector, so a USB-C to HDMI adapter (or cable) converts that DP signal to HDMI for the projector. This is the correct single-cable solution because the laptop's USB-C port natively outputs video via Alt Mode. A passive USB-C to HDMI cable or an active adapter both work as long as they support DP Alt Mode.

Exam trap

The trap is confusing the direction of conversion or assuming any USB-C cable works for video; candidates must recognize that USB-C video output requires DP Alt Mode support and an adapter to match the projector's HDMI input.

How to eliminate wrong answers

Option A is wrong because a USB-C to USB-C cable carries USB data or DP Alt Mode signals but cannot connect to an HDMI input on the projector without conversion. Option B is wrong because the laptop has no HDMI output — only USB-C — so an HDMI-to-HDMI cable has nothing to plug into on the laptop side. Option D is wrong because the laptop does not have a native DisplayPort connector; while USB-C Alt Mode carries DP signals, a DisplayPort-to-HDMI cable has a full-size DP plug that will not fit the USB-C port.

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750
MCQmedium

A technician is configuring a small office network with 15 computers and a single router. The router's WAN port is connected to a cable modem, and the LAN port is connected to a switch. All computers are connected to the switch. The technician assigns the router's LAN interface the IP 192.168.0.1/24. What should be the default gateway setting on each computer?

A.The IP address of the cable modem.
B.192.168.0.1
C.The IP address of the switch.
D.192.168.0.255
AnswerB

In a typical small office or home network, 192.168.0.1 is a common default IP address assigned to the router's internal (LAN) interface. This IP address functions as the default gateway for all client devices on the local network, enabling them to forward traffic destined for external networks, such as the internet, through the router. Without this gateway, local devices would be unable to communicate beyond their immediate subnet.

Why this answer

The default gateway is the router's LAN interface IP address because it is the next-hop device that forwards traffic from the local subnet to external networks. Since the router's LAN interface is configured as 192.168.0.1/24, all computers on the 192.168.0.0/24 subnet must use that address as their default gateway to reach the internet via the cable modem.

Exam trap

The 220-1201 exam often tests the misconception that the default gateway should be the IP of the cable modem or the switch, confusing the roles of Layer 2 and Layer 3 devices in a simple SOHO network.

How to eliminate wrong answers

Option A is wrong because the cable modem operates at Layer 2 (bridging) and does not have a routable IP on the LAN side; computers send traffic to the router, not the modem. Option C is wrong because a switch is a Layer 2 device and does not perform routing; it has no IP address that can serve as a default gateway in this scenario. Option D is wrong because 192.168.0.255 is the broadcast address for the 192.168.0.0/24 subnet, which cannot be assigned as a gateway and is used only for sending packets to all hosts on the local network.

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