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CompTIA A+ Core 1 220-1201 (220-1201) — Questions 751–825

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

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751
MCQhard

A technician is called to a home where the customer reports that their cable internet works fine, but the TV service has pixelated channels. The technician suspects a signal issue. What is the most appropriate tool to measure the signal strength and quality on the coaxial line?

A.A tone generator and probe
B.A multimeter
C.A cable tester (signal level meter)
D.An optical time-domain reflectometer (OTDR)
AnswerC

A cable tester designed for RF signals can measure signal strength and quality on coaxial lines.

Why this answer

A cable tester (signal level meter) is the correct tool because it measures both signal strength (in dBmV) and signal quality (SNR or MER) on a coaxial line, which directly diagnoses pixelation caused by poor signal levels or noise. The technician needs to verify that the RF signal from the cable provider meets the required thresholds (typically -10 to +10 dBmV for downstream) to ensure clear TV reception.

Exam trap

Cisco often tests the distinction between tools used for RF coaxial signals versus fiber optics, leading candidates to confuse an OTDR (fiber) with a cable tester (coaxial) when the scenario clearly involves a cable TV service.

How to eliminate wrong answers

Option A is wrong because a tone generator and probe is used to trace and identify specific coaxial cables, not to measure signal strength or quality. Option B is wrong because a multimeter measures DC voltage, resistance, or continuity, but cannot measure RF signal levels or modulation quality on a coaxial line. Option D is wrong because an OTDR is designed to test fiber optic cables by measuring light loss and reflections, not coaxial RF signals.

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752
MCQhard

A technician is setting up a small office network with a router, a switch, and a wireless access point. The router has only one LAN port. The technician needs to connect the switch and the WAP to the router, but the switch has no uplink port. Which hardware component should the technician use to connect both devices to the router?

A.Use a crossover cable to connect the router directly to the WAP.
B.Connect the router to the switch, then connect the WAP to the switch.
C.Use a hub between the router and the switch.
D.Configure the switch as a router to connect to the WAP.
AnswerB

A switch expands the number of ports, allowing both the WAP and other devices to connect to the router through a single link.

Why this answer

This question tests knowledge of network topology and the use of additional switches. Since the router has only one LAN port, a switch is needed to expand the number of available ports. The correct answer is to connect the router to the switch, and then connect the WAP to the switch.

The switch's ports are typically all the same, so no special uplink port is required (modern switches use Auto-MDIX).

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753
MCQmedium

A user reports that their computer is running very slowly and they hear a repetitive clicking sound from the case. The technician checks the SMART status of the primary hard drive and sees a 'Reallocated Sectors Count' value that is critically high. What should the technician do next?

A.Run a disk defragmentation to improve performance.
B.Back up all important data immediately.
C.Replace the SATA cable and power connector.
D.Disable the paging file to reduce disk activity.
AnswerB

The high reallocated sectors count is a strong indicator of impending drive failure. Backing up data is the critical first step to prevent data loss.

Why this answer

A high reallocated sectors count indicates the drive is failing and likely to suffer data loss. The priority is to back up critical data immediately, then replace the drive. Continuing to use the drive risks permanent data loss.

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754
MCQhard

A technician is deploying tablets for use in a warehouse where workers wear gloves. The tablets need to be used for scanning barcodes and entering data. Which accessory is most critical for this environment?

A.A screen protector.
B.A Bluetooth keyboard.
C.A rugged case.
D.A capacitive stylus.
AnswerC

A rugged case provides drop protection and seals against dust, which is critical in a warehouse environment where tablets may be dropped or exposed to debris.

Why this answer

In a warehouse environment where workers wear gloves, the most critical accessory is a rugged case because it protects the tablet from drops, dust, and moisture common in industrial settings. While gloves prevent capacitive touchscreen use, a rugged case does not solve input issues but ensures device survival; however, the question asks for the most critical accessory for the environment, and without rugged protection, the tablet would fail quickly. The correct answer is C because it directly addresses the physical hazards of the warehouse, which are more fundamental than input method challenges.

Exam trap

CompTIA often tests the misconception that input method accessories (like a stylus or keyboard) are most critical in glove-wearing environments, but the exam emphasizes that device survival via rugged protection is the primary concern before usability can be considered.

How to eliminate wrong answers

Option A is wrong because a screen protector offers minimal protection against drops and impacts, and does not address the primary environmental hazards of a warehouse. Option B is wrong because a Bluetooth keyboard requires a flat surface and is impractical for mobile barcode scanning while standing or moving, and it does not solve the glove issue for direct touch input. Option D is wrong because a capacitive stylus requires a capacitive touchscreen and does not work with gloves unless the gloves are specifically designed for capacitive touch, which is not stated; moreover, a stylus is less efficient for rapid barcode scanning than a dedicated scanner.

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755
MCQmedium

A user has a 27-inch 1440p monitor connected via DisplayPort. They report that text appears slightly blurry and images look less sharp than expected. The monitor's native resolution is set correctly in Windows. What should you check first?

A.Replace the DisplayPort cable with an HDMI cable.
B.Adjust the monitor's sharpness setting from the on-screen display (OSD) menu.
C.Enable and recalibrate ClearType in Windows.
D.Set the monitor to a lower resolution to see if text improves.
AnswerC

ClearType is specifically designed to improve text clarity on LCD screens; disabling it causes blurriness.

Why this answer

Blurry text at the correct native resolution often means ClearType (Windows font smoothing) is disabled or misconfigured. ClearType improves text clarity on LCD monitors by sub-pixel rendering. Enabling or recalibrating ClearType in Control Panel typically resolves the issue.

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756
MCQeasy

During a desktop build, you install a new M.2 NVMe SSD into the M.2 slot. When you power on the system, the BIOS does not detect the drive. The SSD is known to be working. What is the most likely motherboard-related cause?

A.The M.2 slot is SATA-only and the drive is NVMe
B.The CMOS battery needs replacement
C.The motherboard BIOS is corrupted
D.The CPU is not seated properly
AnswerA

Some M.2 slots only support SATA protocol; an NVMe drive will not be detected in such a slot.

Why this answer

Many motherboards share PCIe lanes between M.2 slots and SATA ports. Installing an M.2 NVMe drive often disables certain SATA ports, but the drive itself should still be detected if properly seated. The most common oversight is not checking the motherboard manual for M.2 slot compatibility or lane sharing.

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757
MCQmedium

A user reports that they cannot access a website hosted on a remote server. The technician finds that the firewall allows HTTP and HTTPS traffic, but the website uses a non-standard port. The user's browser shows 'connection refused'. Which tool can the technician use to verify if the remote port is open?

A.Ping
B.Telnet
C.Nslookup
D.Tracert
AnswerB

Telnet can connect to a specific port to verify if it is open and listening.

Why this answer

Telnet can be used to test connectivity to a specific port (e.g., telnet example.com 8080). Ping uses ICMP, not TCP ports. Nslookup tests DNS resolution.

Tracert traces the route but does not test port status.

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758
MCQhard

A technician is tasked with connecting a legacy parallel port printer to a modern motherboard that lacks a parallel port header. The motherboard has an LPT header (25-pin) but it is not populated with a bracket. What is the best way to add a parallel port?

A.Install a USB-to-parallel adapter
B.Use a PCIe parallel port expansion card
C.Purchase an LPT bracket that connects to the motherboard header
D.Solder wires directly to the motherboard's LPT header pins
AnswerC

This bracket provides the physical port using the motherboard's built-in parallel port header, which is the most direct and cost-effective solution.

Why this answer

The LPT header on the motherboard provides the necessary signals for a parallel port. A bracket with a ribbon cable that connects to this header is the correct solution. A USB-to-parallel adapter would work but may have compatibility issues and is not the best use of the existing header.

A PCIe parallel card is an alternative but unnecessary if the header is present.

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759
MCQmedium

During a motherboard replacement, a technician installs a new CPU but the system fails to POST. The CPU fan spins, but the screen remains blank. Which of the following should the technician check first?

A.Check if the CPU power connector is plugged in
B.Reseat the RAM modules
C.Verify the CPU is on the motherboard's supported CPU list and update BIOS if needed
D.Replace the CMOS battery
AnswerC

Many motherboards require a BIOS update to support newer CPUs; checking compatibility is the first logical step.

Why this answer

When a system fails to POST with a new CPU, the most common issue is compatibility or improper installation. The technician should verify the CPU is supported by the motherboard's BIOS version.

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760
MCQeasy

A technician is setting up a new multifunction printer for a department. The device supports duplex printing, but the driver installation wizard does not show the duplex option. Users need to print on both sides of the paper. What should the technician do first?

A.Update the printer firmware to the latest version.
B.Check if the duplex unit is installed and properly connected.
C.Reinstall the printer driver using the manufacturer's full driver package.
D.Configure the duplex setting in the printer's web interface.
AnswerB

If the duplex unit is not physically installed or connected, the driver will not show the duplex option. This is the first step in troubleshooting.

Why this answer

The duplex unit is often a separate accessory that must be physically installed and enabled in the driver. The most logical first step is to verify the hardware is present and properly connected, as the driver may not detect it automatically.

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761
MCQeasy

A customer reports that their new all-in-one printer can scan and copy locally, but they cannot send scanned documents to their email address. The printer is connected to the office network and can ping other devices. Which protocol is most likely misconfigured on the printer?

A.FTP
B.IMAP
C.SMTP
D.SNMP
AnswerC

SMTP is the protocol used to send outgoing email, making it the likely misconfigured protocol here.

Why this answer

The printer can scan and copy locally and is reachable on the network (ping works), but it cannot send scanned documents to an email address. This indicates the printer is configured to use SMTP (Simple Mail Transfer Protocol) to send the email, but the SMTP server settings (server address, port, authentication, or encryption) are likely incorrect or missing. SMTP is the standard protocol for sending outgoing email, which is exactly what the printer needs to deliver the scanned document as an email attachment.

Exam trap

The trap here is that candidates might confuse IMAP (used to read email) with SMTP (used to send email), especially when the question involves an email-related function like scanning to email.

How to eliminate wrong answers

Option A is wrong because FTP (File Transfer Protocol) is used for transferring files to/from a server, not for sending emails; the printer would use FTP only if it were configured to upload scans to an FTP server, not to email. Option B is wrong because IMAP (Internet Message Access Protocol) is used for retrieving and managing emails from a mail server, not for sending emails; the printer needs to send, not receive, email. Option D is wrong because SNMP (Simple Network Management Protocol) is used for network management and monitoring (e.g., querying printer status or traps), not for email transmission.

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762
MCQmedium

A technician is replacing a power supply in a server that has been experiencing random lockups. The old PSU is an 80+ Bronze rated 650W unit. The technician selects an 80+ Gold rated 650W unit from the same brand. What is the primary benefit of this upgrade?

A.The Gold-rated PSU provides more wattage to the components.
B.The Gold-rated PSU produces less heat and is more efficient.
C.The Gold-rated PSU has better voltage regulation and ripple suppression.
D.The Gold-rated PSU will automatically fix the random lockups.
AnswerB

Higher efficiency means less energy is lost as heat, which improves thermal performance and may reduce fan noise.

Why this answer

80+ Gold certification indicates higher efficiency (87-90% at typical loads) compared to Bronze (82-85%). This means less power is wasted as heat, which can improve reliability in a server environment and reduce cooling costs.

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763
MCQeasy

A customer complains that their external USB hard drive is not recognized when plugged into any port on their laptop. The drive spins up and its LED lights up. The drive works fine on another computer. What is the most likely issue?

A.The USB port is physically damaged.
B.The external drive's enclosure has a faulty controller board.
C.The laptop is missing or has corrupted USB mass storage drivers.
D.The USB cable is defective.
AnswerC

If the USB mass storage driver is missing or corrupted, the laptop will provide power to the device but will not be able to enumerate it, so it will not appear in the OS. This explains why the drive spins up but is not recognized.

Why this answer

This question tests basic USB troubleshooting. The drive spins up and lights up, indicating power is reaching it, but it is not recognized. This often points to a driver issue on the laptop.

The other options are less likely because the drive works on another computer and the LED is on.

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764
MCQeasy

A customer reports that their laptop can connect to the internet at home via Wi-Fi, but at a coffee shop it cannot connect to the guest network. They have not changed any settings. Which network type is most likely causing this issue?

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

The coffee shop's guest Wi-Fi is a LAN that the laptop is trying to join; the issue is likely with that LAN's configuration, not the internet (WAN).

Why this answer

Option B (LAN) is correct because the coffee shop's guest network is a Local Area Network (LAN) that the laptop must join via Wi-Fi. Since the laptop works at home but not at the coffee shop, the issue is likely with the LAN configuration—such as a mismatched SSID, security type (e.g., WPA2 vs. WPA3), or IP address assignment (DHCP) on that specific LAN.

The user's unchanged settings may not be compatible with the coffee shop's LAN setup.

Exam trap

The trap for this question is that many candidates think a guest network is a WAN because it provides internet access, but the coffee shop's Wi-Fi is still a LAN, and the issue is with local network configuration.

How to eliminate wrong answers

Option A is wrong because a Personal Area Network (PAN) covers short-range connections like Bluetooth or USB, not Wi-Fi-based internet access at a coffee shop. Option C is wrong because a Wide Area Network (WAN) connects geographically dispersed networks (e.g., the internet itself), not the local Wi-Fi network at a coffee shop; the issue is with local connectivity, not WAN routing. Option D is wrong because a Metropolitan Area Network (MAN) spans a city or large campus, not a single coffee shop's guest Wi-Fi, which is a localized LAN.

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765
MCQhard

A technician is troubleshooting a smartphone that cannot connect to any Wi-Fi network. The technician has already verified that the device's Wi-Fi adapter is enabled and that other devices can connect to the same networks. What should the technician check next?

A.Check if the device has a static IP address configured.
B.Check the device's MAC address filter on the router.
C.Check if the device's date and time are correct.
D.Check if the device's Bluetooth is interfering.
AnswerA

A static IP that is incorrect or conflicts with other devices can prevent Wi-Fi connectivity. The technician should check the IP settings in the Wi-Fi configuration.

Why this answer

A static IP address can prevent a device from obtaining a valid IP from the DHCP server, causing connection failure. This is a common issue when a device has been manually configured with an IP that is not in the network's range or is already in use.

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766
MCQmedium

A user reports that their laptop screen flickers intermittently, especially when the lid is moved. The flickering stops when an external monitor is connected. What is the most likely cause?

A.The graphics driver is outdated.
B.The inverter board is failing.
C.The display cable is loose or damaged.
D.The LCD panel is failing.
AnswerC

Movement of the lid stresses the internal display cable. A loose or damaged connection causes flickering only on the built-in screen.

Why this answer

Intermittent flickering when moving the lid points to a loose or damaged display cable (LVDS or eDP) connecting the motherboard to the screen. The external monitor works because it bypasses this internal connection.

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767
MCQmedium

A user's smartphone intermittently disconnects from a known Wi-Fi network when they move to a different room. The network uses a single access point. What is the most likely cause?

A.The smartphone is connecting to the 5 GHz band, which has poor wall penetration.
B.The access point is overloaded with too many clients.
C.The smartphone's MAC address is being filtered.
D.The smartphone's battery saver mode is turning off Wi-Fi.
AnswerA

5 GHz has shorter range and is more easily blocked by walls, leading to intermittent disconnects when moving rooms.

Why this answer

The 5 GHz band offers higher data rates but has significantly poorer wall penetration and range compared to the 2.4 GHz band. When the user moves to a different room, the signal from the single access point attenuates more rapidly at 5 GHz, causing intermittent disconnections. This is the most likely cause because the problem is location-dependent and occurs with a known network.

Exam trap

The 220-1201 exam often tests the misconception that 5 GHz is always superior, leading candidates to overlook its range and penetration limitations in favor of blaming client-side settings like battery saver or MAC filtering.

How to eliminate wrong answers

Option B is wrong because an overloaded access point would cause slow speeds or connection failures for all clients regardless of location, not intermittent disconnects only when moving to a different room. Option C is wrong because MAC address filtering would either permanently allow or block the device, not cause intermittent disconnections based on location. Option D is wrong because battery saver mode typically turns off Wi-Fi only when the screen is off or the device is idle, not when actively moving between rooms with the screen on.

Full explanation →
768
MCQhard

A user reports that their cloud-based application is running slowly, and the IT team discovers that the application is hosted in a different geographic region than the user. Which cloud concept is most directly affecting performance?

A.Bandwidth
B.Elasticity
C.Latency
D.Fault tolerance
AnswerC

Latency is the delay in data transmission, which increases with geographic distance between user and cloud server.

Why this answer

This scenario tests understanding of latency in a global cloud context. When an application is hosted far from the user, the physical distance increases network latency, causing slow performance. Bandwidth could be a factor but is not directly tied to geographic distance, while elasticity and fault tolerance are unrelated to the location of the host.

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769
MCQmedium

A technician is deploying 50 company-owned Android tablets for field workers. The tablets must only run a single custom business app and prevent users from accessing any other apps or settings. Which configuration method should the technician use?

A.Enable 'Developer options' and set the app as the default launcher.
B.Use a Mobile Device Management (MDM) solution to configure kiosk mode.
C.Perform a factory reset and install only the custom app.
D.Remove the Google Play Store app from the device.
AnswerB

Correct. MDM can enforce kiosk mode, locking the device to a single app and blocking other functions.

Why this answer

A Mobile Device Management (MDM) solution with kiosk mode is the correct approach because it locks the device to a single app, disables access to system settings, and prevents users from launching other applications. MDM enforces this via device policy controllers (DPC) and Android's lock task mode, which cannot be bypassed by the user. This meets the requirement of deploying 50 tablets with a single custom business app and no access to other apps or settings.

Exam trap

The 220-1201 exam often tests the misconception that simply removing the Play Store or performing a factory reset is sufficient for locking down a device, when in reality only MDM-enforced kiosk mode provides the necessary system-level restrictions to prevent user access to other apps and settings.

How to eliminate wrong answers

Option A is wrong because enabling 'Developer options' and setting the app as the default launcher does not prevent users from accessing settings or other apps; they can still swipe down the notification shade, open the app drawer, or use the back button to exit. Option C is wrong because performing a factory reset and installing only the custom app does not restrict the user from installing additional apps or accessing system settings; the device remains fully functional with standard Android UI. Option D is wrong because removing the Google Play Store app does not block access to other pre-installed apps, system settings, or sideloaded apps; users can still use file managers, browsers, or other built-in apps.

Full explanation →
770
MCQmedium

A technician is troubleshooting a laptop that cannot connect to a 5 GHz Wi-Fi network, but it connects to 2.4 GHz networks without issue. The laptop supports dual-band Wi-Fi. What is the most likely cause?

A.The 5 GHz router is too far from the laptop.
B.The laptop's Wi-Fi driver is outdated or misconfigured for 5 GHz.
C.The 5 GHz network is using WEP encryption.
D.The laptop's Wi-Fi card is only 2.4 GHz capable.
AnswerB

An outdated driver may not properly support 5 GHz channels or band steering, causing connection failures.

Why this answer

Since the laptop connects successfully to 2.4 GHz networks but fails on 5 GHz, the hardware is functional for 2.4 GHz, but the driver or configuration may not support the 5 GHz band properly. An outdated or misconfigured Wi-Fi driver is the most likely cause because it can fail to enable the 5 GHz radio or negotiate 802.11a/n/ac protocols correctly.

Exam trap

CompTIA often tests the misconception that a dual-band laptop always works on both bands equally, but the trap here is that driver or configuration issues can selectively disable one band, leading candidates to incorrectly blame range (A) or encryption (C).

How to eliminate wrong answers

Option A is wrong because if the 5 GHz router were too far, the laptop would still see the network (though with weak signal) or fail to connect due to range, but the symptom is a complete inability to connect to 5 GHz while 2.4 GHz works fine—range issues affect both bands, not selectively. Option C is wrong because WEP encryption is not band-specific; if the laptop supports WEP (which is deprecated but still functional on many adapters), it would affect both 2.4 GHz and 5 GHz connections equally, not just the 5 GHz band. Option D is wrong because the question explicitly states the laptop supports dual-band Wi-Fi, meaning the Wi-Fi card is capable of both 2.4 GHz and 5 GHz; a 2.4 GHz-only card would not connect to any 5 GHz network at all, but the symptom here is a failure to connect to a specific 5 GHz network, not a hardware limitation.

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771
MCQmedium

A technician is troubleshooting a network drop that was working yesterday but now has no link light at the switch. The cable run is 80 meters and passes through a conduit. Which tool should be used first to isolate the problem?

A.A tone generator and probe.
B.A multimeter.
C.A cable tester.
D.A time-domain reflectometer (TDR).
AnswerC

A cable tester can check for continuity, shorts, and wiring faults, which is the first step in diagnosing a no-link issue.

Why this answer

Option C is correct because a cable tester (often a wiremap tester) is the first tool to use when verifying basic connectivity and physical layer issues like broken wires, shorts, or miswiring. Since the link light is absent and the cable was working before, the most likely cause is a physical fault in the 80-meter run, and a cable tester can quickly confirm continuity and pinout without requiring advanced diagnostics.

Exam trap

The trap here is that candidates often jump to a TDR (Option D) because they think of distance-to-fault for a long run, but the question asks for the first tool to isolate the problem, and a simple cable tester is faster and more appropriate for verifying basic connectivity before using specialized equipment.

How to eliminate wrong answers

Option A is wrong because a tone generator and probe is used for tracing and identifying cables within a bundle or locating a specific cable in a patch panel, not for testing electrical continuity or faults that cause a missing link light. Option B is wrong because a multimeter can measure voltage, resistance, and continuity but cannot test for proper twisted-pair wiring, crosstalk, or impedance mismatches that affect Ethernet signaling at 80 meters. Option D is wrong because a time-domain reflectometer (TDR) is used to locate the distance to a fault (e.g., a break or short) but is an advanced tool typically employed after a cable tester confirms a fault exists; using it first is overkill and less efficient for initial troubleshooting.

Full explanation →
772
MCQhard

A technician is troubleshooting a slow network connection for a user. The user's computer has an IP address of 192.168.1.100, subnet mask 255.255.255.0, and default gateway 192.168.1.1. The technician runs a ping to the gateway and gets replies with times around 2ms. However, pinging a server at 192.168.1.200 results in times over 500ms. The technician checks the switch and finds that the port for the user's computer is set to 10 Mbps half-duplex, while the computer's NIC is set to auto-negotiation. What is the most likely cause of the high latency?

A.The server at 192.168.1.200 is overloaded.
B.The user's computer has a faulty network cable.
C.There is a duplex mismatch between the switch port and the NIC.
D.The default gateway is misconfigured.
AnswerC

The switch port is set to 10 Mbps half-duplex, while the NIC is auto-negotiating. This often results in a mismatch where the NIC runs at half-duplex, causing collisions and high latency.

Why this answer

The switch port is manually configured to 10 Mbps half-duplex, while the computer's NIC is set to auto-negotiation. When one side is hard-coded and the other is set to auto-negotiation, the auto-negotiating side will detect the speed (10 Mbps) but fall back to half-duplex as a default, resulting in a duplex mismatch. This mismatch causes frame collisions and retransmissions, dramatically increasing latency (500+ ms) while local pings to the gateway remain low because the gateway is on the same switch and not affected by the mismatch.

Exam trap

A common trap in CompTIA A+ is that a duplex mismatch causes high latency but not necessarily packet loss, leading candidates to incorrectly suspect a faulty cable or overloaded server, when the real issue is the mismatch between manual and auto-negotiation settings.

How to eliminate wrong answers

Option A is wrong because an overloaded server would cause high latency for all clients, not just this user, and the ping to 192.168.1.200 from this user shows 500+ ms while other users would likely also experience issues; the problem is isolated to this user's connection. Option B is wrong because a faulty network cable typically causes packet loss, intermittent connectivity, or no link at all, not consistently high latency with successful pings; the cable is passing traffic reliably. Option D is wrong because the default gateway is correctly configured (192.168.1.1) and pinging it returns 2 ms, proving the gateway is reachable and not misconfigured; the issue is with the path to the server, not the gateway.

Full explanation →
773
MCQeasy

You are upgrading a customer's gaming PC to support faster memory. The motherboard supports DDR4-3200, but after installing two 8GB DDR4-3200 modules, the system only runs at 2133 MHz. What is the most likely reason?

A.The RAM modules are defective
B.The motherboard does not support dual-channel memory
C.XMP is not enabled in the BIOS
D.The CPU does not support DDR4-3200
AnswerC

XMP must be enabled to run RAM above the default JEDEC speed; this is a common configuration step.

Why this answer

By default, most motherboards run RAM at a standard JEDEC speed (often 2133 MHz) for stability. To achieve the rated speed of 3200 MHz, you must enable XMP (Extreme Memory Profile) in the BIOS. This is a common step that new builders overlook.

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774
MCQhard

A technician is setting up a mobile workstation for a graphic designer who uses a laptop with a USB-C port that supports Thunderbolt 3. The designer needs to connect two 4K monitors, a wired Ethernet connection, and charge the laptop simultaneously. Which accessory should the technician choose?

A.A USB-C to dual HDMI adapter
B.A Thunderbolt 3 docking station
C.A USB 3.0 hub with HDMI and Ethernet
D.A KVM switch
AnswerB

Thunderbolt 3 docks offer high bandwidth, dual 4K support, Ethernet, and power delivery, meeting all requirements.

Why this answer

A Thunderbolt 3 docking station is the correct choice because it provides sufficient bandwidth (up to 40 Gbps) to drive two 4K monitors simultaneously, includes a dedicated Ethernet port for wired networking, and delivers power delivery (PD) to charge the laptop—all through a single USB-C connection that is backward-compatible with Thunderbolt 3.

Exam trap

CompTIA often tests the misconception that any USB-C adapter or hub can support dual 4K displays and charging, but only a Thunderbolt 3 docking station provides the necessary bandwidth and power delivery capabilities for this specific combination of requirements.

How to eliminate wrong answers

Option A is wrong because a USB-C to dual HDMI adapter typically relies on DisplayPort Alternate Mode and may not support two 4K displays at 60 Hz simultaneously due to bandwidth limitations (USB 3.1 Gen 2 caps at 10 Gbps), and it lacks an Ethernet port. Option C is wrong because a USB 3.0 hub with HDMI and Ethernet operates at USB 3.0 speeds (5 Gbps), which is insufficient for dual 4K video streams and cannot deliver the power needed to charge the laptop. Option D is wrong because a KVM switch is designed to share a single set of peripherals between multiple computers, not to add video outputs or Ethernet connectivity to a single laptop.

Full explanation →
775
MCQhard

A technician is troubleshooting an impact printer that is producing faint characters on multipart forms. The ribbon is new, and the print head is clean. The forms are properly aligned. Which adjustment should be made?

A.Increase the print head temperature
B.Replace the platen
C.Adjust the platen gap to bring the print head closer to the paper
D.Change the paper thickness setting to a thicker setting
AnswerC

Reducing the gap increases the force of the pins on the paper, ensuring clear impressions through all layers of the multipart form.

Why this answer

Faint characters on multipart forms with a new ribbon and clean print head indicate insufficient impact force. Impact printers have a platen gap adjustment that controls the distance between the print head and the platen. If the gap is too wide, the pins cannot strike through all layers effectively.

Full explanation →
776
MCQhard

A technician is configuring a network for a new branch office. The branch has 50 users and needs to access resources at the main office via a secure tunnel over the internet. Which service is required to establish this connection?

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

VPN creates an encrypted tunnel over the internet for secure communication between sites.

Why this answer

A VPN (Virtual Private Network) is required to create a secure, encrypted tunnel over the internet between the branch office and the main office. This allows the 50 users to access internal resources at the main office as if they were on the same local network, using protocols such as IPsec or SSL/TLS to ensure confidentiality and integrity of data in transit.

Exam trap

A common misconception is that NAT alone can provide security or remote access, but NAT only modifies address headers and does not encrypt traffic or authenticate users, making VPN the correct choice for secure tunneling.

How to eliminate wrong answers

Option A is wrong because DHCP (Dynamic Host Configuration Protocol) is used to automatically assign IP addresses and other network configuration parameters to devices on a local network, not to establish secure connectivity between remote sites. Option B is wrong because DNS (Domain Name System) resolves human-readable domain names to IP addresses, but does not provide encryption or tunneling for secure remote access. Option D is wrong because NAT (Network Address Translation) translates private IP addresses to a public IP address for internet access, but it does not create a secure tunnel or authenticate remote users; it is often used alongside VPNs but is not the service that establishes the secure connection.

Full explanation →
777
MCQeasy

A user reports that their desktop PC emits a series of short beeps and fails to boot. The monitor shows no display, and the keyboard and mouse LEDs are off. What is the most likely cause?

A.Faulty power supply unit
B.Loose or faulty RAM module
C.Defective hard drive
D.Overheated CPU
AnswerB

Short beep patterns are a standard BIOS indicator for memory errors, and reseating or replacing RAM often resolves the issue.

Why this answer

A series of short beeps during POST typically indicates a memory (RAM) failure. The lack of display and peripheral response points to a hardware fault that prevents the system from completing POST, and RAM is the most common culprit.

Full explanation →
778
MCQmedium

A technician is configuring a cloud-based backup solution for a client's critical data. The client requires that data be stored in a way that allows quick recovery of individual files from any point in the last 30 days. Which cloud storage model is most appropriate?

A.Block storage
B.File storage
C.Object storage
D.Cold storage
AnswerC

Object storage stores data as objects with metadata and supports versioning, allowing recovery of previous file versions.

Why this answer

Object storage is ideal for storing and retrieving individual files with versioning capabilities, enabling point-in-time recovery. It is scalable and commonly used for backup. Block storage is for raw volumes, and file storage is for shared file systems, but object storage offers the best granularity for file-level recovery over time.

Full explanation →
779
MCQmedium

A user complains that a virtual machine running on a laptop shuts down unexpectedly when the laptop is unplugged from power. The host has power management settings set to 'Balanced'. What is the most likely cause?

A.The VM's virtual BIOS is set to power off on AC loss
B.The host's power plan is set to 'Balanced', causing the host to sleep when unplugged
C.The VM is configured with insufficient RAM
D.The laptop's battery is failing and cannot supply power
AnswerB

A 'Balanced' power plan may put the host to sleep after a period on battery, which shuts down the VM abruptly.

Why this answer

Power management settings can put the host to sleep or reduce performance, causing the VM to crash or shut down. The VM relies on the host's power state; changing the plan to 'High Performance' prevents sleep.

Full explanation →
780
MCQmedium

A small office has a single public IP address and uses a router to provide internet access to 20 devices. Users report that some websites load slowly or time out, while others work fine. The router's NAT table shows many entries. Which protocol is most likely being exhausted, causing these intermittent issues?

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

NAT table exhaustion prevents new outbound connections, causing timeouts for some sites while others work.

Why this answer

The router's NAT table has many entries, indicating that the single public IP address is being heavily used to translate private IPs for 20 devices. When the NAT table exhausts its available port mappings (typically 65,535 per public IP, but often limited by router resources), new outbound connections cannot be established, causing some websites to time out while existing connections continue to work. This is a classic symptom of NAT overload (PAT) exhaustion.

Exam trap

The trap here is that candidates confuse NAT exhaustion with DNS failure, but DNS would cause all sites to fail, whereas NAT exhaustion causes intermittent failures as the table fills and empties.

How to eliminate wrong answers

Option A is wrong because DNS resolves domain names to IP addresses; if DNS were exhausted or failing, all websites would fail to load, not just some intermittently. Option B is wrong because DHCP assigns IP addresses to devices; if DHCP were exhausted, devices would fail to obtain an IP address entirely, not experience intermittent slow loading. Option D is wrong because ICMP is used for diagnostic tools like ping and traceroute; ICMP exhaustion would affect those tools, not general web browsing.

Full explanation →
781
MCQmedium

A user reports that their VoIP phone works but the connected PC cannot access the network. The phone is connected to the wall jack, and the PC is connected to the phone's passthrough port. What is the most likely cause?

A.The PC's network cable is faulty.
B.The VoIP phone's passthrough port is disabled.
C.The switch port is not configured for the data VLAN, so the PC cannot get an IP address.
D.The PC's network adapter is set to a static IP address that conflicts with the phone.
AnswerC

Correct. VoIP phones often use separate VLANs. If the switch port only allows the voice VLAN, the PC's traffic is blocked. Configuring the port for both VLANs resolves this.

Why this answer

The VoIP phone and PC share a single physical switch port via the phone's passthrough port. For the PC to access the network, the switch port must be configured as a trunk (or access port with voice VLAN) carrying both the voice VLAN (for the phone) and the data VLAN (for the PC). If the switch port is not configured for the data VLAN, the PC will not receive an IP address from the DHCP server and cannot communicate on the network, even though the phone works because it uses its own voice VLAN.

Exam trap

Cisco often tests the misconception that a working phone implies the entire port is correctly configured, when in fact the phone can operate on its own voice VLAN even if the data VLAN is missing or misconfigured, leaving the PC stranded.

How to eliminate wrong answers

Option A is wrong because a faulty PC cable would typically cause a link light issue or complete loss of connectivity, but the scenario states the phone works (which uses the same physical cable from the wall jack) and the PC is connected via the phone's passthrough port, so the cable from the wall is fine. Option B is wrong because if the passthrough port were disabled, the PC would have no link at all, but the question implies the PC cannot access the network (likely no IP address) rather than a physical disconnection. Option D is wrong because a static IP conflict with the phone would cause an IP address conflict error on the PC, not a failure to obtain an IP address; the phone typically uses a separate voice VLAN and does not compete for the same subnet as the PC.

Full explanation →
782
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 prioritizes VoIP traffic to maintain call quality by reducing latency and jitter.

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.

Full explanation →
783
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

A /26 subnet provides 62 usable hosts, which is sufficient for 50 devices and minimizes waste.

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

Cisco often tests the ability to calculate the smallest subnet that meets host requirements, and the trap here is that candidates may choose a mask that provides exactly 50 usable addresses (like /27 with 30 addresses) without accounting for the 2 reserved addresses (network and broadcast), or they may overestimate and pick a /24 mask out of habit.

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.

Full explanation →
784
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's double parity and the large 4 TB drives mean the rebuild must read all remaining drives and write parity, which is I/O intensive and slow.

Why this answer

RAID 6 uses double parity, requiring more calculations during rebuild. Additionally, large-capacity drives (4 TB) take longer to rebuild because the entire drive surface must be read and written. The rebuild process also competes with normal I/O, slowing it further.

Full explanation →
785
MCQeasy

A user is setting up a new monitor that uses a DisplayPort connection, but their desktop PC only has an HDMI port. They have an adapter. Which adapter type will allow the monitor to display correctly?

A.HDMI to VGA adapter
B.HDMI to DisplayPort adapter
C.DisplayPort to USB-C adapter
D.DVI to HDMI adapter
AnswerB

HDMI and DisplayPort use similar digital signaling, so a passive adapter can convert the signal for the monitor.

Why this answer

The correct answer is B because DisplayPort and HDMI are both digital video standards, and a passive adapter can convert between them without signal loss. This tests knowledge that DisplayPort and HDMI are electrically compatible for video, unlike VGA (analog) or USB-C (which may require active conversion).

Full explanation →
786
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

VLAN tagging on virtual switch port groups isolates traffic between VMs while sharing the same physical interface.

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.

Full explanation →
787
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, often allowed by ISPs.

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.

Full explanation →
788
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

A damaged or dirty port can cause intermittent connections; cleaning or replacing the port is the logical next step.

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.

Full explanation →
789
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

DNS resolves hostnames to IP addresses. Since the customer can access resources by IP but not by hostname, DNS is misconfigured or not resolving local names.

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.

Full explanation →
790
MCQmedium

During a routine hardware upgrade, you need to replace a power supply in a desktop that has a non-modular PSU. After disconnecting all cables, you notice the old PSU has a 20+4 pin main connector, but the new PSU has a 24-pin main connector. The motherboard has a 24-pin socket. What should you do?

A.Use the 20+4 pin connector from the old PSU on the new motherboard
B.Connect the new PSU's 24-pin connector directly to the motherboard
C.Remove the 4-pin section from the new PSU's 24-pin connector to make it 20-pin
D.Use a 24-pin to 20-pin adapter
AnswerB

The 24-pin connector is designed for modern motherboards and will fit securely, providing proper power.

Why this answer

A 24-pin connector is compatible with a 24-pin motherboard socket; the extra 4 pins are integrated. The 20+4 pin design was for backward compatibility with older 20-pin boards. No adapter is needed.

Full explanation →
791
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

A Wi-Fi hotspot (tethering) creates a local Wi-Fi network that the laptop can join to use the tablet's cellular data connection.

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.

Full explanation →
792
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

Correct. Power outages can reset BIOS settings, so the boot order may need to be corrected to prioritize the SSD.

Why this answer

After a power outage, the boot order in BIOS can reset to defaults, causing the system to try booting from the wrong drive. This tests understanding of BIOS/UEFI boot settings.

Full explanation →
793
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 allows a VM to directly use a physical PCIe device, which is essential for the proprietary card.

Why this answer

Direct access to physical hardware like a PCIe card requires hardware passthrough technology, such as Intel VT-d or AMD IOMMU. This allows a VM to directly control the device without going through the hypervisor. The correct answer tests knowledge of advanced virtualization features for hardware compatibility.

Full explanation →
794
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 damaged part; replacing it restores touch functionality at the lowest cost.

Why this answer

Option C is correct because 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 →
795
MCQeasy

A small office has a multifunction printer that supports duplex printing. Users complain that when they select 'Print on Both Sides' from their application, the printer still prints single-sided. The printer driver is installed correctly. What should you check first?

A.Ensure the printer has enough paper in the tray.
B.Check the printer driver's default duplex setting and change it to 'Print on Both Sides'.
C.Replace the network cable.
D.Update the printer firmware to the latest version.
AnswerB

If the driver default is set to single-sided, it will override the application's duplex selection.

Why this answer

This scenario tests understanding of printer driver settings vs. application settings. Duplex printing must be enabled in both the printer driver properties and the application's print dialog. The driver default setting often overrides application choices if not set properly.

Full explanation →
796
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 TDR is specifically designed to measure cable length by analyzing signal reflections, making it ideal for this task.

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.

Full explanation →
797
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 connecting drives, the array must be created and initialized in the RAID controller's utility before the OS can see it.

Why this answer

RAID 5 requires a minimum of three drives. The drives are detected individually, so the issue is with the RAID configuration itself. The most common oversight is failing to initialize the array in the RAID controller BIOS.

Full explanation →
798
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

If the system tries to boot from an old drive or network, it will fail if the OS is only on the new SSD.

Why this answer

If the boot order is not set to the new SSD, the system may try to boot from another drive or nothing, causing the error. The SSD itself is likely fine, and cables are usually detected if properly connected.

Full explanation →
799
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

192.168.1.0/24 is a private range that provides 254 usable addresses, ideal for a small office with 30 devices.

Why this answer

Option C (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 →
800
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

Reverting to a snapshot taken while the VM was running can restore an inconsistent file system state, leading to a kernel panic on boot.

Why this answer

Taking a snapshot of a running VM captures the state of the virtual disk and memory, but if the file system is in an inconsistent state (e.g., during a write operation), reverting to that snapshot can cause corruption. The correct answer identifies that the snapshot was taken at an inopportune time, leading to file system inconsistency.

Full explanation →
801
MCQmedium

A company has a network with multiple VLANs. A user in VLAN 10 cannot access a server in VLAN 20, but other users in VLAN 10 can access the server. The technician checks the switch configuration and finds that the port for the user is set to access mode for VLAN 10. What should be configured to allow this user to reach the server?

A.Change the user's port to trunk mode
B.Configure a static route on the user's computer
C.Enable inter-VLAN routing on the router or Layer 3 switch
D.Assign the user's port to VLAN 20
AnswerC

Inter-VLAN routing allows traffic to pass between different VLANs; without it, devices in separate VLANs cannot communicate.

Why this answer

The user in VLAN 10 cannot reach the server in VLAN 20 because they are in different subnets. Even though the switch port is correctly configured for VLAN 10, traffic between VLANs requires a Layer 3 device (router or Layer 3 switch) to perform inter-VLAN routing. Enabling this on the router or Layer 3 switch allows the user's packets to be forwarded from VLAN 10 to VLAN 20.

Exam trap

A common misconception is that simply placing devices in the same VLAN or using trunk ports enables cross-VLAN communication, but in fact a Layer 3 routing process is required.

How to eliminate wrong answers

Option A is wrong because changing the user's port to trunk mode would allow multiple VLANs on that port, but the user's device is not configured for trunking (802.1Q) and would not understand tagged frames, breaking connectivity. Option B is wrong because configuring a static route on the user's computer only affects the local routing table; the user's default gateway is in VLAN 10, and without inter-VLAN routing on the network infrastructure, the server in VLAN 20 remains unreachable. Option D is wrong because assigning the user's port to VLAN 20 would move the user into the server's VLAN, but the user would lose access to resources in VLAN 10 and likely have IP addressing issues since their IP is still in the VLAN 10 subnet.

Full explanation →
802
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 automatically assigns IP configuration; if the laptop's DHCP client is disabled or misconfigured, it won't get a usable IP address, causing no internet.

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 →
803
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

HDMI 1.4 is limited to 4K at 30Hz, so this is the maximum the laptop can output.

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 →
804
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

If the switch is off, no power flows to the system. This is the quickest and easiest check before proceeding with hardware testing.

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 →
805
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

Port forwarding maps the public IP and port to the server’s private IP, allowing internet users to reach it.

Why this answer

For a server on a private IP to be accessible from the internet, the router must have port forwarding configured to direct incoming traffic to the server’s private IP. Without it, requests to the public IP are dropped.

Full explanation →
806
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

A charged, updated device ensures stable configuration without power loss or update interruptions.

Why this answer

This question tests understanding of device preparation for deployment. Before any software configuration, you must ensure the device has a full charge and is updated to avoid interruptions. Kiosk mode is set via software after the device is ready.

Full explanation →
807
MCQhard

A technician is configuring a small office network and needs to assign a static IP address to a printer. The technician pings the intended IP address and gets no reply, but the printer still fails to communicate after configuration. Which tool should be used to verify that no other device on the network is using that IP address?

A.Ping -t
B.arp -a
C.ipconfig /all
D.Netstat -r
AnswerB

arp -a displays the ARP table, which lists IP addresses and their associated MAC addresses, helping confirm if the IP is already assigned to another device.

Why this answer

The `arp -a` command displays the current ARP cache, which maps IP addresses to MAC addresses on the local network. If another device is already using the intended IP address, its MAC address will appear in the ARP cache for that IP, confirming a conflict. This is the correct tool because it directly shows which MAC address is associated with the IP, even if the device does not respond to ping (e.g., due to firewall rules).

Exam trap

A common misconception is that a successful ping (or lack of reply) is sufficient to verify IP availability, when in fact ARP is the definitive tool to detect IP conflicts because it works even when ICMP is blocked.

How to eliminate wrong answers

Option A is wrong because `ping -t` only sends continuous ICMP echo requests and checks for a reply; it does not reveal the MAC address of the responding device, so it cannot confirm whether another device is using the IP if that device blocks ICMP. Option C is wrong because `ipconfig /all` displays the local machine's own IP configuration, not the IP-to-MAC mappings of other devices on the network. Option D is wrong because `netstat -r` shows the local routing table, which lists network destinations and gateways, not the IP-to-MAC address associations needed to detect an IP conflict.

Full explanation →
808
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

A power meter measures signal strength, helping to identify if the signal is too weak due to attenuation, which cleaning alone cannot fix.

Why this answer

Dirty connectors are a common cause of fiber issues, but if cleaning doesn't resolve it, the next step is to verify the light level using a power meter. This will determine if the signal is strong enough or if there is attenuation from other causes like bends or damaged cables.

Full explanation →
809
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

Correct. Clearing the app's cache or data often resolves crashes caused by corrupted temporary files.

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 →
810
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

A 450W PSU is often too low for a gaming PC; under load, the system may exceed the PSU's capacity, causing shutdowns.

Why this answer

This scenario tests understanding of power supply wattage requirements under load. Graphics-intensive gaming draws more power, and if the PSU cannot supply enough sustained wattage, the system may shut down to protect itself. A 450W unit is often insufficient for a gaming GPU, especially if the system has multiple drives or high-end components.

Full explanation →
811
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 disconnected Ethernet cable would prevent the WAP from communicating with the switch, causing the activity LED to blink amber (indicating errors) and no internet access for wireless users.

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

Cisco 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 →
812
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

Reinstalling the app ensures the latest version is installed and can fix corrupted app files or compatibility issues.

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 →
813
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

Using a USB 2.0 cable with a USB 3.0 device will limit the transfer speed to USB 2.0 rates.

Why this answer

If a USB 3.0 device is plugged into a USB 2.0 port or a cable that only supports USB 2.0, it will fall back to slower speeds. The cable or port is the most common bottleneck. Driver issues are less likely, and the drive itself is not faulty.

Full explanation →
814
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

SFTP uses SSH on port 22 for secure file transfer.

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 →
815
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

Correct. High reallocated sectors indicate a failing drive, forcing the RAID controller to use parity for reads, slowing performance.

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 →
816
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 focus the signal in a specific direction, allowing better penetration through obstacles and longer range in targeted areas.

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 →
817
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

With POST passed and no display, the video card or its connection is the most likely fault.

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 →
818
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

A damaged drum will attract toner along the scratch, creating a consistent vertical line on every page.

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 →
819
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

Correct. A /24 network has 256 total addresses minus 2 reserved addresses equals 254 usable addresses.

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

Cisco 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 →
820
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

Metal objects in the case create a Faraday cage effect, blocking the NFC field required for payment.

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 →
821
MCQmedium

A technician is troubleshooting a desktop that powers on but displays nothing on the monitor. The monitor is on and connected via HDMI. The technician hears one short beep from the motherboard speaker. What should the technician do next?

A.Replace the RAM modules
B.Test the monitor on another computer
C.Reseat the graphics card
D.Flash the BIOS
AnswerC

A single beep means POST passed, so the most likely cause is a loose or faulty GPU.

Why this answer

One short beep typically indicates a successful POST, meaning the CPU, RAM, and motherboard are likely functional. The issue is therefore probably with the display subsystem: the video card or its connection. The technician should reseat the GPU or try a different video output port.

Full explanation →
822
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

A static IP ensures the printer is always reachable at the same address on the subnet, enabling direct printing.

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 →
823
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

A hard reset can resolve a system that is stuck in a sleep state or has a hung graphics controller. This is a standard first step for blank screen after lid closure.

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 →
824
MCQmedium

A technician is troubleshooting a desktop that beeps three times repeatedly and shows a blank screen upon power-on. The system has a discrete GPU installed and two sticks of RAM. What is the most likely cause indicated by the beep code?

A.The discrete GPU is not seated properly.
B.The CPU has failed or is overheating.
C.The RAM is faulty or not properly installed.
D.The BIOS battery is dead.
AnswerC

Three beeps are a common AMI BIOS code for a memory error; the technician should reseat, test one stick at a time, or replace the RAM.

Why this answer

Beep codes are used by the BIOS/UEFI to indicate hardware errors during POST. Three beeps typically indicate a memory (RAM) error. The technician should reseat or test the RAM sticks individually to isolate the faulty module.

Full explanation →
825
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

The drive will negotiate down to SATA II speed due to the backplane's limitation.

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 →
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