1020 questions total · 14pages · All types, answers revealed
If the VM has a static IP outside the NAT range (e.g., 192.168.137.x), it cannot reach the gateway, causing internet failure.
A user complains that their laptop frequently disconnects from the Wi-Fi when they move to a different room, but other devices in that room work fine. The technician checks the laptop's wireless adapter settings. Which configuration is most likely causing the issue?
Power saving can cause the adapter to drop the connection to conserve battery, especially when signal fluctuates, leading to disconnections.
Why this answer
Power saving mode on the wireless adapter reduces power consumption by periodically turning off the radio, which can cause intermittent disconnections when the laptop moves between rooms and the signal strength fluctuates. This is a common issue because the adapter may not maintain a stable connection as it transitions between access points or renegotiates power-saving states.
Exam trap
Candidates may mistakenly attribute the issue to signal range or channel interference (options B or D), but the key clue is that other devices work fine in the same room, pointing to a laptop-specific configuration like power saving mode.
How to eliminate wrong answers
Option A is wrong because a hidden SSID does not cause disconnections when moving rooms; it only prevents the network name from being broadcast, requiring manual entry to connect. Option B is wrong because 802.11a operates on the 5 GHz band, which has shorter range and poorer wall penetration than 2.4 GHz, but the issue is disconnections in other rooms where other devices work fine, indicating the problem is adapter-specific, not band-related. Option D is wrong because a 40 MHz channel width can cause interference or compatibility issues, but it would affect all devices on the same network, not just the laptop, and would not cause disconnections only when moving rooms.
A company is upgrading its network to support 10 Gbps speeds for a server farm. The existing cabling is Cat6a, and the switches are Gigabit. The IT manager wants to minimize cost while achieving 10 Gbps. Which hardware change is required?
Correct. Cat6a supports 10 Gbps, so only the switches need to be upgraded to 10 Gbps models. This is the most cost-effective solution.
Why this answer
Cat6a cabling is rated to support 10 Gbps Ethernet up to 100 meters, so no cable replacement is needed. The bottleneck is the existing Gigabit switches, which must be upgraded to 10 Gbps switches to achieve the desired speed. This is the most cost-effective approach because it avoids the expense of new cabling.
Exam trap
Students often think a higher category cable (e.g., Cat7) is needed for 10 Gbps, but Cat6a supports it. The real bottleneck is the switch hardware, not the cabling.
How to eliminate wrong answers
Option A is wrong because Cat6a already supports 10 Gbps at distances up to 100 meters, making an upgrade to Cat7 unnecessary and more expensive. Option C is wrong because replacing switches with Gigabit models (even with SFP+ ports) would still limit the network to 1 Gbps unless fiber SFPs and transceivers are used, and the question specifies minimizing cost while achieving 10 Gbps over existing copper cabling. Option D is wrong because repeaters are not used for signal boosting in Ethernet networks; they would introduce latency and are not a standard solution for 10 Gbps over Cat6a, which already meets the required signal integrity.
A user configures their laptop to use a static IP address, subnet mask, and default gateway. They can ping other devices on the same subnet but cannot reach the internet. What network service is most likely missing from their configuration?
Without a DNS server address, the laptop cannot resolve domain names, making internet access fail even with correct IP settings.
Why this answer
A static IP configuration includes the IP address, subnet mask, and default gateway, but if the DNS server address is not manually set, the laptop cannot resolve domain names to IP addresses. Since the user can ping devices on the same subnet (local connectivity works) but cannot reach the internet, the missing DNS server prevents name resolution for external hosts, even though routing via the default gateway is functional.
How to eliminate wrong answers
Option A is wrong because a DHCP server is not required for static IP configurations; the user manually set the IP, subnet mask, and gateway, so DHCP is irrelevant. Option C is wrong because NAT is a router function that translates private IPs to public IPs; it is not configured on the client laptop and is not a service the user would set in their TCP/IP settings. Option D is wrong because a proxy server is an intermediary for HTTP/HTTPS traffic, not a fundamental requirement for basic internet connectivity; the issue is name resolution, not proxy configuration.
A technician is tasked with enabling virtualization on a desktop to run a hypervisor. After enabling the feature in the OS, the hypervisor still reports that virtualization is disabled. What should be checked in the firmware?
These CPU features must be enabled in firmware for the hypervisor to access hardware virtualization.
Why this answer
Virtualization support must be enabled in the CPU's firmware settings (e.g., Intel VT-x or AMD-V) before the OS can use it. The OS setting alone is insufficient. This question tests knowledge of firmware-level CPU features.
A user reports that their smartphone's screen is flickering and has vertical lines. The phone has not been dropped or exposed to water. Which of the following is the most likely cause of this issue?
A loose or damaged display cable can cause intermittent or permanent display artifacts like flickering and vertical lines.
Why this answer
Screen flickering and vertical lines are classic symptoms of a failing display or a loose internal display cable. Since there was no physical trauma, a loose connection or a manufacturing defect in the display assembly is the most probable cause.
A user's laser printer is producing pages with a gray background (toner dust) on the entire page. The toner cartridge is genuine and was recently replaced. The printer has printed several hundred pages since the change. What is the most likely cause?
A worn drum cannot hold a uniform charge, causing toner to be attracted to non-image areas, resulting in a gray background.
Why this answer
A gray background or toner dust on laser prints is often caused by a faulty or worn imaging drum that cannot hold a proper charge, leading to toner being deposited where it shouldn't. It can also be due to a high-voltage power supply issue, but the drum is the more common replaceable component. The toner cartridge being genuine rules out compatibility issues.
A small office with 15 employees uses a single switch to connect all workstations. Users report that the network becomes extremely slow during peak hours, and some packets are being dropped. The switch is a 10/100 model with a 1 Gbps uplink to the router. What is the most likely cause of the slowdown?
Correct. 10/100 switches limit each port to 100 Mbps, which can be saturated by multiple users, leading to packet loss and slowdowns.
Why this answer
The switch operates at 10/100 Mbps per port, meaning each workstation is limited to a maximum of 100 Mbps. With 15 employees active during peak hours, the aggregate traffic can easily exceed the 100 Mbps per-port capacity, causing congestion, packet drops, and slowdowns. The 1 Gbps uplink to the router is not the bottleneck; the bottleneck is the 100 Mbps access ports connecting the workstations.
Exam trap
Cisco often tests the misconception that a slow network during peak hours is always due to a lack of QoS or a faulty uplink, rather than the simple bandwidth limitation of 100 Mbps ports being saturated by multiple users.
How to eliminate wrong answers
Option A is wrong because while a managed switch can prioritize traffic (e.g., using QoS), the core issue here is insufficient bandwidth per port, not a lack of traffic prioritization; even with QoS, the 100 Mbps port speed would still be saturated. Option C is wrong because the router's uplink port is 1 Gbps, which is more than sufficient for 15 users, and there is no evidence of a faulty port (e.g., CRC errors, link flapping). Option D is wrong because the device is explicitly described as a switch, not a hub; switches create separate collision domains per port, eliminating collisions, whereas hubs share a single collision domain.
A network engineer is designing a subnet scheme for a company with three departments: Sales (50 devices), HR (20 devices), and IT (10 devices). The company uses the 10.0.0.0/24 network. To minimize waste, the engineer decides to use variable-length subnet masking (VLSM). Which of the following subnet masks should be assigned to the Sales department?
Correct. A /26 provides 62 usable addresses, enough for 50 devices with minimal waste.
Why this answer
The Sales department requires 50 hosts. A /26 subnet mask (255.255.255.192) provides 62 usable addresses (2^(32-26)-2 = 62), which is the smallest subnet that can accommodate 50 devices without waste. VLSM allows using this mask within the 10.0.0.0/24 network, leaving room for other subnets.
Exam trap
Cisco often tests the candidate's ability to calculate the exact number of usable hosts per subnet (2^(32-prefix)-2) and match it to the requirement, tricking those who forget to subtract the network and broadcast addresses or who round up to the nearest power of two without considering the -2.
How to eliminate wrong answers
Option A (255.255.255.128) is wrong because it provides 126 usable addresses, which is far more than the 50 needed, resulting in significant waste and violating the VLSM goal of minimizing waste. Option C (255.255.255.224) is wrong because it provides only 30 usable addresses (2^5-2 = 30), which is insufficient for 50 devices. Option D (255.255.255.240) is wrong because it provides only 14 usable addresses (2^4-2 = 14), far too few for the Sales department.
A company is setting up a new branch office with 30 employees. They need to connect all workstations to the network and provide internet access. The internet connection is a fiber optic line terminating in an ONT. Which device should be placed between the ONT and the switch to route traffic and provide NAT?
A router connects the ONT to the switch, performs NAT, and routes traffic between the local network and the internet.
Why this answer
The ONT converts fiber to Ethernet, but it does not route or perform NAT. A router is required to connect the local network to the internet, provide NAT, and handle IP addressing. A switch alone cannot route, and a firewall is often combined with a router but is not the primary device for routing.
The correct answer is a router.
A user reports that their new Bluetooth headset pairs with their smartphone but no audio is heard during calls. The headset works fine with another phone. What is the most likely cause?
Smartphones can use separate profiles for media (A2DP) and calls (HSP/HFP); if the call profile is not active, no audio is heard.
Why this answer
The most likely cause is that the phone is not using the correct Bluetooth profile for calls. Bluetooth headsets require the Hands-Free Profile (HFP) or Headset Profile (HSP) for bidirectional audio during calls. If the phone defaults to the Advanced Audio Distribution Profile (A2DP) for media streaming instead, audio will not route through the headset for calls.
Since the headset works with another phone, the issue is specific to the phone's profile selection or configuration.
Exam trap
The 220-1201 exam often tests the distinction between Bluetooth profiles (HFP/HSP vs. A2DP) to trap candidates who assume that successful pairing guarantees all audio functions will work.
How to eliminate wrong answers
Option A is wrong because a low battery would typically cause intermittent audio, pairing failures, or no power at all, not a scenario where the headset pairs successfully but produces no audio during calls. Option C is wrong because Bluetooth range is approximately 10 meters (33 feet) for Class 2 devices; if the headset is paired and within range, range would not cause a complete lack of audio only during calls while media works. Option D is wrong because a faulty Bluetooth radio would likely cause pairing failures, frequent disconnections, or no audio across all functions, not a selective issue where the headset pairs and works for media but fails only during calls.
During a site survey, a technician needs to measure the signal strength of a wireless access point from various locations in an office to ensure adequate coverage. Which tool should be used for this task?
A Wi-Fi analyzer shows signal strength, channel usage, and interference, making it ideal for wireless site surveys.
Why this answer
A Wi-Fi analyzer is the correct tool because it is specifically designed to measure wireless signal strength (RSSI), channel utilization, and interference from access points. During a site survey, the technician uses a Wi-Fi analyzer to collect real-time signal data from various locations, ensuring adequate coverage and identifying dead zones or co-channel interference.
Exam trap
In CompTIA A+ exams, candidates often confuse Wi-Fi analyzers with spectrum analyzers. A Wi-Fi analyzer measures signal strength from access points for coverage surveys, while a spectrum analyzer detects RF interference and noise.
How to eliminate wrong answers
Option A is wrong because a multimeter measures electrical properties like voltage, current, and resistance, not wireless RF signal strength. Option C is wrong because a spectrum analyzer measures RF energy across a frequency spectrum to detect interference sources, but it does not decode Wi-Fi frames or provide per-AP signal strength readings needed for a coverage survey. Option D is wrong because a cable tester verifies the physical integrity and wiring of Ethernet cables (e.g., continuity, shorts, or opens), not wireless signal propagation.
A technician is setting up a dual-monitor workstation. One monitor is connected via DisplayPort, the other via DVI. The DVI monitor is not detected. The DisplayPort monitor works fine. Which of the following is the most likely cause?
A loose cable or unpowered monitor is the most common reason for a display not being detected.
Why this answer
Many graphics cards require that the DisplayPort monitor be the primary display or that the DVI port is disabled when a DisplayPort is active in certain configurations. However, the most common issue is that the DVI cable is not fully seated or the monitor is not powered on. The correct answer focuses on checking the DVI connection and power, as these are simple to verify.
A user wants to use a wired headset with their tablet for voice calls, but the tablet only has a single USB-C port and no 3.5mm jack. The headset has a 3.5mm plug. Which accessory should you recommend?
This adapter plugs into the tablet's USB-C port and provides a 3.5mm jack for the headset, enabling wired audio.
Why this answer
Option C is correct because a USB-C to 3.5mm adapter converts the digital audio signal from the USB-C port into an analog signal that the wired headset can use. This adapter typically includes a built-in DAC (Digital-to-Analog Converter) to handle the conversion, enabling voice calls through the tablet's USB-C port without requiring additional power or Bluetooth pairing.
Exam trap
CompTIA A+ often tests the misconception that a USB-C hub (Option A) is a universal solution for all port shortages, but candidates must recognize that audio output requires a specific adapter with a DAC, not just any hub.
How to eliminate wrong answers
Option A is wrong because a USB-C hub with multiple ports provides additional connectivity (e.g., HDMI, USB-A, Ethernet) but does not inherently include a 3.5mm audio jack; unless the hub specifically has an audio output, it will not solve the headset connection issue. Option B is wrong because a Bluetooth audio adapter would convert the wired headset into a wireless device, which is unnecessary and introduces latency, pairing steps, and battery dependency when a simple wired adapter is sufficient. Option D is wrong because a 3.5mm Y-splitter cable is designed to split a single 3.5mm jack into two (e.g., for separate microphone and headphone plugs) but does not convert USB-C to 3.5mm; the tablet lacks a 3.5mm port entirely, so the splitter has no source to connect to.
A user wants to access their company's webmail using a secure connection from a public Wi-Fi hotspot. The webmail server is configured to use IMAP over SSL. Which port should the email client use?
Port 993 is IMAPS, the secure version of IMAP using SSL/TLS.
Why this answer
IMAP over SSL (IMAPS) uses TCP port 993 to establish an encrypted connection. Since the user is on a public Wi-Fi hotspot and the server is configured for IMAP over SSL, the email client must connect to port 993 to ensure all traffic is encrypted via TLS/SSL. Port 143 is the default for unencrypted IMAP, which would expose credentials and email data on an insecure network.
Exam trap
The CompTIA A+ exam often tests the distinction between default ports for encrypted vs. unencrypted protocols, and the trap here is that candidates confuse port 993 (IMAP over SSL) with port 995 (POP3 over SSL) or assume port 143 can be used with SSL without realizing it requires STARTTLS rather than implicit TLS.
How to eliminate wrong answers
Option A is wrong because port 143 is the default port for unencrypted IMAP, not IMAP over SSL; using it would send data in plaintext, which is insecure on a public Wi-Fi hotspot. Option B is wrong because port 110 is the default port for POP3 (unencrypted), not IMAP; POP3 is a different protocol for retrieving email, and it lacks encryption on this port. Option D is wrong because port 995 is the default port for POP3 over SSL (POP3S), not IMAP over SSL; it is used for encrypted POP3 connections, not IMAP.
A user reports intermittent network connectivity in an office that recently had a new ceiling installed. The network drop runs through the ceiling and is not in a conduit. What is the most likely cause of the intermittent connection?
New construction can pinch cables, causing intermittent breaks or shorts. This is a common issue after ceiling work.
Why this answer
The new ceiling installation is the most likely cause because the network cable, running without conduit, can easily be pinched or kinked by ceiling tiles, support wires, or other hardware. Physical damage like a pinch or kink can cause impedance mismatches, signal reflection, or even a short, leading to intermittent connectivity. This is a classic physical-layer issue where the cable's integrity is compromised by environmental changes.
Exam trap
CompTIA A+ emphasizes the importance of physical layer issues. The new ceiling installation can easily pinch or kink the cable, causing impedance mismatches and intermittent connectivity. Candidates may overlook environmental changes and instead incorrectly blame termination or switch hardware.
How to eliminate wrong answers
Option A is wrong because cable length limits (e.g., 100 meters for Ethernet over twisted pair) are a constant factor; if the cable were too long, the issue would be persistent, not intermittent, and the recent ceiling work would not affect length. Option B is wrong because improper termination at the patch panel typically causes a permanent fault (e.g., no link or continuous errors), not intermittent connectivity that coincides with the ceiling installation. Option D is wrong because a faulty switch port usually causes consistent failure or errors on that specific port, and the timing with the ceiling work makes a physical cable issue far more probable than a coincidental hardware failure.
A technician is troubleshooting a laptop that powers on but displays a black screen with no boot activity. The technician hears the fan spinning and sees the power LED is on. Which of the following steps should the technician perform next to isolate the issue?
Connecting an external monitor tests whether the laptop is outputting video; if it works, the internal display or cable is the problem.
Why this answer
A black screen with power but no boot suggests a hardware issue, often with the display or memory. Connecting an external monitor can quickly determine if the problem is with the laptop's LCD panel or the video output. If the external monitor works, the internal display or its cable is likely faulty.
A user reports that their laser printer is producing pages with vertical black streaks. The streaks appear consistently in the same location on every page. Which printer component is most likely causing this issue?
A scratched or damaged drum will cause the same defect to repeat on every page, resulting in vertical streaks.
Why this answer
Vertical black streaks on a laser printer page are typically caused by a scratched or damaged drum. The drum transfers toner to the paper, and any defect will repeat with each rotation. Cleaning or replacing the drum assembly usually resolves this issue.
A technician is troubleshooting a VM that frequently crashes with a 'blue screen' error. The host is a Type 1 hypervisor running on server-grade hardware with ECC RAM. The VM was created from a template and has been stable for months. Recently, the technician added a second virtual CPU to the VM. What is the most likely cause of the crashes?
If the guest OS or its drivers are not SMP-aware, adding a second vCPU can lead to kernel panics or blue screens due to race conditions.
Why this answer
Adding a second virtual CPU can expose timing and synchronization issues in the guest OS, especially if the application or OS is not optimized for multi-core. This is a known cause of instability in virtualized environments.
A technician is configuring an MFP for a healthcare clinic that must comply with HIPAA. The MFP has a built-in hard drive that stores scanned documents. The clinic wants to ensure that once a document is scanned and transmitted, it cannot be recovered from the MFP's drive. What feature should the technician enable?
Secure erase overwrites the hard drive sectors after the scan is sent, ensuring the data cannot be recovered, meeting HIPAA requirements.
Why this answer
Secure erase (or data overwrite) is a feature that overwrites the hard drive with patterns of data to prevent recovery. This is critical for compliance in environments like healthcare where patient data must be protected after use.
A user reports that their computer's hard drive makes a clicking noise and the system occasionally freezes. Which action should you take first?
The clicking noise suggests imminent drive failure; backing up data is the critical first step.
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.
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?
POST code '00' is a common indicator of a CPU initialization failure, pointing to a faulty or improperly installed CPU.
Why this answer
POST code '00' typically indicates a CPU-related issue, such as a faulty CPU, incorrect installation, or bent pins. Since the fan spins, power is reaching the board, but the CPU is not initializing. The technician should reseat the CPU and check for damage.
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 fluid dynamic bearing is more durable in dusty conditions, and a dust filter prevents particulate buildup inside the PSU, which can cause overheating and fan failure.
Why this answer
In dusty environments with limited airflow, a PSU with a high-quality, sealed bearing fan (e.g., fluid dynamic bearing) and a dust-resistant design (e.g., honeycomb grill, dust filters) is critical. Additionally, a higher efficiency rating (e.g., 80 Plus Gold or better) reduces heat output, easing thermal stress. The most important single feature is the fan's reliability and the PSU's ability to handle particulate ingress.
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 vertical line of dead pixels is a panel defect; warranty replacement is the standard solution.
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.
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?
Satellite internet works anywhere with a clear view of the sky, making it ideal for remote locations without wired infrastructure.
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.
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 VLAN separates traffic at Layer 2, ensuring guest devices cannot reach the corporate network even though they share the same access point.
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.
A technician is troubleshooting a PC that powers on but does not display anything on the monitor. The fans spin, and the keyboard lights flash briefly. The power supply fan is spinning. What is the most efficient next step to isolate the issue?
Measuring voltages on the 24-pin and 4/8-pin CPU connectors can confirm if the PSU is delivering proper power, ruling out a common cause.
Why this answer
Testing the power supply with a multimeter or PSU tester is efficient because it quickly verifies if all rails are within spec. A failing PSU can cause no-post issues even if the fan spins. Other components like RAM or GPU could also be at fault, but checking power first avoids wasted effort.
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?
Clogged printhead nozzles block ink flow, resulting in blank pages despite full cartridges.
Why this answer
When an inkjet printer prints blank pages despite full cartridges, the printhead nozzles are often clogged. Ink can dry and block the tiny nozzles, preventing ink from reaching the paper. Running the printer's cleaning cycle or manually cleaning the printhead usually resolves the issue.
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?
STP cables include shielding that protects against EMI, making them ideal for environments with high interference.
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.
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?
SFX PSUs are smaller and designed for compact builds, fitting mini-ITX cases while still providing sufficient power.
Why this answer
SFX (Small Form Factor) power supplies are designed for compact cases and mini-ITX builds, offering smaller dimensions while still providing adequate wattage. ATX PSUs are too large for many small cases. TFX is for slim cases, and EPS is for servers.
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?
This is the standard first step to clear dried ink from the nozzles.
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.
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?
Malware or a faulty driver can run hidden processes that max out the CPU, causing constant high usage.
Why this answer
Constant 100% CPU usage at idle suggests a background process is consuming resources, often due to malware or a misbehaving driver. This tests the ability to distinguish between hardware and software issues.
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?
Port 631 is the default port for IPP, used for network printing.
Why this answer
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.
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?
Correct. A link light with no activity often indicates a DHCP issue or static IP misconfiguration. Checking IP settings is the next logical step.
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.
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 memory leak causes a program to consume more and more RAM over time, eventually exhausting available memory and triggering low memory warnings.
Why this answer
A memory leak occurs when an application does not release memory after it is done using it, causing RAM usage to steadily increase. This is a common software issue that can be identified by checking which process is consuming memory in Task Manager.
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?
This address is within the subnet (1-254) but outside the DHCP pool (100-200), making it a safe static assignment.
Why this answer
Option B (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.
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?
The ONT converts fiber optic signals to Ethernet, which then connects to a router.
Why this answer
Option C is correct because 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.
A user in a law office reports that their laser printer prints documents with faint text and light images. The toner cartridge is new, and the printer has sufficient toner. Which component should you inspect or replace first?
The drum is responsible for attracting toner and transferring it to paper. A worn drum loses its charge, resulting in faint prints.
Why this answer
Faint print with a new toner cartridge often points to a worn or damaged drum. The drum is part of the toner cartridge or a separate unit, and if it is worn, it cannot hold a proper charge, resulting in light output. Replacing the drum or the entire cartridge usually solves the problem.
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?
Encryption protects data from being read if intercepted during transfer or if storage is compromised, which is essential for sensitive data.
Why this answer
When moving sensitive data to the cloud, encryption at rest and in transit is critical to protect against unauthorized access. While access controls and compliance are important, encryption is a fundamental requirement. The shared responsibility model means the provider secures the infrastructure, but the customer must secure the data.
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 black screen with vibration indicates the device boots but the display subsystem is not working, often due to a failed LCD or loose cable.
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.
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 damaged cable can cause the port to operate at USB 2.0 speeds due to signal integrity issues.
Why this answer
A damaged or poorly connected front panel USB cable can cause the port to fall back to USB 2.0 speeds. The motherboard header is correct, so the issue is likely with the cable or connection. This tests advanced troubleshooting of USB 3.0 connectivity.
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?
Without DisplayPort Alt Mode, the cable cannot transmit the high bandwidth needed for 4K video, limiting resolution.
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.
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?
This is correct; a loose port can cause intermittent signal loss, leading to flickering.
Why this answer
The correct answer is B because 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.
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 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
This question tests understanding of NVMe versus SATA performance. For video editing, extremely fast sequential read/write speeds are critical. An M.2 NVMe PCIe 4.0 drive offers speeds up to 7,000 MB/s, far exceeding SATA SSDs (about 550 MB/s).
The correct answer is to use the M.2 slot for a single fast drive.
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?
This resets the Bluetooth radio and stack, often fixing wake-from-sleep issues without affecting other 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.
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?
Updating the driver can fix bugs or compatibility issues that cause slow speeds and disconnections.
Why this answer
An outdated or corrupted Wi-Fi driver is a common cause of connectivity issues on older laptops. Updating the driver is a software-level fix that is quick and non-invasive, and it often resolves intermittent connectivity problems.
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?
This is correct; such readers are designed for mobile POS systems.
Why this answer
The correct answer is C because 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.
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?
Initializing the disk writes a partition table (GPT or MBR), making it recognizable to Windows and allowing further partitioning and formatting.
Why this answer
This scenario tests initial steps for adding a new storage device. The drive must be initialized and partitioned before it can be used. The correct first step is to initialize the disk using a partition style like GPT or MBR.
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?
Malware or a stuck update can peg the CPU at 100% usage, causing high temperatures and constant 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.
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 failing PSU can cause random restarts during boot due to unstable power delivery.
Why this answer
Random restarts during early boot, especially before the OS loads, often point to a failing power supply. The PSU may not be providing stable voltages under the initial power draw of the system. Using a multimeter to test voltage outputs or swapping with a known-good PSU is the next step.
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?
Low TDP CPUs produce less heat, enabling passive or low-speed fan cooling for quiet operation.
Why this answer
In SFF builds, heat dissipation is limited, so a CPU with low TDP generates less heat, allowing for smaller, quieter cooling solutions. This tests understanding of how TDP impacts system design and noise levels.
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?
An incorrect APN can still allow data but may route through a slower gateway or have restrictions, resulting in poor performance.
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.
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?
This removes corrupted cache and cookies that often cause app crashes, and is a standard troubleshooting step for browser issues.
Why this answer
Option C is correct because 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.
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?
The battery powers the CMOS memory that stores settings; when low, settings are lost.
Why this answer
A CMOS checksum error indicates that the BIOS/UEFI settings are not being retained, often due to a failing or dead CMOS battery. This causes time/date resets and boot delays as the firmware re-detects hardware. This tests knowledge of common CMOS-related symptoms.
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?
Port 5060 is the default port for SIP traffic.
Why this answer
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.
A technician is tasked with upgrading the RAM in a laptop that uses SO-DIMM modules. The laptop currently has 4 GB of RAM soldered on the motherboard and one empty SO-DIMM slot. The technician installs an 8 GB SO-DIMM, but the system only reports 8 GB total. What is the most likely reason?
Many laptops with soldered RAM automatically disable the onboard memory when a SO-DIMM is installed to avoid compatibility issues, resulting in only the SO-DIMM's capacity being available.
Why this answer
Some laptops with soldered RAM have a limitation where the SO-DIMM slot cannot be used simultaneously with the onboard memory, or the system may disable the onboard RAM when a module is installed. This is a design constraint, not a hardware failure.
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?
If the power button is not connected to the correct pins, pressing it will not complete the circuit to start the PSU.
Why this answer
No power at all after a motherboard swap strongly suggests an electrical connection issue. The most common cause is that the front panel power switch header is not connected correctly to the motherboard, or the PSU is not properly connected to the motherboard.
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?
5 GHz is not affected by microwave interference, so moving the printer to that band will stop the disconnections.
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.
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?
SNMP is the standard protocol for collecting device statistics and status information from network devices.
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.
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.
A company uses a cloud-based virtual desktop infrastructure (VDI) solution. Users report that logging in takes 5 minutes during peak hours. The IT team notices that the cloud provider's resource utilization is at 95%. Which action would best resolve this issue?
Scaling out by adding more virtual desktops distributes the load across additional VMs, reducing resource contention and login times during peak hours.
Why this answer
When a cloud provider's resource utilization is at 95%, the underlying physical infrastructure is saturated. Scaling up (vertical scaling) increases the VM's resources but does not alleviate the host-level bottleneck; the provider may not allow further scaling. Scaling out (horizontal scaling) adds more virtual desktop instances, distributing the load across additional VMs and reducing login times.
Migrating providers is disruptive, and disabling auto-scaling worsens performance.
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?
This adapter uses the USB-C Alt Mode to transmit HDMI video and audio, making it compatible with the projector.
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.
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?
Minimum RSSI settings cause the AP to disconnect clients with weak signals, forcing them to associate with a stronger AP, enabling proper roaming.
Why this answer
Option D is correct because 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.
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 cable certifier can measure noise levels and signal quality, helping identify EMI from external sources like fluorescent lights.
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.
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 router or Layer 3 switch can route traffic between VLANs, enabling inter-VLAN communication.
Why this answer
VLANs segment a network into separate broadcast domains, and by default, they cannot communicate with each other. A Layer 3 device, such as a router or a Layer 3 switch, is required to route traffic between VLANs. A Layer 2 switch cannot perform routing.
The correct answer is a router or a Layer 3 switch.
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 PoE extender regenerates the signal and power, allowing the run to exceed 100 meters.
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.
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?
DDR4 memory requires physically different slots; installing DDR4 into a DDR3 board is impossible due to different notch positions and keying.
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.
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?
Expired tokens or session timeouts are common after OS updates; re-authenticating usually resolves the issue.
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.
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?
Port 8080 is a common alternative for HTTP traffic, often used by proxy servers or when port 80 is blocked.
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.
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?
This feature is designed specifically to suppress touchpad input when the keyboard is being used, preventing the exact symptom described. It is the quickest and most effective first 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.
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 sudden loss of link suggests a physical break. This could be from construction, rodents, or accidental damage.
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.
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?
Increasing RAM directly addresses the memory shortage, allowing the system to handle more applications simultaneously without swapping to disk, which drastically improves performance.
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.
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?
Port 25 is the default SMTP port for sending email; blocking it prevents outgoing mail.
Why this answer
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.
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?
Spot instances use spare capacity at a lower cost but can be reclaimed by the provider at any time.
Why this answer
This question tests knowledge of advanced cloud pricing models. A spot instance (or preemptible VM) uses unused cloud capacity at a steep discount but can be terminated when the provider needs the resources back. On-demand is full price, reserved is for long-term commitments, and dedicated hosts are for isolation, not cost savings with termination risk.
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 failing VRM can cause voltage spikes or incorrect readings, triggering overvoltage protection.
Why this answer
A 'CPU Overvoltage Error' typically indicates the motherboard's voltage regulation module (VRM) is failing or the BIOS is incorrectly applying voltage. Aging VRMs can become unstable, causing overvoltage protection to trigger. This is a motherboard hardware fault, not a CPU issue.
A user reports that their laser printer is producing pages with a faint, ghost-like image of the previous page printed on the back of the current page. The printer has been in use for three years and has never had its maintenance kit replaced. What is the most likely cause of this issue?
A worn fuser fails to heat toner sufficiently, leaving residual toner on the drum that transfers to the next page, causing ghosting.
Why this answer
This describes a ghosting issue where a previous image appears on the next page, often caused by a worn-out fuser that fails to fully bond toner to the paper. The fuser is part of the maintenance kit, which should be replaced periodically. Other components like the toner cartridge or drum would cause different symptoms.
Practice 220-1201 by domain
Target a specific domain to shore up weak areas.