CompTIA A+ Core 1 220-1201 220-1201 Questions 151–225 | Page 3/12

151

MCQeasy

A user reports that their computer's hard drive makes a clicking noise and the system occasionally freezes. Which action should you take first?

A.Run CHKDSK to repair file system errors.

B.Replace the hard drive immediately.

C.Back up the user's data as soon as possible.

D.Update the hard drive firmware.

AnswerC

The clicking sound emanating from a hard drive is a classic symptom of impending mechanical failure, often indicating issues with the read/write heads or spindle motor. In such critical situations, the absolute priority is to preserve any accessible data before the drive fails completely. Backing up the user's data as soon as possible ensures that valuable information is not lost when the drive inevitably stops functioning.

Why this answer

Clicking noises from a hard drive often indicate mechanical failure (head crash). Immediate backup of critical data is the priority before further troubleshooting or replacement.

Full explanation →

152

MCQmedium

A technician is troubleshooting a workstation that fails to boot. The motherboard has a POST code display showing '00'. The CPU fan spins, but there is no display output. Which component is most likely faulty?

A.The power supply unit

B.The RAM modules

C.The CPU

D.The graphics card

AnswerC

The '00' POST code is a strong indicator of a fundamental CPU initialization failure, particularly common with AMI BIOS systems. This code suggests that the central processing unit is either not properly seated in its socket, has bent pins, is physically damaged, or is fundamentally incompatible with the motherboard, preventing the system from even beginning the Power-On Self-Test (POST) sequence effectively. It signifies a failure at the very earliest stage of system startup, before other major components are tested.

Why this answer

A POST code of '00' on most motherboard diagnostic displays indicates the CPU has not completed its initialization — the system never reaches the point of handing off to BIOS. Combined with spinning fans (power present) but no display, the CPU is the most likely failed component. POST code 00 typically means the processor failed to initialize or is not being recognized.

Exam trap

The trap is assuming any no-display symptom points to the GPU or RAM — but a POST code of 00 specifically indicates the CPU never initialized, so candidates who skip reading the POST code pick the wrong component.

How to eliminate wrong answers

Option A is wrong because a faulty PSU would typically prevent the fans from spinning or cause intermittent shutdowns; here the fan spins, indicating power is being delivered. Option B is wrong because faulty RAM usually produces a specific beep code or a different POST code (often related to memory training), and the system would typically still attempt to initialize the CPU first. Option D is wrong because a failed graphics card would still allow the CPU to complete POST and would usually produce a display-related beep code or a different POST code, not a stall at 00.

Full explanation →

153

MCQhard

A technician is selecting a power supply for a workstation that will run 24/7 in a dusty environment. The PSU will be installed in a case with limited airflow. Which PSU feature is most important to prioritize for long-term reliability in this scenario?

A.A high total wattage rating to ensure headroom.

B.A modular cable design for easier cable management.

C.A fan with a fluid dynamic bearing and a dust filter.

D.An 80 Plus Bronze efficiency rating.

AnswerC

A fluid dynamic bearing (FDB) fan offers superior longevity and quieter operation compared to traditional sleeve or ball bearings, especially in environments prone to dust, as the fluid lubrication reduces friction and wear. Coupled with a dust filter, which actively prevents particulate matter from entering the power supply unit, this combination directly addresses the primary causes of PSU failure in challenging conditions: internal dust buildup, overheating, and premature fan degradation. This design significantly enhances the PSU's reliability and lifespan.

Why this answer

In a dusty, low-airflow environment, the PSU's cooling system is the critical failure point. A fluid dynamic bearing (FDB) fan produces less friction and heat than sleeve or ball bearings, extending lifespan, while a dust filter prevents particulate buildup on heatsinks and fan blades that would otherwise cause overheating and premature failure. Together, these features directly address the environmental stressors described, making C the most important reliability feature.

Exam trap

The trap here is conflating efficiency certification (80 Plus Bronze) or wattage headroom with long-term reliability, when the scenario's dusty, low-airflow conditions specifically demand cooling and contamination protection.

How to eliminate wrong answers

Option A is wrong because higher wattage headroom does not mitigate dust ingress or poor airflow; an oversized PSU still overheats if its cooling path is compromised. Option B is wrong because modular cabling improves aesthetics and airflow marginally but does nothing to protect the PSU internals from dust or bearing wear. Option D is wrong because 80 Plus Bronze certifies efficiency at specific load points, not durability; a Bronze-rated unit can still fail quickly in a dusty, hot environment if its fan and filtration are inadequate.

Full explanation →

154

MCQhard

A technician is troubleshooting a display that shows a single vertical line of dead pixels from top to bottom. The monitor is under warranty. Which of the following is the most appropriate resolution?

A.Use a pixel-fixing software to cycle colors rapidly

B.Gently massage the affected area with a soft cloth

C.Replace the monitor under warranty

D.Update the graphics card driver

AnswerC

A persistent vertical line of dead pixels is a definitive indicator of a manufacturing defect within the display panel itself, often pointing to a failure in a specific column driver circuit or a damaged ribbon cable connecting to the LCD matrix. Since this is a hardware failure inherent to the monitor's construction and not user-repairable, replacing the unit under warranty is the appropriate and most cost-effective solution. This ensures the user receives a fully functional display without incurring additional repair costs.

Why this answer

A vertical line of dead pixels indicates a defect in the LCD panel's column driver or bonding, which is a hardware failure. Unlike a few stuck pixels, this cannot be fixed by software or gentle pressure. The correct answer is to replace the monitor under warranty, as this is a manufacturing defect.

Full explanation →

155

MCQmedium

A technician is setting up internet for a remote cabin that is 5 miles from the nearest road. No wired infrastructure exists. Which connection type is most practical for reliable, moderate-speed internet?

A.DSL

B.Cable

C.Satellite

D.Fiber optic

AnswerC

Satellite internet is the most viable solution for remote locations because it does not depend on terrestrial cabling or cellular towers. It provides connectivity by communicating with geostationary or Low Earth Orbit (LEO) satellites via a dish antenna installed at the user's location, requiring only a clear line of sight to the sky. This independence from ground-based infrastructure makes it ideal for a cabin 5 miles from the road where traditional wired services are unavailable.

Why this answer

Satellite internet is the only viable option for a remote cabin 5 miles from the nearest road with no wired infrastructure. It uses a geostationary satellite to provide coverage anywhere with a clear line of sight to the sky, offering moderate speeds (typically 25–100 Mbps) without requiring terrestrial cabling. DSL, cable, and fiber all depend on physical infrastructure (copper phone lines, coaxial cable, or fiber optic cables) that cannot reach such a remote location.

Exam trap

A common misconception tested on the CompTIA A+ exam is that DSL or cable can be extended over long distances using repeaters or amplifiers, but in reality, both technologies have strict distance limits (DSL ~18,000 feet from the CO; cable ~100 miles with amplifiers) and require existing wired infrastructure that simply does not exist in a remote cabin 5 miles from the nearest road.

How to eliminate wrong answers

Option A is wrong because DSL requires a copper telephone line from a central office (CO) to the premises, and the cabin is 5 miles from the nearest road with no wired infrastructure, making DSL impossible. Option B is wrong because cable internet relies on coaxial cable from a cable headend, which also requires existing wired infrastructure that is absent in this scenario. Option D is wrong because fiber optic internet depends on fiber optic cables run directly to the premises, which is not available in a remote area without wired infrastructure.

Full explanation →

156

MCQeasy

A small business owner wants to set up a guest Wi-Fi network that is isolated from the main corporate network to prevent unauthorized access to sensitive data. The wireless router supports multiple SSIDs. Which configuration should be applied to achieve this isolation?

A.Assign the guest SSID to a different VLAN

B.Use a different SSID name for guests

C.Enable WPA2 encryption on the guest network

D.Disable DHCP on the guest SSID

AnswerA

This is the correct approach for network segmentation. A Virtual Local Area Network (VLAN) logically separates network traffic at Layer 2 (Data Link Layer) of the OSI model, even if devices are connected to the same physical switch or access point. By assigning the guest SSID to a distinct VLAN, guest devices receive IP addresses from a separate subnet and are prevented from directly communicating with devices on the corporate VLAN, thereby enhancing security and isolating resources. This ensures that guest users cannot access internal company servers or sensitive data.

Why this answer

Assigning the guest SSID to a different VLAN (Virtual Local Area Network) creates a logical separation between the guest traffic and the corporate network. VLANs operate at Layer 2, and by placing the guest SSID on a separate VLAN, the router can apply inter-VLAN ACLs or disable routing between VLANs entirely, ensuring that guest devices cannot access corporate resources. This is the standard method for network isolation in multi-SSID environments.

Exam trap

The trap here is that candidates confuse 'different SSID name' with actual network isolation, assuming a separate name alone creates a separate broadcast domain, when in fact VLAN assignment is required for Layer 2 separation.

How to eliminate wrong answers

Option B is wrong because simply using a different SSID name does not provide any network-level isolation; it only differentiates the network names, but traffic from both SSIDs could still share the same broadcast domain and subnet. Option C is wrong because enabling WPA2 encryption secures the wireless link against eavesdropping but does not prevent a connected guest device from accessing other devices on the same subnet or the corporate network. Option D is wrong because disabling DHCP on the guest SSID would prevent clients from obtaining an IP address, making the network unusable; it does not isolate traffic, and clients could still manually configure IPs and reach corporate resources if no VLAN separation exists.

Full explanation →

157

MCQeasy

A small office has an inkjet printer that is printing blank pages even though the ink cartridges are full and properly installed. What is the most likely cause of this problem?

A.The printer driver is corrupted

B.The printhead is clogged

C.The paper type setting is wrong

D.The USB cable is faulty

AnswerB

A clogged printhead is a common issue in inkjet printers where dried ink or debris obstructs the tiny nozzles responsible for ejecting ink onto the paper. When the nozzles are blocked, the printer attempts to print, but no ink can pass through, leading to a completely blank page being outputted, even if the ink cartridges are full. This specific symptom directly points to a physical obstruction in the ink delivery system.

Why this answer

A clogged printhead prevents ink from being ejected onto the paper even when cartridges are full and correctly installed, producing blank pages. Inkjet printheads have microscopic nozzles that dry out or clog with dried ink residue when the printer sits idle, blocking all ink flow. Running the built-in cleaning cycle or manually cleaning the printhead typically restores output.

Exam trap

The trap here is assuming that 'full cartridges' means the ink delivery path is functional — candidates overlook that a clogged printhead blocks ink flow regardless of cartridge level.

How to eliminate wrong answers

Option A is wrong because a corrupted driver typically causes garbled output, missing print jobs, or error messages — not consistently blank pages, since the printer would still receive and render data. Option C is wrong because an incorrect paper type setting affects ink absorption, drying, and print quality (smearing or fading), but does not stop ink from being deposited entirely. Option D is wrong because a faulty USB cable causes no communication at all — the job would fail to print or show offline status, not produce blank sheets.

Full explanation →

158

MCQeasy

A technician is installing a new network drop in a warehouse where there is high electromagnetic interference (EMI) from machinery. Which cable type should be used to minimize signal degradation?

A.Cat5e UTP

B.Cat6a STP

C.Coaxial cable

D.Plenum-rated cable

AnswerB

STP adds a foil or braided shield that drains induced EMI to ground, preventing machinery noise from corrupting the signal. Cat6a STP also sustains 10 Gbps over 100 metres, satisfying both the interference constraint and any bandwidth headroom the warehouse run needs.

Why this answer

Cat6a STP (Shielded Twisted Pair) is the correct choice because its individual pair shielding and overall braided shield provide robust protection against high electromagnetic interference (EMI) from warehouse machinery. The shielding effectively blocks external noise, preventing signal degradation and maintaining data integrity over longer distances, unlike unshielded cables.

Exam trap

CompTIA often tests the distinction between cable shielding (STP vs. UTP) and cable jacket rating (plenum vs. riser). The trap here is that candidates confuse plenum rating with EMI protection, assuming a fire-retardant jacket also blocks interference.

How to eliminate wrong answers

Option A (Cat5e UTP) is wrong because Unshielded Twisted Pair lacks any metallic shielding, making it highly susceptible to EMI from machinery, which can cause bit errors and retransmissions. Option C (Coaxial cable) is wrong because while coaxial cable has a single center conductor and shield, it is typically used for broadband or video signals, not for modern twisted-pair Ethernet drops, and its impedance (50 or 75 ohms) is mismatched for standard 100-ohm Ethernet, leading to signal reflection issues. Option D (Plenum-rated cable) is wrong because plenum rating refers only to fire safety and low smoke emission for installation in air-handling spaces, not to EMI protection; a plenum-rated cable can be UTP or STP, so it does not inherently minimize signal degradation from interference.

Full explanation →

159

MCQhard

A client wants to install a new power supply in a custom PC that uses a mini-ITX motherboard inside a compact case. The current PSU is a standard ATX unit, but the client wants to reduce clutter and improve airflow. Which form factor should you recommend?

A.ATX (standard)

B.SFX

C.TFX

D.EPS

AnswerB

SFX (Small Form Factor) power supplies are specifically engineered for compact builds, such as those utilizing mini-ITX motherboards. With typical dimensions around 125mm x 63.5mm x 100mm, SFX units are significantly smaller than ATX PSUs, allowing for proper fit and improved internal airflow in space-constrained cases. Despite their reduced size, modern SFX PSUs can deliver substantial wattage, making them ideal for high-performance mini-ITX gaming or workstation systems.

Why this answer

SFX (Small Form Factor) power supplies are designed for compact cases and mini-ITX builds, offering the same wattage range as ATX units in a smaller footprint that reduces clutter and improves airflow. This is the standard recommendation for space-constrained builds.

Exam trap

220-1201 often tests the confusion between PSU form factors and motherboard form factors — candidates may pick ATX because the motherboard is mini-ITX, but the PSU form factor is independent of the board size.

How to eliminate wrong answers

Option A is wrong because a standard ATX PSU is the current unit the client wants to replace — it is physically larger and contributes to the clutter and airflow problems in a compact case. Option C is wrong because TFX is a slim form factor used in low-profile OEM desktops, not the standard choice for mini-ITX custom builds, and its shape may not fit typical mini-ITX cases. Option D is wrong because EPS is a server/workstation power supply specification (often 8-pin CPU connectors), not a compact consumer form factor for mini-ITX cases.

Full explanation →

160

MCQeasy

A small office uses an inkjet printer that has not been used for two weeks. Now, the prints show missing colors and horizontal white lines. What should be done first to resolve this?

A.Replace the ink cartridges

B.Run the printhead cleaning cycle

C.Update the printer driver

D.Replace the printer

AnswerB

Running the printhead cleaning cycle is the correct first step because it is specifically designed to address clogged nozzles, a common problem for inkjet printers that have been idle. This maintenance function forces ink through the nozzles at high pressure or uses a physical wiper to clear dried ink and debris. Successfully clearing these blockages restores proper ink flow, resolving issues like missing colors or streaks in printouts.

Why this answer

Inkjet printers that sit idle often have dried ink in the printhead nozzles, causing missing colors or lines. Running the printer's built-in printhead cleaning cycle uses ink to flush the nozzles. If that fails, a manual cleaning or replacement may be needed.

Full explanation →

161

MCQhard

A company has a network with multiple VLANs. Users on VLAN 10 need to access a server on VLAN 20, but they cannot. The technician verifies that the switch ports are correctly assigned and the server is reachable from other VLANs. Which of the following is the MOST likely cause?

A.The router or Layer 3 switch is not configured to route between VLAN 10 and VLAN 20.

B.The default gateway on VLAN 10 is misconfigured.

C.The subnet mask on the server is incorrect.

D.The DNS server is not resolving the server's hostname for VLAN 10 clients.

AnswerA

Inter-VLAN routing must be explicitly configured on a router or Layer 3 switch. If routing between VLAN 10 and VLAN 20 is not enabled, traffic cannot pass between them. The fact that other VLANs can reach the server suggests that routing works for those VLANs but not for VLAN 10. This is the most likely cause.

Why this answer

Inter-VLAN routing requires explicit configuration on a Layer 3 device. If VLAN 10 cannot reach VLAN 20 while other VLANs can, the routing between those specific VLANs is likely missing or misconfigured. This is the most probable cause given the symptoms.

Other options would cause broader connectivity issues.

Exam trap

The trap here is assuming a DNS or server configuration issue when the problem is isolated to one VLAN's ability to reach another, which points to inter-VLAN routing or ACLs.

Full explanation →

162

MCQmedium

A user complains that their computer is running slowly, especially when opening multiple browser tabs. Task Manager shows the CPU is at 100% usage constantly, even when idle. Which of the following is the most likely cause?

A.Insufficient RAM

B.CPU thermal throttling

C.Background malware or a driver issue

D.Failing hard drive

AnswerC

Background malware often executes resource-intensive tasks such as cryptocurrency mining, data exfiltration, or denial-of-service attacks, which can consume nearly all available CPU cycles without user interaction. Similarly, a poorly written or corrupted device driver can enter an infinite loop or mismanage hardware interrupts, causing the kernel to constantly process erroneous requests. Both scenarios lead to persistent, unexplained 100% CPU utilization, making the system extremely slow and unresponsive.

Why this answer

Constant 100% CPU usage even at idle is a classic indicator of a background process consuming CPU — most commonly malware (cryptominers, botnet agents) or a misbehaving/faulty driver. Malware like cryptojackers is specifically designed to peg CPU continuously, and a corrupted or outdated driver can cause runaway kernel or DPC activity. This matches the symptom far better than the other options.

Exam trap

220-1201 often tests whether candidates jump to hardware causes (RAM, disk, thermals) for performance complaints — the trap is missing that sustained 100% CPU at idle points to software (malware/driver), not insufficient resources.

How to eliminate wrong answers

Option A is wrong because insufficient RAM causes high disk paging and sluggish multitasking, not sustained 100% CPU at idle — Task Manager would show high memory usage and disk activity instead. Option B is wrong because thermal throttling reduces CPU speed to cool the chip; it would show lower clock speeds and high temperatures, not 100% utilization at idle. Option D is wrong because a failing hard drive causes I/O errors, slow disk access, SMART warnings, and possibly boot failures — not constant CPU saturation.

Full explanation →

163

MCQmedium

A small office uses a network printer that supports both IPP and LPD printing. The printer is configured to use the default port for IPP. Which port must be open on the firewall for printing to work?

A.515

B.9100

C.631

D.80

AnswerC

IPP uses TCP port 631 by default, so the firewall must permit traffic on that port for the printer to accept jobs. LPD would instead require port 515, but the printer is configured for IPP, making 631 the required rule.

Why this answer

IPP (Internet Printing Protocol) uses TCP port 631 by default, as defined in RFC 2911. Since the printer is configured to use the default port for IPP, the firewall must allow inbound traffic on port 631 for printing to function.

Exam trap

A common trap in CompTIA A+ exams is confusing IPP (port 631) with LPD (port 515) or HTTP (port 80) since IPP is HTTP-based. Candidates may incorrectly choose port 515 assuming all network printing uses LPD, or port 80 thinking IPP uses standard HTTP.

How to eliminate wrong answers

Option A is wrong because port 515 is used by LPD (Line Printer Daemon), not IPP. Option B is wrong because port 9100 is used by raw printing (JetDirect/PJL), not IPP. Option D is wrong because port 80 is used by HTTP, not by IPP; while IPP is based on HTTP, it uses port 631 as its well-known port.

Full explanation →

164

MCQeasy

A user reports that their desktop computer cannot connect to the internet, but other devices on the same network work fine. You check the patch cable from the wall jack to the PC and find it is a Cat5e cable. The PC's network adapter shows a link light, but no activity. What should you do first?

A.Replace the Cat5e cable with a Cat6 cable.

B.Check the IP address configuration on the PC to see if it has a valid address.

C.Reboot the switch in the wiring closet.

D.Replace the network adapter in the PC.

AnswerB

The presence of a link light indicates that the physical layer (Layer 1) connection between the PC's network adapter and the network device (e.g., switch) is established. However, the absence of network activity or connectivity suggests a problem at higher layers, most commonly the network layer (Layer 3). An invalid or missing IP address, whether due to a DHCP server failure, incorrect static configuration, or a duplicate IP, would prevent the PC from communicating on the network despite having a physical link. This is a critical first step in logical troubleshooting.

Why this answer

The link light indicates Layer 1 (physical) connectivity is present, so the cable and switch port are likely functional. The lack of activity suggests the PC is not successfully communicating at Layer 3, often due to an incorrect or missing IP address. Checking the IP configuration (e.g., with `ipconfig` or `ifconfig`) is the logical first step to verify if the PC has a valid address from DHCP or is set to an APIPA range (169.254.x.x), which would prevent internet access.

Exam trap

The trap here is that candidates see a link light and assume the physical layer is fully functional, but they overlook that a link light only confirms Layer 1 connectivity, not Layer 3 addressing—the CompTIA A+ exam often tests this distinction to see if you know to verify IP configuration before replacing hardware.

How to eliminate wrong answers

Option A is wrong because replacing a Cat5e cable with Cat6 does not address a Layer 3 issue; Cat5e is fully capable of supporting typical internet speeds (up to 1 Gbps) and the link light confirms the cable is working. Option C is wrong because rebooting the switch is unnecessary when other devices on the same network work fine, indicating the switch and upstream connectivity are operational. Option D is wrong because the network adapter shows a link light, proving the adapter is physically functional; replacing it would be premature without first checking software/configuration issues.

Full explanation →

165

MCQmedium

A customer complains that their computer takes a long time to switch between open applications and frequently shows the 'low memory' warning. The system has 8 GB of DDR3 RAM. Task Manager shows that 7.5 GB is in use when only a few applications are open. What is the most likely cause?

A.The hard drive is failing and causing the system to use excessive virtual memory.

B.The system has a memory leak in one of the running applications.

C.The RAM modules are not installed in the correct slots for dual-channel mode.

D.The page file is set too small.

AnswerB

A memory leak occurs when an application fails to release memory that it no longer needs, leading to a gradual but continuous increase in its RAM consumption over time. This unreleased memory accumulates, eventually depleting the system's available physical RAM and forcing the operating system to rely heavily on the page file (virtual memory). This constant swapping results in severe performance degradation and 'low memory' warnings, even with few applications initially running, perfectly matching the described symptoms.

Why this answer

A memory leak in a running application is the most likely cause when Task Manager shows 7.5 GB of 8 GB RAM in use with only a few applications open. A memory leak occurs when an application allocates memory but fails to release it back to the OS, causing steadily increasing RAM consumption over time. The symptoms — slow application switching (due to paging) and 'low memory' warnings — are classic indicators of a leak consuming available physical RAM.

Exam trap

220-1201 often tests the distinction between RAM exhaustion caused by a leak versus hardware/configuration issues — candidates pick 'dual-channel slots' or 'page file too small' because those are familiar RAM-related fixes, but the symptom of 7.5 GB used with few apps points specifically to a software memory leak.

How to eliminate wrong answers

Option A is wrong because a failing hard drive would cause I/O errors, slow disk performance, and potentially SMART warnings — not excessive RAM usage; virtual memory usage would increase only as a symptom of RAM exhaustion, not as the root cause. Option C is wrong because incorrect dual-channel slot placement affects memory bandwidth and performance slightly, but does not cause 7.5 GB of RAM to be consumed by a few applications — the total capacity is still 8 GB regardless of channel configuration. Option D is wrong because a too-small page file would cause 'out of memory' errors or application crashes when RAM is exhausted, but it would not cause Task Manager to report 7.5 GB of physical RAM in use — the page file is disk-based, not physical RAM.

Full explanation →

166

MCQeasy

A small office has a single router with four LAN ports. The network uses the 192.168.1.0/24 subnet, and the router's LAN IP is 192.168.1.1. A technician needs to add a new printer that must have a static IP address outside the DHCP range (192.168.1.100-192.168.1.200) but still be reachable by all devices. Which IP address should the technician assign to the printer?

A.192.168.1.150

B.192.168.1.50

C.10.0.0.50

D.192.168.2.50

AnswerB

The address 192.168.1.50 is an ideal choice for a static IP assignment as it resides within the same 192.168.1.0/24 subnet as the existing network. Crucially, it falls outside the common DHCP range (100-200), ensuring it will not be dynamically assigned to another device by the router. This prevents potential IP address conflicts, guaranteeing reliable and consistent network access for the statically configured device.

Why this answer

(192.168.1.50) is correct because it falls within the 192.168.1.0/24 subnet, is outside the DHCP range of 192.168.1.100–200, and is on the same broadcast domain as all devices, ensuring reachability without an IP conflict.

Exam trap

A common mistake is to think any IP in the same subnet works, ignoring the DHCP exclusion range, leading candidates to pick an address like 192.168.1.150 that is inside the pool.

How to eliminate wrong answers

Option A is wrong because 192.168.1.150 lies inside the DHCP range (100–200), risking a future IP conflict if the DHCP server assigns that address to another device. Option C is wrong because 10.0.0.50 is on a different subnet (10.0.0.0/24) and would require routing or a gateway change to be reachable from 192.168.1.x devices. Option D is wrong because 192.168.2.50 is on a different subnet (192.168.2.0/24) and is not directly reachable without a router interface configured on that subnet.

Full explanation →

167

MCQmedium

A customer is moving into a new apartment building that has a fiber optic terminal in the basement. They want the fastest possible internet. What equipment will the technician need to install inside the apartment to complete the connection?

A.A cable modem

B.A DSL modem

C.An Optical Network Terminal (ONT)

D.A satellite modem

AnswerC

An Optical Network Terminal (ONT) is the correct device for fiber optic internet service, as it serves as the demarcation point for the fiber connection within the customer's premises. The ONT converts the incoming optical signals, transmitted via fiber optic cable, into electrical signals, typically Ethernet, that can be utilized by standard networking equipment like a Wi-Fi router. This conversion is essential for connecting the fiber network to the customer's local area network.

Why this answer

Fiber optic internet requires an Optical Network Terminal (ONT) to convert the optical signal from the fiber line into electrical signals that standard Ethernet equipment can use. The ONT is typically installed inside the customer's premises and connects to the fiber terminal in the basement via a fiber patch cable, providing the fastest possible internet speeds.

Exam trap

The trap here is that candidates may confuse the ONT with a cable modem or DSL modem because all three are 'modems' that connect to a service provider, but only the ONT is specific to fiber optic technology.

How to eliminate wrong answers

Option A is wrong because a cable modem is used for coaxial cable-based internet (e.g., DOCSIS), not for fiber optic connections. Option B is wrong because a DSL modem is designed for telephone line-based DSL (e.g., ADSL, VDSL), which cannot handle fiber optic signals. Option D is wrong because a satellite modem is used for satellite internet, which involves radio frequency signals to and from a satellite, not fiber optic cabling.

Full explanation →

168

MCQhard

A company is migrating its on-premises database to a cloud PaaS solution. The database currently contains sensitive customer information. Which of the following is the most important security consideration for the migration?

A.Ensuring the PaaS provider has physical security at their data center

B.Configuring encryption for data at rest and in transit

C.Setting up a VPN between the on-premises network and the cloud

D.Verifying that the provider uses a specific hypervisor

AnswerB

Configuring encryption for data at rest ensures that if the cloud storage is ever compromised, the stored database contents remain unreadable without the proper decryption keys. Simultaneously, encrypting data in transit protects the information as it moves across networks during the migration process, preventing unauthorized access or interception. This dual-layer encryption is the most effective method for safeguarding sensitive data throughout its lifecycle in a cloud environment.

Why this answer

Configuring encryption for data at rest and in transit is the most important security consideration because the database contains sensitive customer information, and encryption protects confidentiality both while stored in the PaaS provider's storage and while moving over the network during migration. It directly addresses the risk of data exposure at the two points where the data is most vulnerable.

Exam trap

220-1201 often tests the shared responsibility model by presenting provider-side controls (physical security, hypervisor) as distractors, so candidates pick a control the customer does not own instead of the customer-owned encryption responsibility.

How to eliminate wrong answers

Option A is wrong because physical security at the provider's data center is the provider's responsibility under the shared responsibility model and is not something the migrating company configures — it is a baseline assumption, not the most important migration-specific consideration. Option C is wrong because a VPN secures the migration path but does not protect data at rest in the PaaS database, leaving stored sensitive data unprotected. Option D is wrong because the hypervisor choice is an implementation detail of the provider's infrastructure and has no direct bearing on protecting the customer's sensitive data.

Full explanation →

169

MCQhard

A user reports that their tablet's screen is completely black but the device vibrates when powered on. You have already tried a forced restart and checked for physical damage. What is the most likely hardware cause?

A.The battery is completely drained.

B.The LCD panel or display ribbon cable is faulty.

C.The digitizer is cracked.

D.The OS is corrupted.

AnswerB

When a tablet vibrates upon power-on but displays a completely black screen, it strongly suggests that the device's internal components, such as the motherboard and CPU, are functioning correctly and initiating the boot sequence. However, the absence of any visual output points directly to a failure within the display subsystem itself. This could be due to a damaged LCD panel, which is responsible for generating the image, or a disconnected/faulty display ribbon cable that transmits video signals from the mainboard to the screen.

Why this answer

The device vibrating on power-on indicates the system board, processor, and power management are functioning, but the display subsystem is not. Since a forced restart and physical damage inspection have been ruled out, the most likely hardware cause is a faulty LCD panel or a damaged display ribbon cable connecting the mainboard to the screen. This explains why the device is operational (vibration) yet the screen remains black.

Exam trap

CompTIA A+ often tests the distinction between the digitizer (touch input) and the LCD panel (display output); the trap here is that candidates confuse a cracked digitizer with a black screen, but a cracked digitizer does not prevent the LCD from showing an image.

How to eliminate wrong answers

Option A is wrong because a completely drained battery would not allow the device to vibrate on power-on; the vibration motor requires sufficient battery charge to activate. Option C is wrong because a cracked digitizer (touch layer) would typically cause touch input issues or visible cracks, not a completely black screen; the LCD panel behind it would still display an image. Option D is wrong because a corrupted OS would usually show a boot loop, logo stuck, or error messages on the screen, not a completely black screen with a successful vibration indicating the OS has loaded.

Full explanation →

170

MCQhard

A user reports that their USB 3.0 external SSD is only achieving USB 2.0 speeds when connected to a front panel port. The technician checks the motherboard and finds the front panel header is connected to a USB 3.0 header. Which of the following is the most likely cause of the slow speed?

A.The SSD is formatted with FAT32

B.The front panel USB cable is damaged or not fully seated

C.The motherboard BIOS needs updating

D.The SSD is connected via a USB 2.0 hub

AnswerB

A damaged or improperly seated front panel USB cable is a very common cause for a USB 3.0 device to operate at slower USB 2.0 speeds. USB 3.0 SuperSpeed requires additional, high-speed differential data pairs that are highly sensitive to signal integrity. If these delicate lines are compromised by physical damage or a loose connection, the host and device will negotiate down to the more robust, slower USB 2.0 protocol to maintain a stable, albeit reduced, connection.

Why this answer

A USB 3.0 front panel header on the motherboard must connect to the front panel ports via an internal cable. If that cable is damaged or not fully seated, the ports may fall back to USB 2.0 signaling or fail to negotiate USB 3.0 speeds. Since the motherboard header is confirmed as USB 3.0, the most likely cause is a physical connection issue in the front panel cable path.

Exam trap

The trap here is that candidates may blame software or formatting when the symptom is a single port running at USB 2.0 speeds despite a USB 3.0 header, pointing to a physical cabling issue.

How to eliminate wrong answers

Option A is wrong because FAT32 formatting affects file size limits and compatibility, not USB link speed. Option C is wrong because a BIOS update is unlikely to fix a single port's speed when the header is already USB 3.0 and other ports work. Option D is wrong because the scenario states the SSD is connected directly to a front panel port, not through a USB 2.0 hub.

Full explanation →

171

MCQmedium

A user connects a 4K monitor to their laptop using a USB-C port. The monitor is detected, but the resolution is stuck at 1920x1080. The laptop supports 4K output via USB-C. What is the most likely reason?

A.The monitor's HDMI port is defective

B.The USB-C cable does not support DisplayPort Alt Mode

C.The laptop's graphics driver is outdated

D.The monitor's refresh rate is set too high

AnswerB

USB-C is a versatile connector, but not all USB-C cables are created equal or support all its optional modes. DisplayPort Alternate Mode (Alt Mode) is a critical feature that allows a USB-C port to transmit DisplayPort video signals, which are essential for high-resolution output like 4K. Without a cable specifically designed and wired to support DisplayPort Alt Mode, the necessary high bandwidth for 4K video cannot be transmitted, forcing the display to operate at a lower, more basic resolution that requires less data throughput.

Why this answer

The most likely reason is that the USB-C cable does not support DisplayPort Alt Mode. For a USB-C port to output a 4K video signal, the cable must be capable of carrying DisplayPort signals alongside USB data. If the cable is a standard USB 2.0 or 3.x cable without Alt Mode support, the system will fall back to a lower resolution like 1920×1080, even if the laptop and monitor both support 4K.

Exam trap

CompTIA often tests the misconception that any USB-C cable can carry video, when in fact only cables explicitly supporting DisplayPort Alt Mode (or Thunderbolt 3/4) can deliver high-resolution video signals.

How to eliminate wrong answers

Option A is wrong because a defective HDMI port on the monitor would typically cause no display or intermittent signal, not a specific resolution cap at 1920×1080. Option C is wrong because an outdated graphics driver could cause resolution issues, but the laptop already supports 4K output via USB-C, and the monitor is detected, making a driver problem less likely than a cable limitation. Option D is wrong because setting the monitor's refresh rate too high would usually result in a blank screen or an 'out of range' error, not a forced lower resolution.

Full explanation →

172

MCQmedium

A user reports that their laptop's external monitor connected via USB-C to HDMI adapter flickers intermittently. The adapter works fine with other devices. What is the most likely cause?

A.The HDMI cable is defective.

B.The USB-C port on the laptop has a loose connection.

C.The monitor's refresh rate is set too high for the adapter.

D.The laptop's graphics driver is outdated.

AnswerB

A loose connection within the laptop's USB-C port can intermittently disrupt the high-speed data lanes responsible for transmitting video signals. This physical instability causes the display signal to drop or become corrupted momentarily, leading to the observed flickering or temporary loss of the external monitor's image. Such intermittent behavior is a classic symptom of a compromised physical connection.

Why this answer

The adapter works fine with other devices, which isolates the problem to the laptop's USB-C port. A loose connection in the port can cause intermittent signal loss, leading to flickering. This is a common hardware issue with USB-C ports that support DisplayPort Alt Mode for video output.

Exam trap

The CompTIA A+ exam often tests the distinction between hardware and software issues by presenting a symptom that seems like a driver or cable problem, but the key clue is that the adapter works elsewhere, pointing to a port-level hardware fault.

How to eliminate wrong answers

Option A is wrong because the HDMI cable is not defective; the adapter works fine with other devices, so the cable is not the issue. Option C is wrong because if the monitor's refresh rate were too high for the adapter, the flickering would be persistent or the display would not work at all, not intermittent. Option D is wrong because an outdated graphics driver would typically cause consistent display issues or no output, not intermittent flickering that is isolated to a specific port.

Full explanation →

173

MCQmedium

A technician is building a high-performance workstation for video editing. The user needs fast read/write speeds for large 4K video files and wants the OS and applications on the same drive. The motherboard has one M.2 slot (PCIe 4.0 x4) and four SATA III ports. Which storage configuration should the technician recommend?

A.Install one SATA III SSD for the OS and one SATA III HDD for video files.

B.Install one M.2 NVMe PCIe 4.0 SSD for both OS and video files.

C.Install two SATA III SSDs in a RAID 0 array for the OS and video files.

D.Install one M.2 SATA SSD for the OS and one SATA III HDD for video files.

AnswerB

A single high-capacity M.2 NVMe PCIe 4.0 SSD provides extremely fast read/write speeds (over 5,000 MB/s), ideal for 4K video editing. It uses the available M.2 slot and meets the user's need for fast performance.

Why this answer

An M.2 NVMe PCIe 4.0 SSD delivers sequential read/write speeds of roughly 5,000–7,000 MB/s, far exceeding SATA III's ~550 MB/s ceiling, and the single M.2 slot supports it. Using one NVMe drive for both OS and 4K video files satisfies the requirement for fast read/write on large files while keeping the OS and applications on the same high-speed drive. This is the optimal configuration given the motherboard's single M.2 PCIe 4.0 x4 slot.

Exam trap

220-1201 often tests the confusion between M.2 form factor and NVMe protocol — candidates assume any M.2 drive is fast, but M.2 SATA drives are limited to ~550 MB/s and do not use PCIe lanes.

How to eliminate wrong answers

Option A is wrong because SATA III SSDs and HDDs are limited to ~550 MB/s and ~150 MB/s respectively, which is far too slow for large 4K video editing workloads. Option C is wrong because two SATA III SSDs in RAID 0 still cap at SATA III bandwidth per drive and RAID 0 offers no redundancy — while faster than a single SATA SSD, it is still far slower than NVMe PCIe 4.0 and wastes two SATA ports. Option D is wrong because an M.2 SATA SSD uses the SATA protocol (~550 MB/s) and does not leverage the PCIe 4.0 x4 lanes, so it underutilizes the slot and is too slow for 4K video files.

Full explanation →

174

MCQhard

A user reports that their laptop's Bluetooth mouse stops working after the laptop wakes from sleep. The mouse works fine after a reboot. The technician suspects a driver issue. Which of the following steps should the technician take to resolve this without disrupting other Bluetooth devices?

A.Uninstall the mouse driver and reboot.

B.Disable and re-enable the Bluetooth adapter in Device Manager.

C.Change the mouse's Bluetooth pairing to a different channel.

D.Update the laptop's BIOS to the latest version.

AnswerB

Disabling and re-enabling the Bluetooth adapter in Device Manager performs a soft reset of the Bluetooth radio and its associated software stack. This action effectively power cycles the module and reinitializes its services, clearing any transient errors, hung states, or minor software glitches that might prevent proper communication, especially after the laptop wakes from sleep. It's a non-destructive and highly effective first troubleshooting step that often resolves connectivity issues without affecting other paired devices.

Why this answer

Disabling and re-enabling the Bluetooth adapter in Device Manager resets the Bluetooth stack without a full reboot, often restoring functionality after sleep. This tests advanced troubleshooting of Bluetooth power management issues.

Full explanation →

175

MCQeasy

A user complains that their laptop's Wi-Fi connection is extremely slow and keeps dropping, but other devices on the same network work fine. The laptop is an older model running Windows 10. Which of the following should the technician try first?

A.Replace the laptop's Wi-Fi card

B.Update the Wi-Fi driver

C.Disable the firewall

D.Reset the router

AnswerB

Updating the Wi-Fi driver is a highly effective and often primary troubleshooting step for resolving various wireless connectivity issues, including slow speeds, intermittent disconnections, or complete inability to connect. Driver updates frequently include critical bug fixes, performance enhancements, and improved compatibility with operating system updates or new network standards. This ensures the Wi-Fi adapter communicates optimally with the operating system and the wireless network.

Why this answer

The first step in troubleshooting a slow Wi-Fi connection on an older laptop running Windows 10 is to update the Wi-Fi driver. Driver issues are a common cause of performance and connectivity problems, and updating is non-invasive and quick. Other devices work fine, so the router and network are likely not the issue.

Exam trap

220-1201 often tests the troubleshooting order, where candidates might jump to hardware replacement or router reset instead of starting with the least invasive software fix like driver updates.

How to eliminate wrong answers

Option A is wrong because replacing the Wi-Fi card is a hardware step that should be considered only after software/driver troubleshooting fails. Option C is wrong because disabling the firewall is a security risk and unlikely to resolve slow Wi-Fi; firewall issues typically block traffic, not slow it. Option D is wrong because resetting the router would affect all devices, and other devices are working fine, so the router is not the problem.

Full explanation →

176

MCQmedium

A small business owner wants to use a smartphone as a point-of-sale (POS) terminal for credit card payments. They ask which accessory is essential for this setup. What should you recommend?

A.A portable Bluetooth speaker for transaction alerts.

B.A rugged case to protect the phone from drops.

C.A magnetic stripe reader that plugs into the headphone jack.

D.A high-capacity power bank for extended use.

AnswerC

A magnetic stripe reader that plugs into the headphone jack is a crucial peripheral for enabling a smartphone to function as a mobile Point of Sale (mPOS) system. This device allows the smartphone to read payment card data from traditional magnetic stripe cards, converting the analog audio signal from the reader into digital data for transaction processing. It directly facilitates the primary function of accepting card payments.

Why this answer

A magnetic stripe reader that plugs into the headphone jack is the essential accessory for using a smartphone as a POS terminal for credit card payments. This reader captures the magnetic stripe data from the card and transmits it to the smartphone via the analog audio interface, enabling the payment processing app to read the card information. Without this reader, the smartphone cannot physically read the magnetic stripe, which is the most common method for swiping credit cards at a POS.

Exam trap

The 220-1201 exam often tests the distinction between essential accessories for specific functions versus general-purpose accessories; the trap here is that candidates may choose a power bank or rugged case as 'essential' for business use, but the question specifically asks for the accessory required to enable credit card payments, which is the magnetic stripe reader.

How to eliminate wrong answers

Option A is wrong because a portable Bluetooth speaker is not required for POS functionality; transaction alerts can be handled by the smartphone's built-in speaker or vibration, and the speaker does not enable card reading. Option B is wrong because a rugged case protects the phone from physical damage but does not provide any capability to read credit card data, making it non-essential for POS operation. Option D is wrong because a high-capacity power bank extends battery life but is not essential for the core function of processing credit card payments; the POS can operate with the phone's existing battery for typical usage.

Full explanation →

177

MCQeasy

After installing a second hard drive in a desktop PC, the system boots but the new drive does not appear in File Explorer. The drive is listed in Disk Management as 'Unknown' and 'Not Initialized'. What should the technician do first?

A.Replace the SATA cable.

B.Format the drive immediately.

C.Initialize the disk in Disk Management.

D.Update the motherboard chipset drivers.

AnswerC

Initializing the disk in Disk Management is the correct first step for a newly installed hard drive. This essential process writes a partition table, either Master Boot Record (MBR) or GUID Partition Table (GPT), to the disk. This partition table makes the drive logically recognizable to the operating system, allowing it to be subsequently partitioned into one or more volumes and then formatted with a file system for data storage.

Why this answer

A disk showing as 'Unknown' and 'Not Initialized' in Disk Management means the drive has no partition table (neither MBR nor GPT). The first step is to initialize the disk, which writes the partition table and allows the drive to be partitioned and formatted. Only after initialization can the drive be formatted and assigned a drive letter.

Exam trap

220-1201 often tests the order of operations — candidates jump to formatting because that's the familiar step, but initialization must precede partitioning and formatting for a brand-new disk.

How to eliminate wrong answers

Option A is wrong because if the drive appears in Disk Management, the SATA connection is working — a cable issue would cause the drive to not appear at all. Option B is wrong because you cannot format a disk that has not been initialized; formatting requires a valid partition, which requires a partition table first. Option D is wrong because chipset drivers affect device recognition at the OS level, but the drive is already recognized by Disk Management, so drivers are not the issue.

Full explanation →

178

MCQeasy

A user complains that their PC is running slowly and the fan is constantly running at high speed. Task Manager shows the CPU is consistently at 100% usage even when idle. Which of the following is the most likely cause?

A.The CPU is overheating due to dried thermal paste

B.A background process is consuming CPU cycles, such as a mining script or system update

C.The power supply is failing and cannot provide enough power

D.The CPU has been overclocked beyond its limits

AnswerB

A background process consuming CPU cycles is a direct and common cause for a PC running slowly with high CPU usage. Malicious software, such as a cryptomining script, or a legitimate but stuck or resource-intensive system update, can monopolize the CPU. This constant demand for processing power leaves insufficient resources for other applications, leading to overall system unresponsiveness, high temperatures, and continuous fan operation.

Why this answer

High CPU usage at idle is often due to background processes, such as malware or a runaway application. The constant high fan speed indicates the CPU is generating excess heat from this activity.

Full explanation →

179

MCQmedium

A user reports that their PC randomly restarts during boot-up, sometimes before the Windows logo appears. They have already tried reseating the RAM. Which component should be tested next?

A.Replace the motherboard

B.Test the power supply unit

C.Reinstall the operating system

D.Check for BIOS updates

AnswerB

A failing power supply unit (PSU) is a very common cause of random system restarts, particularly during the boot process when components draw significant power. If the PSU cannot deliver stable and consistent voltage to the motherboard, CPU, RAM, and other peripherals, these components may momentarily lose power or receive incorrect voltage, triggering an immediate system shutdown or reboot to prevent damage. Testing the PSU with a dedicated power supply tester or by temporarily swapping it with a known-good unit is a critical initial diagnostic step.

Why this answer

Random restarts during boot, especially before the Windows logo appears, strongly suggest a power delivery problem. The power supply unit (PSU) is the next logical component to test because insufficient or unstable voltage under load causes spontaneous shutdowns and reboots that occur before the OS even loads.

Exam trap

220-1201 often tests the tendency to jump to complex fixes (motherboard, OS reinstall) when the symptom — pre-boot random restarts — points to the simplest power-related cause.

How to eliminate wrong answers

Option A is wrong because replacing the motherboard is a drastic step that should come after simpler components like the PSU are ruled out. Option C is wrong because reinstalling the OS cannot fix a hardware-level reboot that happens before Windows loads. Option D is wrong because BIOS updates address firmware bugs and compatibility, not the power instability that causes pre-boot restarts.

Full explanation →

180

MCQmedium

A user wants to use their smartphone to make contactless payments at retail stores. The phone supports NFC. Which of the following must be configured on the phone to enable this functionality?

A.Install a QR code scanner app.

B.A mobile payment service with a linked credit card.

C.Bluetooth pairing with the payment terminal.

D.Enable USB OTG on the phone.

AnswerB

To make contactless payments, the user must set up a mobile payment service such as Google Wallet or Apple Pay and link a credit or debit card. The service stores a tokenized version of the card and uses NFC to transmit payment data securely. Without a configured payment service, the phone cannot act as a payment method even if NFC is enabled.

Why this answer

NFC contactless payments require a mobile payment service, such as Google Wallet or Apple Pay, with a linked payment card. The service handles tokenization and communicates with the terminal via NFC. Bluetooth pairing, USB OTG, or QR scanner apps are not involved in this process.

Thus, configuring a payment service is the essential step.

Exam trap

The trap here is assuming that enabling NFC alone is sufficient, but a payment service with a linked card must also be configured.

Full explanation →

181

MCQmedium

A technician is tasked with selecting a CPU for a small form factor (SFF) office PC that must run quietly and efficiently. Which CPU characteristic is most important for this build?

A.Highest possible clock speed

B.Integrated GPU

C.Low thermal design power (TDP)

D.Support for overclocking

AnswerC

Selecting a CPU with a low Thermal Design Power (TDP) is paramount for a quiet small form factor (SFF) build because it directly correlates with reduced heat generation. Less heat means the CPU requires less aggressive cooling, enabling the use of smaller, quieter heatsinks, passive cooling solutions, or low-speed, low-noise fans. This approach is fundamental to achieving minimal acoustic output while ensuring stable and reliable operation within a confined space.

Why this answer

In a small form factor (SFF) office PC, limited space restricts cooling capacity, so a CPU with a low thermal design power (TDP) is crucial. Low TDP means the processor generates less heat, allowing for quieter operation with smaller fans or passive cooling, and it also improves energy efficiency. While other factors like integrated GPU or clock speed matter, they don't directly address the primary constraints of quietness and efficiency in an SFF build.

Exam trap

The trap here is that candidates might focus on performance metrics like clock speed or overclocking, assuming they equate to better office performance, but the question emphasizes quietness and efficiency in a small form factor, making low TDP the key.

How to eliminate wrong answers

Option A is wrong because the highest possible clock speed often increases power consumption and heat output, which contradicts the goals of quiet and efficient operation in an SFF PC. Option B is wrong because while an integrated GPU can be beneficial for office tasks, it is not the most critical characteristic for quiet and efficient operation; many CPUs include integrated graphics without addressing thermal or power concerns. Option D is wrong because support for overclocking typically leads to higher power draw and heat generation, which is undesirable in a small form factor where cooling is limited and quietness is prioritized.

Full explanation →

182

MCQhard

A company deploys several tablets for field technicians that need to connect to a private LTE network via a SIM card. One tablet connects to the network but has very slow data speeds. Other tablets in the same area work fine. What is the most likely cause?

A.The tablet's Wi-Fi is interfering with the LTE signal.

B.The tablet's SIM card is not fully inserted.

C.The tablet is using the wrong APN configuration.

D.The tablet's battery saver mode is enabled.

AnswerC

The Access Point Name (APN) defines the network path for all cellular data connections, specifying the gateway, security protocols, and other settings the device uses to connect to the internet or a private network. An incorrect APN configuration might still allow a connection, but it could route data through an unoptimized or restricted gateway, apply incorrect Quality of Service (QoS) settings, or even connect to a different network segment with limited bandwidth. This often results in consistently slow data speeds, high latency, or inability to access specific resources, rather than a complete loss of service.

Why this answer

The most likely cause is an incorrect APN configuration. The APN (Access Point Name) defines the gateway between the LTE network and the internet, including required authentication and IP settings. If the APN is wrong, the tablet may still attach to the LTE network but will experience severely degraded data throughput because the packet data protocol (PDP) context cannot establish a proper data session.

Exam trap

The 220-1201 exam often tests the misconception that a SIM card insertion issue or battery saver mode can cause slow data speeds, but the key differentiator is that the tablet is connected to the network—pointing to a configuration error like the APN rather than a hardware or power-saving issue.

How to eliminate wrong answers

Option A is wrong because Wi-Fi and LTE operate on different frequency bands (2.4/5 GHz vs. 700 MHz–2.6 GHz typically) and use separate radios; Wi-Fi interference does not degrade LTE data speeds. Option B is wrong because a SIM card that is not fully inserted would cause the tablet to fail to register on the network entirely, not just slow data speeds. Option D is wrong because battery saver mode primarily reduces background activity and screen brightness, but it does not throttle LTE data throughput or alter network configuration.

Full explanation →

183

MCQmedium

A user reports that their iPad's Safari browser crashes immediately upon opening, but other apps work fine. They have already restarted the device. What should the technician do next?

A.Perform a factory reset on the iPad.

B.Update iOS to the latest version.

C.Clear Safari's history and website data in Settings.

D.Disable all Safari extensions.

AnswerC

Clearing Safari's history and website data in Settings is a highly effective and standard troubleshooting step for browser instability. This action removes potentially corrupted cached files, cookies, and browsing history that can interfere with Safari's normal operation and lead to crashes, allowing the browser to rebuild these data stores cleanly without affecting other applications or system settings.

Why this answer

Clearing Safari's history and website data removes corrupted cached files, cookies, or local storage data that can cause the browser to crash on launch. Since other apps work fine, the issue is isolated to Safari's stored data, not the entire system. This is the recommended first troubleshooting step for a single-app crash after a restart.

Exam trap

The 220-1201 exam often tests the principle of least invasive troubleshooting first, so the trap here is that candidates may jump to a factory reset (Option A) or an iOS update (Option B) instead of trying the simple, app-specific data clear that resolves the most common cause of a single-app crash.

How to eliminate wrong answers

Option A is wrong because performing a factory reset is a drastic, irreversible step that should only be attempted after all other software troubleshooting fails, and it would erase all user data unnecessarily for an app-specific issue. Option B is wrong because updating iOS is a broader system-level fix that addresses general bugs, but the problem is isolated to Safari's cached data; an update may not resolve corruption in existing website data and is not the next logical step after a restart. Option D is wrong because disabling all Safari extensions is a more targeted step that could help if an extension is causing the crash, but clearing history and website data is a simpler, less invasive first step that addresses the most common cause of browser crashes—corrupted cache or cookies.

Full explanation →

184

MCQmedium

A customer complains that their computer takes a very long time to boot and sometimes shows a 'CMOS Checksum Error' before starting. What is the most likely hardware issue?

A.The hard drive is failing

B.The RAM module is faulty

C.The CMOS battery is depleted

D.The UEFI firmware is corrupted

AnswerC

The CMOS battery (often a CR2032 coin cell) provides continuous power to the Complementary Metal-Oxide-Semiconductor (CMOS) memory chip, which stores critical system configuration settings like date, time, boot order, and hardware parameters. When this battery is depleted, the CMOS memory loses power, causing these settings to revert to default or become corrupted. This frequently results in a "CMOS checksum error" message during boot, as the system detects an inconsistency in its stored configuration.

Why this answer

The CMOS battery (a CR2032 coin cell on the motherboard) powers the RTC and the CMOS SRAM that stores BIOS/UEFI settings, including system time and hardware configuration. When it depletes, settings are lost on power-off, producing the 'CMOS Checksum Error' at POST and forcing the system to re-detect hardware and prompt for setup, which dramatically lengthens boot time. Replacing the battery and reconfiguring BIOS resolves both symptoms.

Exam trap

220-1201 often tests the misconception that a CMOS checksum error indicates firmware corruption or disk failure, when the overwhelmingly common cause is simply a depleted CMOS battery.

How to eliminate wrong answers

Option A is wrong because a failing hard drive causes read errors, SMART warnings, or boot failures — not a CMOS checksum error, which is generated by firmware before the OS or drive is even accessed. Option B is wrong because faulty RAM produces POST beep codes, memory test failures, or random crashes/BSODs, not loss of BIOS settings. Option D is wrong because corrupted UEFI firmware typically causes no POST, recovery-mode prompts, or a bricked board — it wouldn't intermittently lose settings and still boot slowly; a depleted battery is the far more common and reversible cause.

Full explanation →

185

MCQmedium

A technician is troubleshooting a VoIP phone that cannot register with the SIP server. The phone has a valid IP address and can ping the server. Which port should be verified as open for SIP traffic?

A.Port 80

B.Port 443

C.Port 5060

D.Port 1720

AnswerC

SIP signalling uses TCP or UDP port 5060 for registration and call setup, so that port must be permitted between the phone and the SIP server. Ping success only proves ICMP works, not that SIP signalling is reachable.

Why this answer

SIP (Session Initiation Protocol) uses UDP or TCP port 5060 by default for signaling between endpoints and the SIP server. Since the phone has a valid IP and can ping the server, the issue is likely a firewall blocking port 5060, preventing registration.

Exam trap

CompTIA often tests the distinction between SIP (port 5060) and other common protocols like HTTP (80), HTTPS (443), or H.323 (1720), expecting candidates to confuse VoIP signaling ports with web or video conferencing ports.

How to eliminate wrong answers

Option A is wrong because port 80 is used for HTTP web traffic, not SIP signaling. Option B is wrong because port 443 is used for HTTPS, which is not the default port for SIP registration. Option D is wrong because port 1720 is used for H.323 video conferencing, not SIP.

Full explanation →

186

MCQmedium

After replacing a motherboard, a technician finds that the PC will not power on at all. The power supply fan does not spin, and no LEDs light up. The PSU was working before the replacement. What is the most likely cause?

A.The power supply is dead

B.The CPU is not compatible with the new motherboard

C.The front panel power switch header is not connected correctly

D.The RAM is not seated properly

AnswerC

The front panel power switch header connects the physical power button on the computer case to the motherboard. When the power button is pressed, it momentarily completes a circuit on specific pins of this header, signaling the motherboard to initiate the power-on sequence for the power supply unit (PSU). If these small, often unlabeled, pins are incorrectly connected or not connected at all after a motherboard replacement, the electrical signal from the power button will not reach the motherboard, resulting in the system appearing completely dead with no fans or lights.

Why this answer

If the PSU fan does not spin and no LEDs illuminate, the system is not receiving the power-on signal, which is typically delivered by the front panel power switch header. After a motherboard replacement, it is very common to misconnect or omit the front panel header, so the PSU never gets the PS_ON# signal and remains off. The PSU itself was working before the swap, making the header the most likely culprit.

Exam trap

220-1201 often tests the assumption that a dead PSU is the cause of a no-power symptom, when a misconnected front panel power switch header is the more likely culprit after a motherboard replacement.

How to eliminate wrong answers

Option A is wrong because the PSU was working before the motherboard replacement, so a sudden failure is less likely than a connection issue introduced during the swap. Option B is wrong because CPU incompatibility would typically still allow fans and LEDs to power on (or produce a POST error), not a completely dead system. Option D is wrong because improperly seated RAM usually causes POST beeps or no display but still allows the PSU fan and LEDs to operate.

Full explanation →

187

MCQeasy

A customer reports that their wireless printer stops responding when the microwave is in use. The printer is connected via Wi-Fi to a dual-band router. Which troubleshooting step should the technician take first to resolve this issue?

A.Replace the printer with a wired model

B.Change the router’s 2.4 GHz channel

C.Connect the printer to the 5 GHz network

D.Update the printer firmware

AnswerC

Connecting the printer to the 5 GHz network is the most effective solution because the 5 GHz Wi-Fi band operates on a completely different frequency spectrum than microwave ovens. Microwave ovens emit electromagnetic radiation at approximately 2.45 GHz, directly interfering with the 2.4 GHz Wi-Fi band. Since the 5 GHz band utilizes frequencies ranging from 5.150 to 5.825 GHz, it is entirely unaffected by the emissions from a microwave oven, ensuring a stable and uninterrupted connection for the printer.

Why this answer

The microwave oven operates in the 2.4 GHz ISM band, generating broadband interference that disrupts Wi-Fi communication on that frequency. Connecting the printer to the 5 GHz network avoids this interference entirely because the 5 GHz band is not affected by microwave emissions, providing a clean channel for the printer.

Exam trap

The trap here is that candidates assume changing the 2.4 GHz channel (Option B) will solve the interference, but they overlook that microwave interference is broadband and affects all 2.4 GHz channels, making frequency migration to 5 GHz the only effective first step.

How to eliminate wrong answers

Option A is wrong because replacing the printer with a wired model is an unnecessary and costly solution; the issue is interference, not a hardware defect, and can be resolved by moving the printer to a non-interfering frequency. Option B is wrong because changing the 2.4 GHz channel only shifts the operating frequency within the same band, but microwave interference is broadband and typically affects all 2.4 GHz channels (especially channels 1–11), so the problem will persist regardless of the channel selected. Option D is wrong because updating the printer firmware addresses software bugs or compatibility issues, not physical-layer interference from a microwave; the printer's firmware cannot mitigate external RF noise in the 2.4 GHz band.

Full explanation →

188

MCQmedium

A network administrator notices that a managed switch is not reporting its status to the central monitoring system. The monitoring system uses a protocol that collects device information such as CPU load and interface errors. Which protocol is most likely not configured on the switch?

A.SNMP

B.SSH

C.HTTP

D.ICMP

AnswerA

SNMP is the protocol that polls managed devices for statistics such as CPU load and interface errors. If it is not configured on the switch, no status or performance data reaches the central monitoring system.

Why this answer

SNMP (Simple Network Management Protocol) is the standard protocol used by network monitoring systems to collect device information such as CPU load, interface errors, and uptime. If the managed switch is not reporting to the central monitoring system, SNMP is most likely not configured or its community strings are misconfigured, preventing the monitoring server from polling the switch.

Exam trap

A common pitfall is confusing ICMP (used for ping) with SNMP (used for management data collection).

How to eliminate wrong answers

Option B is wrong because SSH (Secure Shell) is used for secure remote administration and command-line access, not for collecting device statistics like CPU load or interface errors. Option C is wrong because HTTP (Hypertext Transfer Protocol) is used for web-based management interfaces, not for standardized device monitoring and data collection. Option D is wrong because ICMP (Internet Control Message Protocol) is used for basic connectivity testing (e.g., ping) and error reporting, not for polling structured management information from network devices.

Full explanation →

189

MCQmedium

A customer wants to use a portable projector with their smartphone for impromptu presentations. The smartphone has a USB-C port that supports DisplayPort Alt Mode. Which accessory will enable this connection?

A.A USB-C to USB-A adapter

B.A USB-C to HDMI adapter

C.A Bluetooth audio receiver

D.A wireless HDMI dongle

AnswerB

Many modern devices with USB-C ports support DisplayPort Alternate Mode (Alt Mode) or HDMI Alt Mode, allowing them to output high-definition video and audio signals directly over the USB-C connection. A USB-C to HDMI adapter specifically converts these Alt Mode signals into a standard HDMI format. This enables seamless connection to an HDMI-compatible portable projector, providing both visual and auditory content for presentations or media consumption.

Why this answer

The smartphone's USB-C port supports DisplayPort Alt Mode, which allows it to output a video signal over the USB-C connection. A USB-C to HDMI adapter converts this native DisplayPort signal into HDMI, enabling the portable projector to receive the video input. This is the standard accessory for connecting a USB-C device with DisplayPort Alt Mode to an HDMI display.

Exam trap

CompTIA A+ often tests the misconception that any USB-C adapter works for video, but only those explicitly supporting DisplayPort Alt Mode or containing the necessary conversion chip will output video to HDMI.

How to eliminate wrong answers

Option A is wrong because a USB-C to USB-A adapter only provides USB data and power, not video signal conversion, and cannot output DisplayPort Alt Mode video to a projector. Option C is wrong because a Bluetooth audio receiver handles only audio streaming, not video output, and is irrelevant for connecting to a projector. Option D is wrong because a wireless HDMI dongle requires a separate transmitter and receiver setup, and while it could work, it is not the direct wired accessory that enables the connection via the smartphone's USB-C DisplayPort Alt Mode; the question asks for the accessory that enables this connection, implying a direct cable solution.

Full explanation →

190

MCQmedium

A technician is setting up a new wireless network for a small office. The office has three access points (APs) that should allow seamless roaming. The technician configures all APs with the same SSID and security settings. What additional configuration is necessary to prevent clients from staying connected to a weak signal?

A.Set each AP to a different channel to avoid interference

B.Enable WPA3 encryption on all APs

C.Configure the APs with different SSIDs for each AP

D.Adjust the minimum RSSI value on each AP

AnswerD

Adjusting the minimum Received Signal Strength Indicator (RSSI) value on each Access Point (AP) is a direct method to influence client roaming behavior. When a client's signal strength drops below the configured minimum RSSI threshold, the AP will actively disassociate or deauthenticate that client. This action effectively forces the client device to scan for and connect to another AP with a stronger, more acceptable signal, thereby promoting efficient and timely roaming within the wireless network.

Why this answer

Adjusting the minimum RSSI (Received Signal Strength Indicator) value on each AP forces clients to roam away from an AP when the signal drops below a configured threshold. This prevents sticky clients from holding onto a weak signal, which is essential for seamless roaming in a multi-AP environment with the same SSID.

Exam trap

The trap here is that candidates often confuse channel planning (Option A) with client roaming mechanisms, assuming that avoiding interference automatically solves sticky client issues, when in fact roaming requires signal-based triggers like minimum RSSI.

How to eliminate wrong answers

Option A is wrong because setting each AP to a different channel is a standard practice to avoid co-channel interference, but it does not address client roaming behavior or signal strength thresholds. Option B is wrong because enabling WPA3 encryption provides stronger security but has no effect on client roaming decisions or signal-based disconnection. Option C is wrong because configuring different SSIDs per AP would break seamless roaming; clients would see separate networks and would need to manually reconnect, defeating the purpose of a unified wireless network.

Full explanation →

191

MCQeasy

A small office has intermittent network dropouts. A technician suspects electromagnetic interference (EMI) from nearby fluorescent lights affecting the unshielded twisted-pair (UTP) cables. Which tool can best confirm the presence of EMI on the cable?

A.Tone generator

B.Cable certifier

C.Ping

D.Wi-Fi analyzer

AnswerB

A cable certifier is a sophisticated diagnostic tool specifically engineered to perform comprehensive tests on network cabling, ensuring it meets TIA/ISO industry standards. It can precisely measure critical parameters such as signal attenuation, near-end crosstalk (NEXT), far-end crosstalk (FEXT), return loss, and, crucially, noise levels and external electromagnetic interference (EMI). By quantifying these factors, a certifier can definitively identify whether external sources like fluorescent lights or machinery are degrading signal integrity on UTP cables, leading to intermittent connectivity issues.

Why this answer

A cable certifier is the correct tool because it can measure crosstalk, return loss, and other electrical characteristics that reveal the presence of EMI on UTP cables. Unlike simple continuity testers, a certifier performs frequency-domain analysis (e.g., up to 500 MHz for Cat6a) to detect noise and interference that cause intermittent dropouts.

Exam trap

The CompTIA A+ exam often tests the distinction between tools that verify physical-layer compliance (certifier) versus tools that only indicate symptoms (ping) or operate on different media (Wi-Fi analyzer), leading candidates to mistakenly choose ping because it shows packet loss during dropouts.

How to eliminate wrong answers

Option A is wrong because a tone generator is used to trace and identify specific cables by injecting an audible signal, not to measure electromagnetic interference or noise on the cable. Option C is wrong because ping tests network connectivity and latency but cannot detect physical-layer issues like EMI; it only shows symptoms (packet loss) without identifying the root cause. Option D is wrong because a Wi-Fi analyzer monitors wireless spectrum (2.4/5 GHz) for RF interference, not conducted EMI on copper UTP cables, which is a different physical medium.

Full explanation →

192

MCQhard

A technician is troubleshooting a network where users on one floor cannot communicate with users on another floor. Both floors are connected to the same switch via separate VLANs configured for security. What additional device is needed to allow communication between the VLANs?

A.A hub

B.A Layer 2 switch

C.A router or Layer 3 switch

D.A bridge

AnswerC

A router or a Layer 3 switch is essential for inter-VLAN routing because both devices operate at Layer 3 (the network layer) of the OSI model, understanding IP addresses and subnet masks. They can maintain routing tables and forward IP packets between different IP subnets, effectively connecting distinct VLANs. This capability allows devices in separate logical network segments to communicate seamlessly, enabling complex network designs and security policies.

Why this answer

VLANs segment a Layer 2 network into separate broadcast domains, so hosts in different VLANs cannot communicate at Layer 2. To route traffic between VLANs, you need a Layer 3 device — either a router (with subinterfaces or separate physical interfaces) or a Layer 3 switch (with SVIs). This is the classic 'router-on-a-stick' or inter-VLAN routing scenario.

Exam trap

220-1201 often tests the difference between Layer 2 and Layer 3 devices — candidates pick a Layer 2 switch or bridge thinking it can route between VLANs, confusing VLAN trunking with inter-VLAN routing.

How to eliminate wrong answers

Option A is wrong because a hub is a Layer 1 device that simply repeats electrical signals; it cannot segment or route between VLANs and would actually worsen collisions. Option B is wrong because a Layer 2 switch forwards frames within VLANs but does not perform IP routing between them — it can trunk VLANs but cannot move traffic from one VLAN to another at Layer 3. Option D is wrong because a bridge is a Layer 2 device that connects network segments at the data-link layer; it does not perform IP routing and cannot route between VLANs.

Full explanation →

193

MCQhard

A technician is installing new cabling for a security camera system that uses PoE. The cameras are located 120 meters from the switch. The technician has Cat6 cable available. What should the technician do to ensure reliable operation?

A.Use a higher category cable like Cat6a to extend the distance.

B.Install a PoE extender or a switch at the 100-meter mark.

C.Use a single-mode fiber optic cable instead.

D.The cable run is acceptable because Cat6 supports up to 150 meters.

AnswerB

Installing a Power over Ethernet (PoE) extender or a network switch at approximately the 100-meter mark is the correct solution for extending both data and power delivery beyond the standard Ethernet distance limit. A PoE extender functions as a repeater, regenerating the electrical signal for data and re-injecting power to the connected device, effectively allowing the cable run to continue for another 100 meters. A switch would similarly regenerate the data signal and can provide new PoE power, acting as an intermediate node.

Why this answer

This question tests knowledge of Ethernet distance limits and solutions. The correct answer is to use a PoE extender or a switch at the midpoint, as 120 meters exceeds the 100-meter limit for Ethernet, and PoE may also have voltage drop issues.

Full explanation →

194

MCQeasy

A technician is upgrading a workstation from DDR3 to DDR4 memory. The motherboard currently has two DDR3 DIMM slots occupied. What must the technician verify before installing the new memory?

A.The CPU supports DDR4 memory

B.The motherboard has DDR4 DIMM slots

C.The power supply has a 4-pin connector for memory

D.The chipset supports dual-channel configuration

AnswerB

This is the correct answer because DDR4 memory modules are physically keyed differently from DDR3 modules, featuring a unique notch position and a higher pin count (288 pins for DDR4 versus 240 for DDR3). This physical and electrical incompatibility ensures that DDR4 modules can only be installed into motherboards specifically designed with DDR4 DIMM slots. Therefore, the presence of DDR4 slots on the motherboard is the fundamental prerequisite for upgrading from DDR3 to DDR4.

Why this answer

DDR3 and DDR4 have different notch positions and voltage requirements, so they are not interchangeable. The motherboard must physically support DDR4, which means it must have DDR4 DIMM slots. The CPU socket type and chipset are secondary; the key factor is the motherboard's memory generation support.

Full explanation →

195

MCQeasy

A user reports that their cloud-based file synchronization service stopped updating files after a recent OS update. The technician verifies the service is running and the internet connection is active. What should the technician check next?

A.Reinstall the sync client application

B.Check the sync client's authentication status

C.Disable the firewall temporarily

D.Increase the storage quota on the cloud account

AnswerB

OS updates frequently clear cached credentials or invalidate existing authentication tokens due to security policy changes or system component resets. This often requires the cloud sync client to re-establish its secure connection to the cloud service. Verifying and re-entering credentials ensures the client can properly authenticate and resume file synchronization, making this the most direct and common solution for post-update sync issues.

Why this answer

Cloud file sync issues often stem from authentication problems, such as expired credentials or session tokens. Since the service is running and connectivity is fine, the most likely cause is that the user's login token expired and needs re-authentication. Checking the sync logs would reveal the authentication failure.

Full explanation →

196

MCQhard

During a security audit, a technician discovers that an internal web server is responding on port 8080 instead of the standard HTTP port. What is the most likely reason for this configuration?

A.The server is running HTTPS on a non-standard port.

B.The server is configured as a web proxy or alternate HTTP server.

C.The server is running an FTP service.

D.The server is using a custom application protocol.

AnswerB

Port 8080 is a widely recognized alternative port for HTTP traffic, often employed when the standard HTTP port 80 is already in use, blocked by a firewall, or reserved for a different primary service. Web proxy servers frequently listen on port 8080 to intercept and forward web requests, and many development web servers or application servers also default to this port for their HTTP services. This makes it the most probable configuration for a server listening on 8080.

Why this answer

Port 8080 is commonly used as an alternate HTTP port, often for web proxy servers or secondary HTTP servers. This allows administrators to run a separate HTTP service without conflicting with the standard port 80, which is frequently used for caching proxies or development environments.

Exam trap

The trap here is that candidates often assume any non-standard port implies a custom protocol or security measure, but the A+ exam tests specific knowledge that port 8080 is the well-known alternate HTTP port, not a random or custom assignment.

How to eliminate wrong answers

Option A is wrong because HTTPS typically uses port 443, and while it can run on non-standard ports, port 8080 is not associated with HTTPS; the server would need a TLS certificate and port 443 is the standard. Option C is wrong because FTP services use ports 20 and 21, not port 8080. Option D is wrong because custom application protocols are not standardized on port 8080; port 8080 is specifically designated as an alternate HTTP port in the IANA service name registry.

Full explanation →

197

MCQeasy

A user complains that their laptop's touchpad cursor jumps erratically while typing. They have cleaned the touchpad surface, but the issue persists. Which configuration change should you try first?

A.Increase the touchpad sensitivity in the operating system settings.

B.Update the touchpad driver from the manufacturer's website.

C.Enable the 'Ignore accidental touches' or 'PalmCheck' feature in the touchpad settings.

D.Disable the touchpad entirely and use an external mouse.

AnswerC

Features like 'Ignore accidental touches' or 'PalmCheck' are specifically engineered into touchpad software to prevent unintended cursor movements caused by a user's palm or wrist brushing against the touchpad during typing. These settings intelligently differentiate between intentional finger input and accidental contact, temporarily disabling or reducing sensitivity to non-finger input. Enabling this feature directly addresses the reported symptom, making it the most effective and appropriate first troubleshooting step.

Why this answer

Erratic cursor movement while typing is a classic sign of palm rejection not working correctly. The most common fix is to enable the 'disable touchpad while typing' feature in the touchpad settings. This prevents accidental input from the user's palms during typing.

Full explanation →

198

MCQmedium

A technician is troubleshooting a network drop that was working yesterday but now has no link light. The cable run is 90 meters and uses Cat5e. The patch cables and switch ports have been tested and are fine. What is the most likely issue?

A.The cable is too long for Cat5e.

B.The cable has been cut or damaged.

C.The network switch is not powered on.

D.The cable is terminated with the wrong standard.

AnswerB

At 90 metres the run already exceeds the 100-metre channel limit once patch leads are added, but a sudden loss of link on a previously working drop points to physical damage. Testing confirms the patch cables and switch ports are sound, leaving the horizontal cable.

Why this answer

Since the cable run is 90 meters (within the 100-meter maximum for Cat5e), the patch cables and switch ports are verified working, and the link light is absent, the most likely cause is physical damage to the cable—such as a cut, pinch, or break—that interrupts the electrical continuity required for link pulses. A damaged cable prevents the switch and NIC from establishing a link, even if all other components are functional.

Exam trap

A common misconception is that a cable run of 90 meters is too long for Cat5e, but the actual limit is 100 meters, so candidates must remember the exact maximum distance and not assume any run near that limit is automatically faulty.

How to eliminate wrong answers

Option A is wrong because Cat5e supports a maximum segment length of 100 meters (including patch cables), and 90 meters is well within that limit, so length is not the issue. Option C is wrong because the switch ports have been tested and are fine, which implies the switch is powered on and operational; a powered-off switch would not show link lights on any port. Option D is wrong because using the wrong termination standard (e.g., T568A vs.

T568B) would still allow a link if both ends use the same standard (straight-through) or if the device supports auto-MDIX; it would not cause a sudden loss of link from working yesterday to not working today.

Full explanation →

199

MCQeasy

A customer reports their desktop PC is running extremely slow, especially when multiple applications are open. They mention they recently upgraded from Windows 10 to Windows 11. The system has 4 GB of RAM. What should you recommend as the most effective first step to improve performance?

A.Disable visual effects in Windows to reduce memory usage.

B.Upgrade the RAM to at least 8 GB.

C.Increase the size of the page file on the hard drive.

D.Reinstall Windows 10 to reduce system resource requirements.

AnswerB

Upgrading the RAM to at least 8 GB directly resolves the most common cause of a slow PC: insufficient physical memory. When a system lacks adequate RAM, it constantly resorts to using the slower hard drive (or SSD) as virtual memory, a process known as paging or swapping. Increasing RAM allows the operating system and applications to reside in much faster physical memory, significantly reducing disk I/O for memory management and dramatically improving overall system responsiveness and multitasking capabilities.

Why this answer

Windows 11 has a minimum requirement of 4 GB of RAM, but 8 GB is recommended for typical multitasking. Upgrading the RAM directly addresses the bottleneck caused by insufficient memory, which is the most likely cause of the slowdown with multiple applications.

Full explanation →

200

MCQeasy

A customer reports that they cannot send emails from their desktop email client, but they can receive emails. The email server is running on the local network. Which port is most likely blocked on the firewall?

A.25

B.110

C.143

D.993

AnswerA

Port 25 is the standard, unencrypted port designated for the Simple Mail Transfer Protocol (SMTP), which is exclusively used for sending outgoing email messages between mail servers and from email clients to a mail server. If a firewall or network security device is blocking outbound traffic on port 25, an email client will be unable to establish a connection with the outgoing mail server, directly preventing the customer from sending emails. While port 587 (Submission) is now commonly used by clients for authenticated sending, port 25 remains critical for server-to-server email transfer.

Why this answer

Port 25 is the default SMTP port used for sending email. If the firewall blocks outbound or inbound traffic on port 25, the desktop email client cannot establish an SMTP connection to the local email server, preventing email transmission while still allowing reception via other protocols.

Exam trap

The trap here is that candidates may confuse port 110 (POP3) or 143 (IMAP) as being involved in sending email because they are commonly associated with email reception, but they are actually for receiving email.

How to eliminate wrong answers

Option B (110) is wrong because port 110 is POP3, used for receiving email, not sending. Option C (143) is wrong because port 143 is IMAP, also used for receiving email. Option D (993) is wrong because port 993 is IMAPS (IMAP over SSL), used for secure email retrieval, not sending.

Full explanation →

201

MCQhard

A company uses a public cloud provider for compute resources. To reduce costs, they want to use unused capacity at a lower price but accept that the instance may be terminated with short notice. Which pricing model should they choose?

A.On-demand instance

B.Reserved instance

C.Spot instance

D.Dedicated host

AnswerC

Spot instances leverage unused cloud provider capacity, offering significantly reduced pricing compared to on-demand instances, often up to 90% savings. The trade-off is that these instances can be interrupted or terminated by the cloud provider with short notice (typically two minutes) if the capacity is needed elsewhere. This makes them perfectly suited for fault-tolerant applications, batch jobs, or flexible workloads that can handle interruptions and restart processes without significant impact.

Why this answer

Spot instances (also called Spot VMs or preemptible instances) let you bid on a cloud provider's unused compute capacity at steep discounts — often 70-90% below on-demand pricing. The trade-off is that the provider can reclaim (terminate) the instance with only a short warning (typically 2 minutes on AWS), which matches the company's stated willingness to accept short-notice termination in exchange for lower cost.

Exam trap

The trap here is confusing reserved instances (commitment discount, no interruption) with spot instances (spare-capacity discount, interruptible) — candidates see 'lower price' and pick reserved without noticing the 'may be terminated with short notice' clause.

How to eliminate wrong answers

Option A is wrong because on-demand instances provide no cost savings — you pay full hourly price with no commitment or interruption risk, which contradicts the cost-reduction goal. Option B is wrong because reserved instances require a 1- or 3-year commitment in exchange for a discount, and they are not terminated on short notice; they are the opposite of the flexible, interruptible model described. Option D is wrong because a dedicated host provides physical isolation of the server hardware for licensing or compliance reasons and is typically the most expensive option, not a discounted use of spare capacity.

Full explanation →

202

MCQmedium

A technician is troubleshooting a PC that randomly restarts under load. The CPU temperature is normal, but the system sometimes fails to POST with a 'CPU Overvoltage Error'. The motherboard is a few years old. What is the most likely cause?

A.The CPU is overheating due to a failing cooler

B.The power supply is delivering too much voltage

C.The motherboard VRM is failing

D.The BIOS needs to be updated to support the CPU

AnswerC

The Voltage Regulator Module (VRM) on the motherboard is responsible for converting the 12V input from the power supply into the precise, lower voltages required by the CPU. A failing VRM can become unstable, delivering incorrect or fluctuating voltages, including sudden spikes that exceed the CPU's safe operating limits. These overvoltage conditions trigger the CPU's or motherboard's built-in overvoltage protection, causing the system to randomly restart or shut down to prevent permanent damage to the CPU.

Why this answer

A 'CPU Overvoltage Error' at POST on an older motherboard points to a failing voltage regulator module (VRM) that is no longer delivering stable voltage to the CPU. Random restarts under load are consistent with VRM degradation, especially when the CPU temperature is normal. The VRM is the component responsible for converting the PSU's 12V rail to the low voltage the CPU needs.

Exam trap

220-1201 often tests the misconception that a CPU overvoltage error is caused by the power supply; the correct answer is the motherboard VRM, since the PSU does not directly supply the CPU voltage.

How to eliminate wrong answers

Option A is wrong because the CPU temperature is normal, so overheating due to a failing cooler is not the cause. Option B is wrong because the power supply delivers 12V, 5V, and 3.3V rails; the CPU voltage is derived by the motherboard VRM, so a PSU delivering too much voltage would not produce a CPU overvoltage error specifically. Option D is wrong because a BIOS update issue would typically cause a CPU not recognized error or instability from the start, not a random overvoltage error under load on a system that previously worked.

Full explanation →

203

MCQeasy

A company wants to allow employees to securely access the corporate network from home using their laptops. Which network service should be deployed to provide encrypted remote access?

A.DHCP

B.DNS

C.VPN

D.Port forwarding

AnswerC

A VPN builds an encrypted tunnel across the public internet between the employee's laptop and a corporate gateway, protecting data in transit and authenticating the remote user. It satisfies the encrypted remote access requirement without dedicated leased circuits to each home.

Why this answer

C is correct because a Virtual Private Network (VPN) creates an encrypted tunnel between the employee's laptop and the corporate network, typically using protocols such as IPsec or TLS. This ensures that all data transmitted over the public internet is confidential and integrity-protected, meeting the requirement for secure remote access.

Exam trap

CompTIA A+ often tests the misconception that port forwarding alone provides secure remote access, but candidates must remember that port forwarding lacks encryption and authentication, making it insecure for remote connectivity.

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, not to provide encryption or secure remote access. Option B is wrong because DNS (Domain Name System) translates domain names to IP addresses and does not offer any encryption or secure tunneling capabilities. Option D is wrong because port forwarding is a NAT technique that maps external ports to internal IP addresses and ports; it does not encrypt traffic and exposes internal services directly to the internet without security.

Full explanation →

204

MCQeasy

A technician is configuring a new web server that must support both standard HTTP and HTTPS traffic. Which two ports should be opened in the firewall?

A.80 and 443

B.21 and 22

C.8080 and 8443

D.25 and 110

AnswerA

Ports 80 and 443 satisfy the requirement for both standard HTTP and HTTPS traffic. Port 80 carries unencrypted HTTP, while port 443 carries HTTP over TLS, providing the encryption HTTPS requires. Opening both in the firewall allows the web server to serve plain and secure requests simultaneously.

Why this answer

Standard HTTP traffic uses TCP port 80, and HTTPS (HTTP over TLS/SSL) uses TCP port 443. A web server must have both ports open in the firewall to serve unencrypted and encrypted web content respectively, as defined in RFC 7230 and RFC 2818.

Exam trap

CompTIA A+ exams often test the distinction between default well-known ports (80/443) and alternative ports (8080/8443) to catch candidates who confuse common development proxies with standard service ports.

How to eliminate wrong answers

Option B is wrong because ports 21 and 22 are used for FTP and SSH respectively, not for web traffic. Option C is wrong because ports 8080 and 8443 are alternative (non-standard) ports often used for proxy or development servers, not the default ports for HTTP and HTTPS. Option D is wrong because ports 25 and 110 are used for SMTP (email sending) and POP3 (email retrieval), not for web serving.

Full explanation →

205

MCQhard

A user reports that their LCD monitor intermittently goes black for 2-3 seconds, then returns to normal. This happens randomly, not during any specific activity. The monitor's power LED stays green during the blackouts. Which component is most likely failing?

A.The video cable is loose

B.The graphics card is overheating

C.The monitor's backlight or inverter is failing

D.The monitor's power supply is failing

AnswerC

Intermittent failure of the monitor's backlight (either CCFL tubes or LED arrays) or its associated inverter circuit (for CCFLs) is a classic symptom for this issue. When the backlight fails, the screen goes dark because there is no illumination, but the LCD panel itself continues to receive video data and the monitor's internal power supply remains active. This scenario perfectly matches the description of the screen going dark while the monitor's power LED stays green, indicating the monitor is still powered on and receiving a signal.

Why this answer

Intermittent blackouts of 2-3 seconds where the power LED stays green indicate the monitor is still powered and receiving a signal, but the backlight or inverter is failing to keep the panel illuminated. A failing backlight or inverter causes the screen to go dark while the monitor remains on, matching the symptom of a green LED during blackouts. This is a classic hardware failure pattern for LCD monitors.

Exam trap

The trap is attributing blackouts to power or cable issues, when a steady green LED during blackouts points specifically to the backlight or inverter.

How to eliminate wrong answers

Option A is wrong because a loose video cable would typically cause signal loss, color distortion, or a 'no signal' message, and the power LED would usually change color or the monitor would display an input warning, not stay green with a brief blackout. Option B is wrong because an overheating graphics card would more likely cause artifacts, driver crashes, or system-wide display issues, not isolated monitor blackouts with the monitor LED unaffected. Option D is wrong because a failing monitor power supply would cause the monitor to lose power entirely, turning off the LED or causing it to blink, rather than staying green during the blackout.

Full explanation →

206

MCQhard

A technician is installing a power supply in a new build. The case has a bottom-mounted PSU bay with a dust filter. The technician notices that the PSU fan faces downward. Is this correct?

A.No, the fan should face upward to exhaust hot air from inside the case.

B.Yes, the fan should face downward to draw cool air from outside the case.

C.No, the PSU should be mounted fan-up to prevent dust from entering.

D.The orientation does not matter as long as the PSU is securely mounted.

AnswerB

The correct orientation for a bottom-mounted power supply is with the fan facing downward, drawing cool, ambient air directly from outside the case. This configuration utilizes the dedicated filtered intake vent typically found at the bottom of modern PC cases, ensuring the PSU receives a constant supply of fresh, clean air. This optimizes the PSU's cooling efficiency, maintains stable internal temperatures, and prevents it from contributing to the overall heat load inside the system, thereby enhancing component longevity and system stability.

Why this answer

In a bottom-mounted PSU configuration, the fan should face downward to draw cool air from outside the case through the dust filter. This improves cooling efficiency and reduces dust buildup inside the case.

Full explanation →

207

MCQhard

A customer brings in a PC that was working fine until they moved it to a new desk. Now it powers on but immediately shuts off after 2 seconds. The technician notes that the CPU fan does not spin at all. What is the most likely cause?

A.The power supply is failing under load.

B.The CPU fan header is disconnected from the motherboard.

C.The CPU is not seated properly.

D.The case power button is stuck in the pressed position.

AnswerB

Modern motherboards incorporate critical safety features, including CPU fan monitoring. If the motherboard's CPU fan header is disconnected or the fan itself is faulty, the system's BIOS/UEFI firmware will detect the absence of a CPU fan signal during the Power-On Self-Test (POST) or initial boot sequence. To prevent potential thermal damage to the CPU, the system will immediately initiate a protective shutdown, often within seconds of power-on, regardless of the actual CPU temperature. This rapid shutdown is a preventative measure.

Why this answer

A CPU fan that does not spin at all, combined with an immediate shutdown after ~2 seconds, points to the motherboard's fan tachometer not receiving a signal — typically because the CPU fan header is disconnected. Many systems perform a POST check and halt/shut down if no CPU fan RPM is detected to prevent overheating.

Exam trap

220-1201 often tests the link between a non-spinning CPU fan and the motherboard's fan-detection shutdown, tempting candidates to blame the PSU or CPU seating instead of the simple disconnected header.

How to eliminate wrong answers

Option A is wrong because a failing PSU under load usually causes random shutdowns under stress or failure to POST, not an immediate 2-second shutdown tied specifically to a non-spinning CPU fan. Option C is wrong because a mis-seated CPU typically results in no POST, beep codes, or no display — not a fan that fails to spin. Option D is wrong because a stuck power button would cause the system to power on and immediately power off, but it would not explain the CPU fan not spinning; the fan would still spin briefly.

Full explanation →

208

MCQhard

A user reports that their smartphone's mobile hotspot works for a few minutes, then the connected laptop loses internet access, but the smartphone still shows a cellular data connection. The hotspot remains enabled. What is the most likely cause?

A.The smartphone's battery saver mode is limiting hotspot performance.

B.The carrier is throttling the hotspot data after a usage threshold.

C.The laptop's Wi-Fi adapter is overheating.

D.The smartphone is switching to a different cellular band.

AnswerB

Many mobile carriers implement specific data allowances for mobile hotspot usage, which are often separate from or a subset of the phone's general data plan. Once this usage threshold is met, the carrier intentionally reduces (throttles) the hotspot's connection speed to a very low rate, making it practically unusable for loading web pages or streaming, even though the hotspot connection itself remains active. This behavior perfectly matches the symptom of data stopping after a few minutes while the hotspot is still enabled and the phone has data.

Why this answer

The scenario describes a hotspot that works initially but then stops providing internet to the laptop while the smartphone still shows cellular data. This is a classic symptom of carrier throttling: many mobile plans have a separate high-speed hotspot data allowance, after which the carrier throttles the hotspot connection to 2G speeds or blocks it entirely. The smartphone itself retains cellular data because the throttling applies only to tethered devices, not the phone's own data usage.

Thus, the most likely cause is that the carrier is throttling the hotspot data after a usage threshold.

Exam trap

The trap here is that candidates may focus on the smartphone's battery saver or the laptop's Wi-Fi adapter, overlooking the carrier's role in throttling hotspot data after a usage threshold, which is a common real-world issue.

How to eliminate wrong answers

Option A is wrong because battery saver mode typically reduces background activity and may disable hotspot after inactivity, but it would not cause the hotspot to remain enabled while the laptop loses internet; it would more likely turn off the hotspot entirely. Option C is wrong because a laptop Wi-Fi adapter overheating would cause the laptop to lose connection to the hotspot entirely, not just internet access, and the hotspot would still be visible; also, the smartphone would not show a cellular data connection if the laptop's adapter failed. Option D is wrong because switching cellular bands is a normal handover process that does not cause persistent loss of internet for tethered devices; it might cause a brief interruption but not a sustained loss while the phone retains data.

Full explanation →

209

MCQmedium

A technician is setting up a new web server that must be accessible from the internet using HTTPS. The server is behind a firewall that performs port forwarding. After configuration, external users cannot reach the server, but internal users can. Which protocol and port combination must be forwarded to the server?

A.TCP 80

B.UDP 443

C.TCP 443

D.TCP 3389

AnswerC

HTTPS uses TCP 443, so the firewall must forward inbound TCP 443 to the web server's internal address. Internal users succeed because they reach the server directly, bypassing the firewall's port-forwarding rule, which explains why only external access fails.

Why this answer

HTTPS uses TCP port 443 by default. Since the server must be accessible from the internet via HTTPS, the firewall must forward TCP port 443 to the server's internal IP address. Internal users can reach the server because they are on the same local network and bypass the firewall's port forwarding rule, but external traffic on port 443 is blocked unless the rule is correctly configured.

Exam trap

Candidates often mistakenly choose UDP 443 due to confusion with QUIC or DNS, but the CompTIA A+ exam expects TCP 443 as the standard for HTTPS traffic.

How to eliminate wrong answers

Option A is wrong because TCP port 80 is used for HTTP, not HTTPS; forwarding port 80 would only allow unencrypted web traffic. Option B is wrong because UDP 443 is not the standard transport for HTTPS; HTTPS relies on TCP for reliable, ordered delivery, and while QUIC uses UDP 443, the question specifies HTTPS (which traditionally uses TCP). Option D is wrong because TCP 3389 is used for Remote Desktop Protocol (RDP), not for web server traffic.

Full explanation →

210

MCQeasy

A small office uses a wireless printer that supports Wi-Fi Direct. Several employees want to print from their smartphones without connecting to the company's wireless network. What is the simplest way to achieve this?

A.Connect the printer to the office router via Ethernet.

B.Enable the printer's Bluetooth and pair each phone.

C.Use the printer's Wi-Fi Direct feature to connect each phone directly.

D.Install a USB hub and connect all phones to the printer.

AnswerC

Wi-Fi Direct is the most suitable solution as it allows the printer to create its own secure, peer-to-peer wireless network, enabling smartphones to connect directly to the printer without requiring an existing Wi-Fi router or network. This feature simplifies the printing process for multiple mobile users by bypassing the need for network configuration or a central access point, offering a fast and efficient direct connection.

Why this answer

Wi-Fi Direct allows devices to connect peer-to-peer without a traditional wireless access point. Since the printer supports Wi-Fi Direct, each smartphone can connect directly to the printer's own Wi-Fi Direct network, enabling printing without joining the company's wireless network. This is the simplest method because it requires no additional hardware or network configuration.

Exam trap

Candidates often confuse Wi-Fi Direct and Bluetooth as peer-to-peer wireless methods; the trap here is that they may overlook Wi-Fi Direct's superior speed and range for printing tasks, which is a common CompTIA A+ exam point.

How to eliminate wrong answers

Option A is wrong because connecting the printer to the office router via Ethernet would require the smartphones to be on the same network as the printer, which contradicts the requirement of not connecting to the company's wireless network. Option B is wrong because the printer supports Wi-Fi Direct, not Bluetooth; Bluetooth printing would require the printer to have Bluetooth hardware and would typically offer slower speeds and shorter range than Wi-Fi Direct. Option D is wrong because USB hubs are designed for connecting multiple USB devices to a single host, not for connecting multiple phones to a printer; smartphones do not typically support USB host mode for printing, and this would be impractical and unsupported.

Full explanation →

211

MCQeasy

A technician is replacing a power supply in an office desktop. The new PSU has a 24-pin main connector, but the motherboard has a 20-pin socket. What should the technician do?

A.Use a 24-pin to 20-pin adapter.

B.Force the 24-pin connector into the 20-pin socket.

C.Separate the detachable 4-pin section from the 24-pin connector and use the remaining 20-pin part.

D.Return the PSU and buy one with a 20-pin connector.

AnswerC

Modern ATX power supplies commonly feature a 24-pin main power connector that includes a detachable 4-pin section. This thoughtful design allows the power supply to be fully compatible with both newer motherboards requiring all 24 pins and older motherboards that only utilize a 20-pin main power input. By separating the modular 4-pin segment, the remaining 20-pin connector fits perfectly, providing stable power without the need for adapters or modifications.

Why this answer

Most modern ATX power supplies use a 24-pin main connector whose last 4 pins are a detachable section, specifically designed so the same PSU can power older 20-pin motherboards. The technician simply separates that 4-pin block and plugs the remaining 20-pin portion into the socket, aligning the retention clip. This is the manufacturer-intended method and requires no adapter or modification.

Exam trap

220-1201 often tests whether candidates know the 24-pin connector's last 4 pins are detachable for 20-pin compatibility, rather than assuming an adapter or brute force is required.

How to eliminate wrong answers

Option A is wrong because a 24-to-20-pin adapter is unnecessary when the connector is already split-able; adding an adapter introduces extra resistance and a potential failure point for no benefit. Option B is wrong because physically forcing a 24-pin connector into a 20-pin socket will not fit — the extra 4 pins have nowhere to go and forcing it can bend pins and destroy the motherboard. Option D is wrong because returning the PSU is wasteful and unnecessary; virtually all modern PSUs are backward-compatible with 20-pin boards via the detachable section, so a dedicated 20-pin PSU is rarely needed.

Full explanation →

212

MCQeasy

A user wants to boot their laptop from a USB flash drive to run a diagnostic tool. They have already inserted the USB drive and restarted the system. What is the most efficient way to temporarily change the boot order to boot from the USB drive?

A.Enter the UEFI setup and change the boot order permanently.

B.Press the appropriate key to open the one-time boot menu and select the USB drive.

C.Disable Secure Boot in the UEFI settings.

D.Remove all other bootable drives from the system.

AnswerB

Pressing the appropriate function key (commonly F12, F10, Esc, or F9, depending on the manufacturer) to access the one-time boot menu is the most efficient and recommended solution for booting from a USB drive temporarily. This menu allows the user to select a specific boot device for the current startup session without making any permanent changes to the system's UEFI/BIOS boot order settings. It provides a quick, non-disruptive way to initiate a boot from an alternative medium, such as a USB installation or recovery drive.

Why this answer

The one-time boot menu (often accessed via F12, F9, Esc, or a vendor-specific key) allows the user to select a boot device for the current boot only, without permanently altering the UEFI boot order. This is the most efficient method because it is temporary, fast, and does not require navigating full UEFI setup.

Exam trap

220-1201 often tests the difference between temporary and permanent boot order changes — candidates may choose UEFI setup because it is familiar, but the question asks for the most efficient temporary method, which is the one-time boot menu.

How to eliminate wrong answers

Option A is wrong because entering UEFI setup and changing the boot order permanently is slower and modifies the system configuration unnecessarily. Option C is wrong because disabling Secure Boot is not required to boot from a USB drive in most cases and introduces a security risk; it is also an extra step. Option D is wrong because removing other bootable drives is a physical, invasive step that is unnecessary when a one-time boot menu is available.

Full explanation →

213

MCQeasy

A customer brings in a laptop that will not charge. The technician checks the AC adapter with a multimeter and gets 19V output. When the adapter is plugged into the laptop, the charging LED does not illuminate. What should the technician check next?

A.Replace the laptop's battery

B.Test the DC jack for continuity

C.Update the laptop's BIOS

D.Replace the AC adapter with a universal one

AnswerB

Testing the DC jack for continuity is the most appropriate next step because a broken or damaged DC jack is a common point of failure for power delivery. Even if the AC adapter outputs the correct voltage, a physical break, loose solder joint, or internal short within the jack itself will prevent power from reaching the laptop's internal components and charging circuitry. A multimeter can quickly verify if the electrical path from the jack's input to the motherboard is intact.

Why this answer

The AC adapter outputs the correct 19V, so the adapter itself is functional. Since the charging LED does not illuminate when connected, the fault likely lies between the adapter and the motherboard — most commonly the DC jack, which can suffer from broken solder joints, bent pins, or physical damage. Testing the DC jack for continuity verifies whether power can actually reach the motherboard.

Exam trap

220-1201 often tests the troubleshooting principle of verifying the simplest link in the power chain first — candidates jump to replacing the battery or adapter instead of testing the DC jack, which is the actual failure point when the adapter tests good but no charging occurs.

How to eliminate wrong answers

Option A is wrong because a failed battery would not prevent the charging LED from illuminating — the LED indicates power input, not battery health. Option C is wrong because BIOS updates do not affect basic charging circuitry and would not explain a dead charging LED. Option D is wrong because the existing adapter already outputs the correct 19V, so replacing it with a universal adapter addresses a non-existent problem.

Full explanation →

214

MCQhard

A user’s laptop connects to the corporate Wi-Fi but cannot access the internet. Other devices on the same SSID work fine. The technician checks the laptop’s IP configuration and sees an IPv4 address of 169.254.12.34. What is the most likely cause of this issue?

A.The laptop is connected to the wrong SSID

B.The DHCP server is out of addresses

C.The laptop’s wireless adapter is faulty

D.The laptop’s DHCP client is disabled or malfunctioning

AnswerD

The 169.254.12.34 address is APIPA, assigned when the laptop's DHCP client fails to obtain a lease. Other devices on the same SSID received valid addresses, so the DHCP server is working; the fault is local to this laptop's disabled or malfunctioning DHCP client service.

Why this answer

The 169.254.x.x address is an Automatic Private IP Addressing (APIPA) address, assigned by Windows when the DHCP client fails to obtain a lease from a DHCP server. Since other devices on the same SSID work fine, the DHCP server is functional and has available addresses, isolating the issue to the laptop's DHCP client service being disabled or malfunctioning, which prevents it from requesting or renewing an IP address.

Exam trap

CompTIA A+ often tests the misconception that a 169.254.x.x address always indicates a DHCP server problem, but the key detail here is that other devices work, which shifts the fault to the client's DHCP client service rather than the server.

How to eliminate wrong answers

Option A is wrong because the laptop is already connected to the corporate Wi-Fi (same SSID as working devices), so being on the wrong SSID would not yield a 169.254.x.x address—it would either get a valid IP from that SSID's DHCP or fail to connect entirely. Option B is wrong because if the DHCP server were out of addresses, other devices on the same SSID would also fail to obtain an IP and would likely show APIPA addresses, but they work fine, indicating the server has available leases. Option C is wrong because a faulty wireless adapter would typically prevent association or cause intermittent connectivity, not result in a specific APIPA address; the adapter is functioning enough to connect and receive an IP configuration, just not from DHCP.

Full explanation →

215

MCQhard

A company is migrating a critical application from a physical server to a virtual machine. The application requires a static MAC address tied to its license. The technician performs a P2V migration and starts the VM, but the application fails to activate. The technician verifies that the VM has the same MAC address as the original physical server. What is the most likely cause of the activation failure?

A.The virtual switch is set to NAT, blocking the license server

B.The VM's BIOS UUID has changed from the physical server

C.The VM has insufficient RAM allocated

D.The hypervisor does not support the application's OS

AnswerB

Many critical applications and operating systems employ licensing schemes that bind the software's activation to specific hardware identifiers to prevent unauthorized use. The BIOS UUID (Universally Unique Identifier) is a common identifier used for this purpose, as it is designed to be unique to each physical machine. When an application is migrated from a physical server to a virtual machine, the hypervisor generates a new, different BIOS UUID for the VM, which the application's licensing mechanism detects as a change in the underlying system, leading to activation failure.

Why this answer

The [CORRECT] answer is B. During a P2V migration, the hypervisor generates a new BIOS UUID (also called the system UUID or SMBIOS UUID) for the virtual machine, even if the MAC address is manually preserved. Many license activation systems bind the license to a hardware fingerprint that includes the BIOS UUID, motherboard serial, and other SMBIOS identifiers—not just the MAC address.

Since the UUID changed, the application sees a different machine and refuses to activate.

Exam trap

The trap here is assuming that preserving the MAC address is sufficient to preserve the hardware fingerprint; candidates overlook that the BIOS UUID is a separate, hypervisor-generated identifier that licensing systems also check.

How to eliminate wrong answers

Option A is wrong because a virtual switch set to NAT would affect network reachability to the license server, but the scenario states the technician verified the MAC address and the VM boots; NAT would typically cause a total activation failure due to no connectivity, not a license fingerprint mismatch, and NAT is not the default vSwitch mode that would silently break activation. Option C is wrong because insufficient RAM would cause performance problems or boot failures, not a license activation failure—the application would still be able to read its license binding. Option D is wrong because if the hypervisor did not support the guest OS, the VM would not boot or would crash, not run and fail only at license activation.

Full explanation →

216

MCQmedium

A user reports that they can access internal resources using IP addresses but cannot access them using hostnames. Other users on the same network have no issues. What is the most likely cause?

A.The DHCP server is out of addresses

B.The DNS server is down

C.The user's DNS settings are incorrect

D.The router's NAT is misconfigured

AnswerC

When a user's device has incorrect or missing DNS server entries, it cannot translate human-readable hostnames into their corresponding IP addresses. However, if the user can still access internal resources by their direct IP addresses, it confirms that basic network connectivity and IP configuration are functional. This specific scenario precisely indicates a client-side DNS configuration problem, where the device simply doesn't know where to ask for hostname resolution.

Why this answer

The ability to use IP addresses but not hostnames points to a DNS resolution problem on the user's device. This could be due to a misconfigured DNS server address in the network settings or a local hosts file issue. Other users working normally suggests the problem is client-specific.

Full explanation →

217

MCQhard

A network administrator needs to allow secure remote administration of a router using SSH. The router is configured to use the default SSH port. Which port must be opened on the firewall?

A.22

B.23

C.161

D.443

AnswerA

SSH listens on TCP port 22 by default, so the firewall must permit inbound TCP 22 to the router for secure remote administration. Port 23 is Telnet, which is unencrypted, and 443 is HTTPS, so neither satisfies the SSH requirement.

Why this answer

SSH (Secure Shell) operates on TCP port 22 by default. To allow secure remote administration of the router, the firewall must permit inbound TCP traffic on port 22. This enables encrypted management sessions, unlike Telnet which uses unencrypted port 23.

Exam trap

In the CompTIA A+ exam, candidates often confuse SSH (port 22) with Telnet (port 23). Since the question specifies 'secure' remote administration, the correct answer is SSH port 22, not Telnet's unencrypted port 23.

How to eliminate wrong answers

Option B is wrong because port 23 is used by Telnet, which transmits data in plaintext and is not secure for remote administration. Option C is wrong because port 161 is used by SNMP for network management polling, not for remote shell access. Option D is wrong because port 443 is used by HTTPS for secure web traffic, not for SSH remote administration.

Full explanation →

218

MCQeasy

A customer wants to connect two switches in different buildings about 150 meters apart. The link must support at least 1 Gbps. Which cabling solution is most appropriate?

A.Cat6a copper cable.

B.Cat5e copper cable with a repeater.

C.Single-mode fiber optic cable.

D.Coaxial cable with a balun.

AnswerC

Single-mode fiber optic cable is engineered for high-speed data transmission over very long distances, typically supporting Gigabit and 10 Gigabit Ethernet for tens of kilometers. Its small core diameter allows light to travel along a single path, minimizing modal dispersion and signal loss. This makes it the ideal choice for connecting switches located 150 meters apart, ensuring reliable, high-bandwidth connectivity.

Why this answer

Single-mode fiber optic cable is the most appropriate solution because it supports 1 Gbps over distances far exceeding 150 meters, with typical reach up to 10 km or more. Unlike copper cabling, single-mode fiber is immune to electromagnetic interference (EMI) and signal degradation over longer runs, making it ideal for inter-building connections where electrical isolation and distance are critical factors.

Exam trap

The 100-meter distance limitation for copper Ethernet cabling (Cat5e, Cat6, Cat6a) is a common testing point; any run beyond 100 meters requires fiber or a repeater, but the most appropriate and scalable solution for inter-building links is fiber, not copper with repeaters.

How to eliminate wrong answers

Option A is wrong because Cat6a copper cable is limited to a maximum distance of 100 meters for 10GBASE-T (and 1 Gbps over 100 meters), so it cannot reliably span 150 meters without signal loss or the need for a repeater. Option B is wrong because Cat5e copper cable with a repeater introduces an active component that adds cost, complexity, and potential points of failure, and Cat5e itself is only rated for 1 Gbps up to 100 meters; using a repeater for a 150-meter link is less efficient and less reliable than fiber. Option D is wrong because coaxial cable with a balun is typically used for legacy video or RF applications, not for modern 1 Gbps Ethernet, and it lacks the bandwidth and standardized support for Gigabit Ethernet over such distances.

Full explanation →

219

MCQmedium

A user complains that their laptop frequently disconnects from the Wi-Fi when they move from their desk to a conference room 30 meters away. The office uses a single wireless access point (AP). Which network type is being used, and what is the most likely cause of the disconnection?

A.Ad hoc network; the laptop is trying to connect directly to other devices.

B.Infrastructure mode WLAN; the AP's signal strength is insufficient at that distance.

C.Mesh network; the laptop is roaming between mesh nodes.

D.PAN network; the laptop is using Bluetooth, which has limited range.

AnswerB

Infrastructure mode utilizes an Access Point (AP) to manage wireless connections and provide network access. A distance of 30 meters can significantly attenuate the Wi-Fi signal, especially with walls or other obstructions, leading to insufficient signal strength for a stable connection and frequent disconnections.

Why this answer

The scenario describes an infrastructure mode WLAN, where devices connect through a single access point. The disconnection at 30 meters is most likely due to insufficient signal strength from that AP, as typical consumer-grade Wi-Fi (e.g., 2.4 GHz) has an effective indoor range of about 30–40 meters, and obstacles or interference can further reduce it.

Exam trap

The 220-1201 exam often tests the distinction between infrastructure mode and ad hoc or mesh networks, trapping candidates who confuse a single-AP setup with a mesh or who incorrectly attribute disconnections to roaming rather than signal strength.

How to eliminate wrong answers

Option A is wrong because an ad hoc network involves direct device-to-device connections without an AP, but the user is connecting through a single AP, which is infrastructure mode. Option C is wrong because a mesh network uses multiple interconnected APs to extend coverage, but the office has only a single AP, so roaming between mesh nodes is not possible. Option D is wrong because a PAN (Personal Area Network) typically uses Bluetooth, which has a range of about 10 meters, but the user is connecting to Wi-Fi, not Bluetooth, and the distance is 30 meters, far exceeding Bluetooth's range.

Full explanation →

220

MCQmedium

A user needs to transfer files securely between two Linux servers over the internet. Which port should be allowed through the firewall for this purpose?

A.21

B.22

C.20

D.443

AnswerB

Port 22 is the standard port for the Secure Shell (SSH) protocol, which establishes a secure, encrypted channel over an unsecured network. Secure File Transfer Protocol (SFTP) leverages this SSH connection to encrypt both the data and the commands exchanged during file transfers. This robust encryption, coupled with strong authentication mechanisms, makes Port 22 the correct choice for securely transferring files between two systems, ensuring confidentiality and integrity.

Why this answer

Secure file transfer between Linux servers typically uses SCP (Secure Copy) or SFTP (SSH File Transfer Protocol), both of which operate over SSH. SSH uses TCP port 22 by default, so allowing port 22 through the firewall enables encrypted authentication and data transfer. This is the correct choice because it provides confidentiality and integrity for the file transfer over the internet.

Exam trap

The trap here is that candidates often confuse FTP (ports 20/21) with secure file transfer, forgetting that FTP lacks encryption, or they mistakenly think HTTPS (port 443) is the standard for server-to-server file transfers, when SSH on port 22 is the correct protocol for secure Linux-to-Linux transfers.

How to eliminate wrong answers

Option A is wrong because port 21 is used for FTP control, which transmits credentials and data in cleartext, making it insecure for transfers over the internet. Option C is wrong because port 20 is used for FTP data transfer in active mode, but like port 21, it lacks encryption and is not suitable for secure transfers. Option D is wrong because port 443 is used for HTTPS (HTTP over TLS), which is designed for web traffic, not for direct file transfer between Linux servers via SCP or SFTP.

Full explanation →

221

MCQmedium

A technician is configuring a dual-monitor setup for a stock trader. One monitor is a 24-inch 1080p display, and the other is a 27-inch 4K display. The user wants the mouse to move seamlessly between them. What setting must the technician configure in the OS display settings?

A.Set both monitors to the same resolution.

B.Adjust the scaling settings on the 4K monitor.

C.Arrange the displays in the OS to match their physical positions.

D.Set the 4K monitor as the primary display.

AnswerC

Arranging the displays within the operating system's display settings to accurately reflect their physical placement is critical for seamless mouse cursor navigation. This configuration establishes the logical boundaries and adjacency of each monitor, allowing the OS to correctly interpret when the cursor moves off the edge of one screen and onto the corresponding edge of another. Without this proper alignment, the mouse cursor may not transition as expected, appearing on a different screen or requiring an incorrect path to move between them.

Why this answer

The OS display arrangement settings (e.g., in Windows Display Settings or macOS Displays) allow the technician to drag and position the virtual representations of the monitors to match their physical placement. This ensures that the cursor moves seamlessly across the bezel edge from one screen to the other, preventing it from getting 'stuck' at an invisible boundary. Without this alignment, the mouse may jump to an unexpected location or fail to cross between displays smoothly.

Exam trap

The trap here is that candidates confuse display arrangement (spatial alignment) with resolution, scaling, or primary display settings, mistakenly thinking that matching resolutions or adjusting scaling is required for seamless cursor movement.

How to eliminate wrong answers

Option A is wrong because forcing both monitors to the same resolution (e.g., 1080p on the 4K display) would degrade the 4K monitor's native resolution, defeating its purpose for a stock trader who needs high-density detail. Option B is wrong because adjusting scaling on the 4K monitor (e.g., 150% or 200%) changes the size of UI elements but does not affect the cursor's ability to move between displays; scaling is unrelated to display arrangement. Option D is wrong because setting the 4K monitor as the primary display only determines where the taskbar and default windows appear, not the spatial relationship that enables seamless cursor movement.

Full explanation →

222

MCQeasy

A customer reports that their new Gigabit Ethernet connection is only achieving 100 Mbps speeds. The cable run is 75 meters through a drop ceiling and uses a Cat5e cable. What is the most likely cause of the speed limitation?

A.The cable is too long for Cat5e.

B.The cable is actually Cat5, not Cat5e.

C.The cable is shielded and causing interference.

D.The network switch port is faulty.

AnswerB

Standard Category 5 (Cat5) Ethernet cable is only certified to support network speeds up to 100 Mbps (100BASE-TX) due to its less stringent specifications for crosstalk and impedance. In contrast, Category 5e (Cat5e) cable introduces enhanced specifications, particularly for crosstalk performance, enabling it to reliably support Gigabit Ethernet (1000BASE-T) up to 1000 Mbps. If a Cat5 cable is mistakenly used where Cat5e is required for a gigabit connection, the link will negotiate down to its maximum supported speed of 100 Mbps, directly explaining the customer's reported speed limitation.

Why this answer

Cat5e is rated for Gigabit Ethernet (1000BASE-T) up to 100 meters. However, if the cable is actually Cat5 (not Cat5e), it is only certified for 100 Mbps (100BASE-TX) at that distance. The 75-meter run is within spec for Cat5e, so the most likely cause is that the installed cable is Cat5, which cannot reliably support 1000BASE-T.

Exam trap

CompTIA A+ often tests the misconception that cable length is the primary limiting factor for Gigabit Ethernet, when in fact Cat5e supports up to 100 meters, and the real issue is often the cable category or a fallback negotiation.

How to eliminate wrong answers

Option A is wrong because Cat5e supports Gigabit Ethernet up to 100 meters, and 75 meters is well within that limit. Option C is wrong because shielded cable (STP) does not inherently cause interference; in fact, it reduces electromagnetic interference, and proper termination would not limit speed to 100 Mbps. Option D is wrong because a faulty switch port would typically cause link drops, errors, or no link at all, rather than a consistent 100 Mbps speed cap.

Full explanation →

223

MCQmedium

A technician is troubleshooting a user's laptop that cannot obtain an IP address via DHCP. The laptop shows an Automatic Private IP Addressing (APIPA) address of 169.254.x.x. Other devices on the same network obtain IPs correctly. Which protocol should the technician verify is functioning on the laptop?

A.DNS

B.ARP

C.DHCP

D.ICMP

AnswerC

DHCP (Dynamic Host Configuration Protocol) is the standard network protocol used to automatically assign IP addresses and other crucial network configuration parameters, such as subnet masks, default gateways, and DNS server addresses, to devices on a network. If a DHCP server is unavailable or unresponsive, a client device will fail to obtain a valid IP address from the network. This often results in the device self-assigning an Automatic Private IP Addressing (APIPA) address, which prevents communication with other devices outside its immediate link-local segment.

Why this answer

The laptop has an APIPA address (169.254.x.x), which is assigned when a DHCP client fails to receive a DHCPOFFER from any DHCP server. Since other devices on the same network obtain IPs correctly, the DHCP server and network infrastructure are functional, so the issue is isolated to the laptop's DHCP client service or its ability to send and receive DHCP messages (UDP ports 67/68). The technician must verify that the DHCP protocol is functioning correctly on the laptop, including checking that the DHCP client service is running and that no firewall is blocking DHCP traffic.

Exam trap

A common misconception is that an APIPA address indicates a network-wide DHCP server failure. However, since other devices obtain IPs correctly, the issue is client-side. The technician must verify that the DHCP protocol is functioning on the laptop, not DNS, ARP, or ICMP.

How to eliminate wrong answers

Option A (DNS) is wrong because DNS resolves domain names to IP addresses and is not involved in the initial IP address assignment process; a device must have an IP address before it can use DNS. Option B (ARP) is wrong because ARP resolves IP addresses to MAC addresses on a local network and is used after an IP address is obtained, not for obtaining an IP address via DHCP. Option D (ICMP) is wrong because ICMP is used for network diagnostics (e.g., ping) and error reporting, not for dynamic IP address assignment.

Full explanation →

224

MCQmedium

A customer reports that their new Gigabit Ethernet connection is only achieving 100 Mbps speeds. The cable run is about 75 meters through a drop ceiling. The technician checks the patch panel and wall jack terminations, which appear correct. What is the most likely cause of the speed issue?

A.The cable run exceeds the maximum length for Gigabit Ethernet.

B.The cable is Cat5 or lower, which cannot support Gigabit Ethernet at that distance.

C.The wall jack is wired for T568B but the patch panel uses T568A.

D.The cable is shielded (STP) and the connectors are unshielded (UTP).

AnswerD

Shielded Twisted Pair (STP) cables rely on their metallic shield to protect against electromagnetic interference (EMI) and radio frequency interference (RFI). For this shield to be effective, it must be properly grounded, typically through shielded connectors. Using unshielded (UTP) connectors with an STP cable prevents the shield from being correctly terminated and grounded, rendering it ineffective. This increased susceptibility to noise can degrade signal quality, forcing the network interface card (NIC) to negotiate down to a more robust, slower speed like 100 Mbps.

Why this answer

The most likely cause is that the cable is shielded (STP) but the connectors are unshielded (UTP). When STP cable is used with UTP connectors, the shielding is not properly grounded, leading to signal interference and degradation. This often results in the link falling back to 100 Mbps.

The 75-meter run is within the 100-meter limit for Gigabit, and terminations appear correct, so the shield mismatch is the primary suspect.

Exam trap

Do not assume that a speed downgrade is always due to cable category; shielding mismatches and faulty pairs are common causes.

Full explanation →

225

MCQhard

A technician is troubleshooting a PC that randomly freezes during boot. The technician notices that the motherboard has a 24-pin ATX power connector and an 8-pin EPS12V connector. The power supply only has a 4+4 pin CPU power cable. What should the technician do?

A.Connect only the 4-pin portion of the cable to the 8-pin header

B.Combine the two 4-pin halves to form an 8-pin connector and attach it

C.Use a 6-pin PCIe power cable in the 8-pin CPU header

D.Leave the 8-pin header unconnected and rely on the 24-pin connector

AnswerB

Many power supply units (PSUs) provide the EPS12V CPU power cable as two separate 4-pin connectors, often labeled P4 or CPU. These 4+4 pin halves are specifically designed with interlocking mechanisms to be combined into a single 8-pin connector. Attaching this fully assembled 8-pin connector to the motherboard's 8-pin EPS12V header ensures the CPU receives the complete and stable 12-volt power supply necessary for its proper operation, preventing instability or performance issues.

Why this answer

The 4+4 pin CPU power cable is deliberately split so its two halves can be joined into a single 8-pin EPS12V connector for motherboards that require the full 8-pin CPU power. Combining the halves and attaching them to the 8-pin header delivers the required +12V rails and ground pins in the correct keyed orientation, resolving the boot instability caused by insufficient CPU power.

Exam trap

220-1201 often tests the confusion between PCIe (6/8-pin) and EPS12V (4+4/8-pin) CPU power connectors, so candidates who grab the wrong cable or leave a header empty pick a wrong answer.

How to eliminate wrong answers

Option A is wrong because plugging only the 4-pin half into one side of an 8-pin header leaves half the CPU VRM power pins unpowered, which can cause random freezes, failed POST, or throttling under load. Option C is wrong because a 6-pin PCIe cable uses a different pinout and keying than EPS12V; forcing it can short 12V rails and damage the board or PSU. Option D is wrong because the 24-pin ATX connector supplies the motherboard and chipset, not the dedicated CPU VRM rails; leaving the 8-pin EPS12V unconnected starves the CPU of power.

Full explanation →

CompTIA A+ Core 1 220-1201 (220-1201) — Questions 151–225