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 can cause the wireless adapter to reduce power or disconnect to save battery, especially when signal strength changes. This often results in intermittent disconnections when moving.
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
This question tests knowledge of cabling standards and switch capabilities. Cat6a supports 10 Gbps up to 100 meters, so the cabling is sufficient. The bottleneck is the switches, which must be upgraded to 10 Gbps models.
SFP+ modules can be used for fiber connections if needed, but the question focuses on copper.
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.
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
This question tests understanding of switch port speeds and network congestion. A 10/100 switch limits each workstation to 100 Mbps, which can cause bottlenecks with multiple users. Upgrading to a Gigabit switch would provide 1000 Mbps per port, alleviating the slowdown.
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
With VLSM, the largest subnet should be assigned first. Sales needs 50 usable addresses, so a /26 subnet (255.255.255.192) provides 62 usable addresses, which is sufficient and efficient. Smaller subnets would not accommodate 50 devices.
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
Bluetooth audio requires correct profile support; the most common issue is the phone using the wrong audio profile (e.g., HSP for calls vs. A2DP for media). The headset may be connected but not set as the active audio device for 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 (often a software tool on a laptop or mobile device) measures signal strength in dBm and can display coverage heat maps. A multimeter measures electrical signals, not RF. A spectrum analyzer measures RF interference but is more complex.
A cable tester is for wired connections.
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
A USB-C to 3.5mm adapter converts the digital USB-C signal to analog audio, allowing the headset to work. A splitter would not help because the tablet lacks a 3.5mm port. The correct answer is a USB-C to 3.5mm adapter.
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 port 993. This provides encrypted access to email, protecting credentials and data on public networks.
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
Cables run through ceilings without proper support can be damaged by ceiling tiles or other equipment. The intermittent nature suggests a physical issue like a kink or pinch. Always ensure cables are secured and protected in plenum spaces.
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 locations far from wired infrastructure because it requires only a clear view of the sky. DSL, cable, and fiber all depend on physical cabling that is not available in such a remote area.
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.
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
Shielded twisted pair (STP) cables have a metal shield that reduces EMI. In industrial environments with heavy machinery, STP is preferred over unshielded cables. Fiber optic would also work but is more expensive and harder to terminate.
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
Internet Printing Protocol (IPP) uses port 631 by default. Opening this port allows print jobs to be sent to the printer over the network.
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
This question tests basic network troubleshooting steps. A link light indicates physical connectivity, but no activity suggests a configuration issue. Checking the IP address assignment is the logical first step before replacing hardware.
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
A static IP must be within the same subnet as the network but outside the DHCP pool to avoid conflicts. The subnet is 192.168.1.0/24, so valid addresses range from 192.168.1.1 to 192.168.1.254, with the router at .1 and DHCP pool from .100 to .200. Addresses like .50 are outside the pool and within the 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
Fiber internet requires an Optical Network Terminal (ONT) to convert the optical signal to electrical signals for use by a router. A cable modem is for coax, a DSL modem is for phone lines, and a satellite modem is for satellite dishes.
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
This question tests diagnosis of a no-display condition with power-on indication. Vibration confirms the device is booting, so the issue is likely with the display assembly or its connection. A failed LCD panel or a loose display cable is the most probable cause, as the backlight or digitizer failure would still show some light or touch response.
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
USB-C can carry video signals via DisplayPort Alt Mode or Thunderbolt, but not all USB-C cables support the necessary bandwidth for 4K. A cable that only supports USB 2.0 or lower data rates cannot handle the high resolution. The user likely needs a cable rated for DisplayPort Alt Mode or Thunderbolt.
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
Intermittent flickering often points to a loose or damaged cable or port. Since the adapter works elsewhere, the issue is likely with the laptop's USB-C port or the cable connection. The correct answer is a loose connection at the laptop 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
A card reader that connects to the smartphone via the headphone jack or Bluetooth is essential for processing credit card payments. This accessory allows the phone to read the magnetic stripe or chip. The correct answer is a dedicated card reader.
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
APN settings define how the device connects to the carrier's data network. An incorrect APN can result in connectivity but with throttled or misrouted data, leading to slow speeds.
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
This scenario tests systematic troubleshooting for a single app crash. After a restart, the next step is to clear the app's cache/data or reset its settings, as corrupted browsing data is a common cause of crashes. For Safari on iOS, this is done via Settings > Safari > Clear History and Website Data.
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
SIP (Session Initiation Protocol) typically uses port 5060 for unencrypted traffic and port 5061 for encrypted traffic. Port 80 is for HTTP, port 443 for HTTPS, and port 1720 for H.323. If port 5060 is blocked, SIP registration will fail.
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
Microwaves emit strong interference on the 2.4 GHz band. Moving the printer to the 5 GHz band avoids that interference. Changing the channel on 2.4 GHz may help but is less effective.
Replacing the router or printer is unnecessary.
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
This scenario tests knowledge of SNMP (Simple Network Management Protocol), which is used to monitor and manage network devices. SNMP agents on devices send data to a management system; if not configured, the device won't report.
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 up gives each VM more resources, reducing contention and speeding up logins.
Why this answer
This question addresses resource contention in cloud VDI. High utilization (95%) indicates the provider's resources are saturated, causing slow logins. Scaling up (vertical scaling) by increasing the VM size provides more CPU/RAM per user, improving performance.
Scaling out adds more VMs but doesn't address the root cause of resource saturation on existing VMs. Migrating to a different model or disabling auto-scaling could worsen the issue.
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
A USB-C to HDMI adapter leverages the smartphone's DisplayPort Alt Mode to output video to the projector's HDMI input. A USB-C hub with HDMI would also work, but a direct adapter is the simplest. A wireless adapter or USB-C to USB-A cable cannot carry video signals.
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
This question tests knowledge of wireless roaming and signal management. To prevent sticky clients, the technician should adjust the minimum RSSI (Received Signal Strength Indicator) settings on the APs so that clients are disconnected when the signal is weak, encouraging them to roam to a stronger AP.
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 (or advanced cable tester) can measure signal-to-noise ratio and detect excessive noise or interference on the cable. This tool provides quantitative data to confirm EMI issues, unlike simpler testers.
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 alternative HTTP port, often for proxy servers or to avoid conflicts with standard port 80. It allows HTTP traffic without using the default port.
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
A cable that was working but now fails often indicates physical damage. The length is within spec, so it's not a distance issue. The most common cause is a break or cut in the cable, possibly from recent activity.
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
SMTP uses port 25 for sending emails. If outgoing email fails but incoming works, port 25 is likely blocked. Port 110 (POP3) and 143 (IMAP) are for receiving email, and 993 is IMAPS (secure IMAP).
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.