CompTIA A+ Core 1 220-1201 (220-1201) — Questions 376–450

Windows 11 requires UEFI with GPT partition table and Secure Boot. The error indicates the drive is using MBR, which is incompatible with UEFI. The technician should either convert the drive to GPT using diskpart or reinitialize it as GPT during installation.

A red LOS (Loss of Signal) light on the ONT indicates that no light is being received from the optical line terminal (OLT) at the central office. Since the fiber cable appears intact, the most likely cause is a dirty or damaged connector at the ONT or the wall jack, which can attenuate the optical signal below the receiver threshold. Cleaning the fiber connector with a proper one-click cleaner or inspection scope is the standard next step before considering hardware replacement.

This question tests systematic troubleshooting. Since the hardware appears fine and other devices work, the issue is likely software-related. Checking IP configuration with ipconfig is the logical first step to see if the adapter has a valid IP or is stuck with an APIPA address.

The correct answer is A because front-panel USB ports are often connected via internal headers that may only support USB 2.0 speeds, especially in older cases. This tests understanding that USB 3.0 requires a blue port and proper internal cabling for full speed.

A yellow exclamation mark in Device Manager indicates a driver problem, but since updating the driver did not help, the issue may be a hardware conflict or a disabled device. The next step is to check if the webcam is physically disabled via a function key (e.g., Fn+F10) or a privacy shutter. Many laptops have a hardware switch or a keyboard shortcut to disable the camera for privacy.

DNS (Domain Name System) is the correct service because it resolves hostnames (like \\fileserver) to IP addresses in a Windows domain environment. When a user types \\fileserver in File Explorer, the client queries DNS to obtain the server's IP address, enabling SMB file sharing. Active Directory relies on DNS for service location and name resolution, making it the mandatory service for this task.

A captive portal intercepts HTTP traffic and redirects the client to a login page, typically by performing a DNS or HTTP redirect. If the tablet has a static IP address configured, it may not receive the DHCP options (e.g., option 114 for captive portal URL) or the proper DNS server settings, preventing the redirect from functioning. Without a valid DHCP lease, the tablet cannot be redirected to the captive portal login page.

The most likely issue is that the liquid spill has physically damaged or disconnected the touchpad's ribbon cable, which connects the touchpad to the motherboard. Since the keyboard still works, the spill likely affected only the touchpad's dedicated connection path, not the main keyboard controller or system board. A damaged ribbon cable is a common consequence of liquid ingress, even if the laptop powers on normally.

This question tests knowledge of USB port power delivery and cable length limitations. Front USB ports often share a single internal header and may deliver less power than rear ports directly on the motherboard, causing high-power devices like external hard drives to fail.

Even if the CPU itself is functional, instability can arise from other factors. Overheating due to a failing fan can cause intermittent crashes. The CPU fan is critical for maintaining safe temperatures under load.

Port 25 is the default SMTP port used for outgoing email transmission. If a firewall blocks port 25, the Outlook client cannot connect to the SMTP server to send emails, but receiving via POP3 (port 110) or IMAP (port 143) remains unaffected. This matches the user's symptom of being able to receive but not send emails.

The host only has 2 GB free, but the VM requests 4 GB, causing the host to use swap memory. Reducing the VM's RAM allocation to 2 GB will allow both the host and VM to run within physical memory, avoiding swapping.

This scenario tests the concept of elasticity in cloud computing. Elasticity allows resources to automatically scale up or down based on demand, which is ideal for handling traffic spikes. Scalability is a broader term that can include manual scaling, while high availability and fault tolerance focus on uptime, not automatic adjustment to load changes.

Vertical lines appearing during POST (pre-OS) indicate a hardware-level issue, most commonly a failing graphics card (GPU) or a damaged video memory. Since the problem occurs before Windows loads, it is not a driver or software issue. Testing with a known-good GPU or reseating the existing one is the recommended step.

This question tests knowledge of mobile printing solutions in a network environment. AirPrint is a built-in iOS feature that discovers printers on the same network via Bonjour. Google Cloud Print is deprecated, and Bluetooth or USB tethering are not suitable for a wired network.

The internal website is accessed by its hostname, which clients resolve via DNS. Since employees can reach the internet (so general DNS works) but not the local server, the most likely cause is that the DNS server lacks a host record (A or AAAA record) for the internal website's name, preventing name-to-IP resolution for 192.168.1.10. DHCP is functioning correctly because clients receive IP addresses and can access the internet.

To support 8 subnets with at least 1000 usable hosts each, you need to borrow enough bits from the host portion to create 8 subnets (2^3 = 8) while leaving at least 10 host bits (2^10 - 2 = 1022 usable hosts). Starting from /16, borrowing 3 bits gives a /19 prefix, which translates to subnet mask 255.255.224.0. This mask provides exactly 8 subnets and 8190 total hosts per subnet (2^13 - 2 = 8190), well exceeding the 1000-host requirement.

The most likely cause is interference between Bluetooth and Wi-Fi on the 2.4 GHz band. Both Bluetooth and Wi-Fi (802.11b/g/n) share the same 2.4 GHz ISM band, and Bluetooth uses adaptive frequency hopping (AFH) to avoid collisions, but when a Bluetooth device is active, it can still cause co-channel interference with Wi-Fi, leading to dropped connections. This is a well-known issue, especially with older or poorly shielded hardware.

Since the charging pad works with another phone, the issue is with the user's phone. A thick case, especially one with metal or magnetic components, can interfere with wireless charging and cause overheating. The correct answer is a case with metal or magnetic parts.

Horizontal white lines on inkjet output often indicate clogged printhead nozzles. Running the printer's cleaning cycle is the first recommended step to clear dried ink from the nozzles.

Since the ping succeeds, the printer is reachable at the network level. The issue is likely with the printer configuration or the print spooler on the computer. Common causes include the printer being offline, paused, or having a driver issue.

Fans spinning indicates the card is receiving power, but a blank display often means the monitor is not receiving a signal. The most common oversight is connecting the display cable to the motherboard's video port instead of the new graphics card's ports.

Option B is correct because the laptop's USB-C port supports DisplayPort Alt Mode, which can carry a DisplayPort signal over the USB-C connector. Since the monitor only has HDMI input, a USB-C to HDMI adapter converts the DisplayPort signal from Alt Mode into an HDMI-compatible signal, enabling the 4K video output.

This scenario tests understanding of application virtualization, where a legacy OS runs as a guest on a modern host. Using a Type 2 hypervisor like VirtualBox allows Windows 7 to run inside Windows 11, solving the compatibility problem without hardware changes.

A toner and probe (often called a fox and hound) is specifically designed to trace the physical path of a cable through walls, ceilings, and conduits. The toner injects an analog audio signal onto the cable, and the inductive probe detects that signal without needing a direct electrical connection, allowing the technician to follow the cable's route even when it is hidden behind building materials.

When a network printer appears idle but jobs disappear, the issue is often with the print spooler on the server or client. The spooler may be stalled or corrupted, causing jobs to be lost without error. Checking the print queue on the server and restarting the spooler service is the appropriate first step.

The correct answer is C because the external monitor works perfectly via VGA, which bypasses the laptop's internal LCD panel and its video cable. Distorted colors and horizontal lines on the built-in display, combined with a flawless external display, isolate the fault to the LCD panel assembly or the LVDS/eDP cable connecting the panel to the motherboard. The GPU and driver are shared between both displays, so they cannot be the cause when the external display functions correctly.

The 4+4 pin CPU connector can be used as either a 4-pin or 8-pin connector. The technician must ensure that both 4-pin halves are connected together to form the 8-pin CPU power connector required by the motherboard. If only one 4-pin half is connected, the CPU may not receive power.

The most likely cause is that the tablet is using the wrong Bluetooth profile or driver for the printer. Bluetooth printers typically use the Serial Port Profile (SPP) or Hardcopy Cable Replacement Profile (HCRP) to receive print data. If the tablet's POS app or Bluetooth stack is sending data using a different profile (e.g., A2DP for audio or HID for input), the printer will receive garbled or uninterpretable data, even though the devices are paired.

ECC and non-ECC RAM are not interchangeable; servers that require ECC will not boot or may operate incorrectly with non-ECC modules. Additionally, mixing ECC and non-ECC is not supported. The technician must use ECC RAM specifically designed for the server.

A capacitive stylus with a fine tip (Option B) is the most appropriate accessory because it allows the field worker to accurately capture signatures on the tablet's touchscreen. Capacitive styluses work by mimicking the electrical properties of a human finger, and a fine tip provides the precision needed for signature capture without relying on a digitizer or active pen protocol.

RAID controllers use cache batteries to protect data in write cache during power loss. When the battery is low, the controller may disable write caching to prevent data loss, causing write performance to drop. This tests knowledge of RAID controller cache behavior.

Using dual-channel memory (two matched sticks) provides a performance boost over a single stick because it allows the memory controller to access both modules simultaneously. For 32 GB, two 16 GB sticks are the best balance of performance and capacity.

This scenario tests knowledge of duplex scanning settings on a multifunction device. The ADF is feeding pages correctly, but the printer is set to simplex scanning, which only scans one side. Changing the scan mode to duplex will resolve the issue.

Continuous short beeps typically indicate a power supply failure or a motherboard power issue. However, given the recent RAM upgrade, it is more likely that the new RAM is incompatible or not seated correctly. The technician should first reseat the RAM and try the original modules to isolate the problem.

An anti-glare screen protector uses a matte finish with microscopic ridges that diffuse reflected light, reducing glare and improving contrast in bright environments. This directly addresses the technician's issue of poor readability in direct sunlight without adding significant bulk to the ruggedized tablet.

To allow all users on a subnet to print without a dedicated server, the printer should be configured with a static IP address and connected via Ethernet. This makes it a network printer accessible by IP. USB connection would only allow local printing from one computer.

DNS (Domain Name System) resolves friendly hostnames (e.g., fileserver.company.local) to IP addresses, allowing clients to automatically discover the server without manual IP entry. DHCP assigns IP addresses dynamically, but does not provide name resolution; DNS is the correct service for mapping names to IPs.

Option B (192.168.1.10) is correct because it falls within the private IPv4 address range defined by RFC 1918 for Class C networks (192.168.0.0/16). Private IP addresses are reserved for internal LAN use and are not routable on the public internet, making them appropriate for a workstation behind a router performing NAT.

The coffee shop's network uses a /24 subnet (255.255.255.0), which means all devices must have an IP address in the 192.168.1.0/24 range to communicate with the gateway at 192.168.1.1. The laptop's IP address of 192.168.2.10 falls in a different subnet (192.168.2.0/24), so the laptop cannot send frames to the gateway or receive a DHCP lease, preventing internet access despite a successful Wi-Fi association.

A print job stuck in the queue but not printing for one user often indicates a driver or spooler issue specific to that user's workstation. Corrupted print spooler files or incorrect driver settings can cause this, while the MFP itself and network are fine.

An amber LED on a redundant PSU indicates a fault or warning, but the server remains operational on the other PSU. The faulty unit should be replaced as soon as possible to restore redundancy. Ignoring it risks downtime if the second PSU fails.

The correct interface is Ethernet (RJ45) because the ONT typically converts the fiber-optic signal from the ISP into a standard electrical Ethernet signal, which is then delivered to the customer's router via a copper Ethernet cable. Most residential and small business fiber installations use an RJ45 port on the ONT to connect to the router's WAN interface, supporting speeds up to 1 Gbps or higher using 1000BASE-T.

The most logical first step is to ensure the device has power; a drained battery is a common cause of a device not turning on. Checking the charge level and attempting to charge it is a simple, non-invasive test that can quickly identify the problem.

Most cloud IaaS providers allow creating a new volume from a snapshot, which can then be attached to the existing VM. This is faster than restoring the entire VM from a full image. The technician should create a new disk from the snapshot and attach it, then copy the data to the original disk if needed.

The inverter board is responsible for converting DC power from the power supply into the high-voltage AC required to drive the CCFL (cold cathode fluorescent lamp) backlight in older LCD monitors. When the inverter fails, the backlight either dims significantly or fails entirely, even though the LCD panel itself may still be receiving a valid video signal and the brightness controls appear to function. This matches the symptom of a very dim display at maximum brightness settings.

B is correct because MMS requires a properly configured APN (Access Point Name) to establish the data connection for sending and receiving multimedia content. Since SMS works (which uses the control channel, not data), but MMS fails despite cellular data being enabled, the most likely issue is that the MMS APN settings are incorrect or missing. Without the correct APN, the device cannot route MMS traffic through the carrier's multimedia messaging center.

The Super I/O chip is responsible for monitoring hardware sensors, including CPU temperature, and can trigger a hardware-level shutdown if thresholds are exceeded. The BIOS/UEFI configures these thresholds, but the actual monitoring is done by the Super I/O. The chipset and voltage regulator module do not perform thermal monitoring.

Since the computer can access the internet but cannot ping the printer on the same subnet, the issue is at Layer 2 (Data Link) rather than Layer 3 (Network). ARP (Address Resolution Protocol) is responsible for resolving a known IP address to a MAC address on the local subnet. If the ARP cache is corrupted, missing, or the printer fails to respond to ARP requests, the computer cannot build the correct Ethernet frame to reach the printer, causing the ping to fail even though the printer is powered on and on the same subnet.

C is correct because cable internet uses a shared coaxial cable node, and during peak evening hours, many subscribers in the same neighborhood are actively using the connection. This shared bandwidth leads to contention and reduced throughput, especially for high-bandwidth activities like streaming video, which is a classic symptom of node congestion rather than a local issue.

The correct first step is to power off the laptop and remove the battery. This ensures safety and prevents electrical shorts or damage during replacement. After removal, the technician can install a new battery.

This is a classic symptom of a failing or overheating network interface card (NIC). High data throughput generates heat, and a marginal NIC may fail under sustained load, while low-bandwidth tasks work fine.

Option C is correct because 802.11ac operates exclusively on the 5 GHz band, and combining MIMO (multiple-input multiple-output) with an 80 MHz channel width maximizes throughput by increasing spatial streams and spectral bandwidth. This configuration supports the high data rates required for 4K video streaming, typically exceeding 1 Gbps aggregate throughput.

The PSU's +12V rail is rated for 62A, and the total load after adding drives is 58A, which is within the rating. However, it is good practice to leave headroom (typically 10-20%) to avoid running the PSU at maximum capacity, which can reduce efficiency and lifespan. In this case, the PSU is technically adequate but marginal.

This scenario points to a client-specific configuration problem. Since other devices work, the issue is isolated to the user's laptop, and a misconfigured DNS setting is a common cause for internet access failure while local network connectivity remains intact.

Physical-to-Virtual (P2V) migration converts a physical machine into a virtual disk image, preserving the OS, applications, and hardware identifiers. This is the standard method for moving legacy systems to virtual environments.

SMTP (Simple Mail Transfer Protocol) is used for sending outgoing email messages. By default, SMTP uses port 25. If the firewall blocks outbound traffic on port 25, the email client can still receive messages (using POP3 or IMAP) but will be unable to send any, perfectly matching the user's symptoms.

Intel VT-x or AMD-V is the hardware virtualization feature that must be enabled in the CPU configuration section of UEFI. Without it, virtual machines will run slowly or fail to start. This tests knowledge of common UEFI settings for virtualization.

A point-to-point bridge over 500 meters requiring 1 Gbps throughput needs high-gain, directional antennas and a frequency band with sufficient bandwidth. Parabolic dish antennas on 5 GHz provide the necessary high gain (typically 20-30 dBi) and utilize the wider 5 GHz channel bandwidth (up to 80 or 160 MHz) to achieve gigabit speeds, while maintaining a narrow beamwidth to focus the signal between the two buildings.

When traveling internationally, cellular data requires the device's data roaming setting to be enabled to connect to foreign networks. Even with an active international roaming plan, the smartphone will not automatically use data on a visited network unless this setting is turned on. This is a standard requirement across GSM and LTE networks, as data roaming is disabled by default to prevent unexpected charges.

DNS (Domain Name System) resolves the friendly hostname 'fileserver' to the server's IP address, allowing users to use \\fileserver\share instead of an IP address. Without DNS, the SMB client cannot translate the name, and the connection fails. This makes DNS the correct protocol for name resolution in this scenario.

A repeating defect at a regular interval is often caused by a damaged roller, and the interval helps identify which roller. A 3-inch interval matches the circumference of the fuser roller. The drum's circumference is typically larger, so the interval would be different.

Ghosting or image retention on an IPS panel is often due to burn-in or temporary image persistence. This occurs when static images are displayed for long periods, causing the liquid crystals to not fully relax. It is a hardware defect that may be irreversible.

Standard web traffic uses HTTP on port 80, while encrypted web traffic uses HTTPS on port 443. Opening these two ports in the firewall allows the web server to serve both unencrypted and TLS/SSL-encrypted content to clients.

802.11n (Wi-Fi 4) operates in both the 2.4 GHz and 5 GHz bands, but its key advantage for this scenario is the 2.4 GHz band, which offers longer range and better penetration through obstacles like metal shelving and concrete walls due to lower frequency and better diffraction characteristics. It also supports MIMO (Multiple Input Multiple Output) with up to four spatial streams, which can improve signal robustness in multipath environments typical of warehouses.

TPM (Trusted Platform Module) is often disabled by default in the UEFI firmware. It must be enabled in the security settings of the UEFI. Additionally, the system must be set to UEFI mode (not Legacy) with Secure Boot enabled for Windows 11 compatibility.

The loose component is a battery connector bracket or grounding clip, which is typically secured with adhesive to prevent the battery connector from dislodging. Reattaching it with double-sided adhesive tape restores mechanical stability without soldering, as these parts are not soldered to the motherboard. This ensures reliable power delivery and prevents intermittent shutdowns or charging issues.

A series of long, continuous beeps typically indicates a memory (RAM) issue, not a graphics card problem. This is a common POST code that helps isolate hardware faults before the system can boot.

This question tests the distinction between PaaS and other service models. Platform as a Service (PaaS) provides a managed platform including OS, runtime, and database, allowing the customer to focus on deploying their application without patching the OS. IaaS gives full control but requires OS management, SaaS is a finished application, and DaaS is for virtual desktops.

OSPF uses multicast address 224.0.0.5 (AllSPFRouters) to exchange hello packets and LSAs. If multicast forwarding is disabled or blocked between the routers (e.g., by an ACL, switchport configuration, or lack of multicast routing), OSPF neighbors will not form, and routes will not be exchanged. Since both offices can ping each other's directly connected interfaces, Layer 3 unicast connectivity exists, but OSPF's multicast-based neighbor discovery is failing.