CompTIA A+ Core 1 220-1201 (220-1201) — Questions 451–525

POST beep codes are used to indicate hardware errors. A series of long beeps typically points to a memory issue, not a CPU problem. The technician should reseat the RAM modules to resolve this.

Virtual machines benefit from many cores and threads because each VM can be assigned to a separate core. AMD AM5 CPUs offer high core counts, making them ideal for virtualization. This tests understanding of how CPU architecture affects specific tasks.

This is a common deployment issue where the device's wireless radio supports 2.4 GHz but not 5 GHz, or the 5 GHz channel is not supported. Older or budget tablets may lack 5 GHz capability, or the corporate network may use a 5 GHz channel (e.g., DFS channels) that the tablet's radio cannot use. Checking the tablet's Wi-Fi specifications is the correct first step.

This question tests basic printer configuration knowledge. Most multifunction printers have a control panel menu that displays network settings, including the IP address. Alternatively, printing a configuration page from the printer's menu will show the IP.

The workstation has a valid IP and can ping itself, indicating the NIC and stack are working. However, it cannot reach the gateway, which suggests a Layer 2 issue—likely an incorrect or missing default gateway configuration, or a VLAN mismatch on the switch port.

Since VGA is analog and HDMI is digital, an active converter is needed. A USB-C to VGA adapter can work if the laptop supports video over USB-C, but an HDMI to VGA adapter is also an option if the laptop has HDMI. The best answer is an HDMI to VGA active adapter, as it directly converts the digital signal to analog.

Horizontal white streaks on inkjet prints typically indicate clogged printhead nozzles. Since the cleaning cycle did not help, physically cleaning the printhead or replacing it is the next step. Replacing ink cartridges or adjusting paper settings would not address clogged nozzles.

Removing the bracket and screw allows the drive to be lifted or slid out of its connector. This is standard procedure for 2.5-inch drives in laptops. The technician must also disconnect any attached cables before removal.

This question tests understanding of shielded cabling and its application in high-EMI environments. STP (shielded twisted pair) reduces electromagnetic interference, making it suitable for runs near machinery. The correct answer emphasizes the shielding benefit.

If the system has integrated graphics and a discrete card, the UEFI may default to the integrated output. Changing the primary video adapter to PCIe/ PEG forces the system to use the new card. This tests understanding of video initialization order in UEFI.

This scenario tests knowledge of HTTPS, which is HTTP over TLS/SSL for encrypted communication. Using a certificate is a key part of setting up HTTPS.

This question tests understanding of Ethernet pinout and fault isolation. The correct answer is that the cable is likely damaged or broken on the pairs used for 1000Base-T (all four pairs), but 100Base-TX only uses pairs 1-2 and 3-6. The symptom indicates a break in the cable affecting the secondary pairs.

Live migration (vMotion in VMware, live migration in Hyper-V) allows moving running VMs between hosts with zero downtime. This is a key feature for high availability and maintenance. The correct answer directly names this feature.

High resolutions require significant bandwidth over DisplayPort. If the cable is not rated for the required version (e.g., DP 1.2 for 1440p at high refresh rates), it can cause signal loss. The intermittent black screen is a classic symptom of a cable that cannot handle the data rate.

Warping and poor adhesion in FDM printing are often caused by an incorrect first layer height or bed leveling. If the nozzle is too far from the bed, the filament does not squish enough to stick. Adjusting the bed leveling or Z-offset ensures proper first layer adhesion.

An uninterruptible power supply (UPS) provides battery backup and voltage regulation, protecting against surges, sags, and brownouts that can cause reboots or failures. A surge protector only guards against spikes, not low-voltage conditions. A UPS is the appropriate solution for unstable power.

Coffee can seep into the touchpad connector or the touchpad itself, causing a short or corrosion. The keyboard working suggests the liquid did not reach the main board, but the touchpad is a separate component that is more exposed. The correct answer is liquid damage to the touchpad.

The correct first step after powering off and removing removable components is to carefully heat the edges of the screen to soften the adhesive that holds it in place. This prevents cracking the glass further or damaging the frame. Attempting to pry the screen off cold can cause additional damage.

Garbled output from one OS but not another typically indicates a driver or PPD issue. macOS uses PostScript Printer Description (PPD) files for laser printers, and an incorrect or missing PPD can cause communication errors. Installing the correct driver for macOS resolves the problem.

This scenario isolates a DNS issue within a VPN connection. If users can ping internal IPs but not resolve names, the VPN server's DNS configuration (likely using DHCP over VPN or DNS forwarding) is failing. The protocol involved is DNS, which the VPN should push to clients.

This question tests understanding of network topology and switch use. Connecting all devices to a single switch and then uplinking that switch to the router is the most efficient, as it keeps traffic local and uses the router only for internet access.

When a system has a dedicated GPU, the motherboard video ports are often disabled. The most common oversight is connecting the monitor to the wrong port. This scenario tests basic hardware installation knowledge.

Passive cooling relies on low heat output. TDP (Thermal Design Power) directly indicates the amount of heat a cooler must dissipate. A low TDP CPU is essential for fanless operation.

A multimeter can measure voltage on the Ethernet cable's power pairs. Since the switch is configured for PoE and the cable appears intact, measuring voltage at the phone end can confirm whether power is reaching the device.

This question tests understanding of wireless interference and signal propagation. Physical obstacles like metal studs or electronic interference can weaken signals. The conference room's environment is the key factor.

VLANs logically separate network traffic on the same switch, allowing different departments to be isolated. A trunk port carries multiple VLANs to the router, which can route between them and to the internet using a router-on-a-stick configuration.

RAID 5 can tolerate one drive failure without data loss because parity data is distributed across all drives. The array will continue to operate in a degraded state until the failed drive is replaced and rebuilt. A second failure would cause data loss.

For high-quality photo prints on glossy paper, the driver must be set to 'photo' or 'best' quality and the paper type to 'glossy' or 'photo paper'. This optimizes ink droplet size and drying time. The default 'normal' and 'plain paper' settings use less ink and different halftoning, causing washed-out, grainy results.

This question tests best practices for structured cabling, specifically labeling and documentation. Proper labeling at both ends of each cable run simplifies future troubleshooting and maintenance. The correct answer emphasizes this fundamental practice.

Thunderbolt 3 supports daisy-chaining via DisplayPort over USB-C. Each monitor must have a DisplayPort input and support MST (Multi-Stream Transport). The first monitor connects to the laptop via USB-C to DisplayPort cable, and the second connects to the first monitor's DisplayPort out.

This tests understanding of IP configuration. A static IP that is not in the same subnet as the router or has an incorrect default gateway will prevent internet access even though the Wi-Fi link is established.

High CPU usage by the 'System' process often indicates a driver or hardware issue, such as a failing battery or a misconfigured power plan. In tablets, a common cause is a driver that prevents the device from entering low-power sleep states, leading to constant CPU activity and battery drain.

A power outage can cause multiple drives to be marked as offline or failed due to incomplete writes, even if they are healthy. The array status 'Failed' with all drives detected suggests a metadata issue. The best first step is to check the controller's event log and attempt to import or rebuild the array without initializing it, which would destroy data.

This question tests knowledge of NAT. Network Address Translation (NAT) translates private IPs to public IPs and vice versa, enabling internal servers to be reachable from the internet. DNS resolves names, but NAT handles the IP translation.

Bluetooth interference from other devices or physical obstructions (like a rugged case) can cause signal degradation, leading to missed keystrokes. The scanner may use a different Bluetooth profile or be less sensitive to interference. The correct answer identifies interference as the likely cause.

This question differentiates between LCD and backlight failures. A dim, flickering display with normal touch and OS function points to a backlight issue, often caused by a failing LED driver or inverter. The LCD panel itself may be fine.

Cat5e cable is rated for 100 meters at 1 Gbps, so distance alone is not a problem. However, if the cable is damaged or poorly terminated, it can cause errors and speed reduction. The most common issue is a faulty cable or connection, not the distance itself.

This question tests advanced Android power management. The 'Keep Wi-Fi on during sleep' setting prevents the device from disconnecting from Wi-Fi when the screen turns off, which is critical for a POS system. The other options do not address the specific requirement.

Quad-channel memory architecture requires that all four memory channels be populated with identical modules to achieve maximum bandwidth. Installing one module per channel (e.g., in slots 1, 3, 5, 7 or the designated quad-channel slots) allows the memory controller to access all four channels simultaneously, quadrupling the data transfer rate compared to single-channel. Using fewer modules or mismatched sizes would reduce the channel count or cause the system to run in a lower-channel mode.

RAID 10 (1+0) mirrors and then stripes, so usable capacity is half of total raw capacity (4 x 500 GB = 2 TB raw, 1 TB usable). The technician likely expected RAID 5 capacity (75% usable) but configured RAID 10.

The external display working normally indicates the GPU and OS are functional. The black built-in display points to a failure in the LCD panel, backlight, or the display cable (e.g., LVDS/eDP ribbon cable) connecting the motherboard to the screen. A loose or damaged internal cable is a common cause, especially in laptops that have been moved frequently.

An APIPA address (169.254.x.x) indicates the PC failed to get a DHCP lease. Since the router has DHCP enabled, the issue is likely a bad Ethernet cable or a port problem preventing communication with the DHCP server.

This question tests understanding of VoIP passthrough ports. The PC's lack of connectivity is often due to a faulty or unseated Ethernet cable between the phone and PC. The phone itself is working, so the upstream connection is fine.

RAID 0 stripes data across drives with no parity. If the array metadata is corrupted or one drive fails, the entire array becomes inaccessible. Individual detection suggests the drives are physically okay, but the RAID configuration is lost.

For dual-channel operation, memory modules must be installed in the correct slots, typically alternating colors or labeled as A2 and B2 (or slots 2 and 4) on most modern motherboards. This ensures the memory controller can access both sticks simultaneously, increasing bandwidth. The user manual or motherboard labeling is the definitive guide, but the common practice is to use the second and fourth slots from the CPU.

When a device can connect via Ethernet but not Wi-Fi, the issue is usually with the wireless configuration or hardware, not the network itself. Incorrect wireless security settings, such as a mismatched encryption type or password, are a common cause of connection failure after the network is detected.

This scenario describes a DNS resolution failure—the device can reach IP addresses but not domain names. The `ipconfig /all` command on Windows displays the configured DNS servers, allowing verification. Tools like `ping` test connectivity, `nslookup` queries DNS, and `tracert` traces routes, but only `ipconfig /all` shows the DNS server addresses assigned to the interface.

Fax over VoIP is sensitive to jitter and latency. The ATA's settings for fax passthrough (T.38) must be enabled and properly configured. Without T.38, fax data may be corrupted by voice codecs.

A peer-to-peer (P2P) network is ideal for small groups (typically fewer than 10 devices) where each computer can act as both client and server. It requires no dedicated server hardware, making it cost-effective for file and printer sharing. This contrasts with client-server networks that need a central server.

DDR3L modules operate at 1.35V, while standard DDR3 operates at 1.5V. Many older motherboards do not support DDR3L, or they require specific BIOS settings to handle the lower voltage. The technician should verify motherboard compatibility before installation.

If the GPU is not detected, the most likely motherboard-related cause is that the PCIe slot is disabled in BIOS or the slot itself is faulty. Another possibility is that the slot is configured for a different device (e.g., an M.2 drive sharing lanes). Verifying BIOS settings is the first step.

Touch functionality often requires a specific driver or calibration. The display works, so the issue is likely driver-related, not hardware. Checking device manager for missing drivers is the logical first step.

The correct answer is C because VGA connectors have pins that can bend or become loose over time, causing intermittent signal loss. This tests knowledge that VGA is an analog connector susceptible to physical damage and signal degradation.

The router needs DHCP client mode to obtain a public IP from the ISP, and DHCP server mode to assign private IPs to internal devices. DNS and NAT are also needed but the question asks for the services that provide IP addresses. NAT is required to translate private IPs to the public IP for internet access.

The ability to access shares by IP address but not by hostname indicates a name resolution problem. Since DNS works for other domains, the issue is likely with NetBIOS name resolution, which is used in Windows networks to resolve computer names to IP addresses. NetBIOS over TCP/IP (NBT) or LLMNR could be failing, but NetBIOS is the traditional protocol for this in local networks.

Overclocking increases the CPU's clock speed beyond stock settings, which generates more heat. A robust cooling solution is essential to maintain stability and prevent thermal throttling or damage. Other features like core count or cache are secondary for overclocking.

A 6+2 pin PCIe power cable can be used as either a 6-pin or 8-pin connector. The technician can use the 8-pin cable and the 6+2 pin cable (with the 2-pin attached) to provide two 8-pin connections.

The 'Replace Toner' error after installing a new cartridge often means the cartridge is not properly seated or the protective seal was not removed. Removing the seal allows toner to flow, and reseating ensures the printer detects the cartridge correctly.

RAID 1 mirrors data across two drives, so usable capacity equals the size of one drive (4 TB). This provides redundancy, not increased storage. RAID 0 would combine capacity, and RAID 5 requires at least three drives.

This question covers cloud deployment models. A hybrid cloud combines public cloud services (for email/collaboration) with private or on-premises infrastructure (for sensitive data). Public cloud alone would violate regulations, community cloud is for shared industry needs, and private cloud is entirely on-premises, missing the benefits of public cloud for non-sensitive workloads.

This question tests knowledge of common mobile app installation issues. The most likely cause is that the device's operating system is too old to support the app, as app developers often set minimum OS requirements. Checking the app's compatibility with the device's OS version is a standard troubleshooting step.

If a device is listed but won't connect, it may be a cached pairing record. Forgetting the device and re-pairing clears the old profile and allows a fresh connection. This is a standard troubleshooting step for Bluetooth issues.

In the 2.4 GHz band, channels 1, 6, and 11 are non-overlapping. If channel 6 is congested, switching to 1 or 11 can reduce interference from neighboring networks.

This question tests understanding of proxy servers and HTTP/HTTPS forwarding. A proxy server typically uses HTTP or HTTPS to forward client requests to external web servers, acting as an intermediary. The scenario implies the proxy is working internally but failing externally, pointing to the protocol used for external communication.

Horizontal white lines on inkjet output often indicate a paper feed issue, such as dirty or worn feed rollers. The roller's surface can lose traction, causing the paper to feed unevenly and creating gaps. Cleaning or replacing the feed rollers typically resolves the problem.

Local communication working while internet access fails points to a problem with the router or the connection between the switch and the router. The switch itself is functioning correctly for local traffic, so the issue is upstream.

This question tests knowledge of iOS enterprise features. Enabling a passcode and using MDM are both needed, but the passcode is the prerequisite for encryption and remote wipe. The other options are not directly related to encryption or remote management.

The default gateway is required for routing traffic to other networks, such as the internet. Without it, the computer can still communicate with devices on the same subnet (local LAN) but cannot reach external networks.

An IP address in the 169.254.x.x range indicates that the device failed to obtain an address from a DHCP server, resulting in Automatic Private IP Addressing (APIPA). This typically points to a DHCP server issue or network connectivity problem preventing DHCP communication.