1. A technician needs to replace the battery in a modern ultrabook. The battery is glued to the chassis rather than secured with screws. What is the PRIMARY safety concern the technician must address during removal?
Mobile Devices
A.Voiding the manufacturer's warranty
B.Puncturing the battery causing fire or chemical exposure
C.Electrostatic discharge damaging the CPU
D.Overheating the adjacent RAM modules
Show answerAnswer
B. Puncturing the battery causing fire or chemical exposure
Glued-in lithium-ion batteries require careful prying with plastic tools to avoid puncturing the cell, which can cause a fire, chemical burns, or toxic fume release. This is a critical safety hazard beyond typical ESD or warranty concerns.
2. A company is migrating physical servers to the cloud but wants full control over operating systems, middleware, and application configurations. The provider should only be responsible for the physical hardware, virtualization layer, storage, and networking. Which cloud service model best fits this requirement?
Virtualization and Cloud Computing
A.Platform as a Service (PaaS)
B.A private on-premises data center
C.Infrastructure as a Service (IaaS)
D.Software as a Service (SaaS)
Show answerAnswer
C. Infrastructure as a Service (IaaS)
IaaS provides virtualized compute, storage, and networking while leaving the OS, middleware, and applications under the customer's control, matching the described requirement exactly.
3. A technician is troubleshooting a network printer that is accessible from some workstations but not others. The technician has confirmed that all workstations are on the same subnet and can ping the printer's IP address. Which of the following is the MOST likely cause of this issue?
Hardware and Network Troubleshooting
A.Firewall blocking print services on affected workstations
B.The printer has run out of toner or ink
C.IP address conflict on the network
D.Incorrect print driver installed on the affected workstations
Show answerAnswer
A. Firewall blocking print services on affected workstations
If some workstations can access the printer and others cannot, despite being on the same subnet and able to ping, it suggests a local issue on the affected workstations. A firewall blocking the necessary print ports (e.g., TCP 9100, UDP 161/162) is a common cause.
4. A home user's laptop can reach devices on the local network but cannot access any websites on the internet. The IP configuration shows a valid IP address, subnet mask, and DNS server, but the 'Default Gateway' field is blank. What is the MOST likely reason the user cannot browse the internet?
Networking
A.The device cannot route traffic outside the local subnet without a gateway
B.The subnet mask is too large
C.The wireless adapter is disabled
D.The DNS server address is incorrect
Show answerAnswer
A. The device cannot route traffic outside the local subnet without a gateway
The default gateway is the router address a device uses to send traffic destined for networks outside its own subnet, such as the internet. Without it, local communication works but internet-bound packets have nowhere to go.
5. A technician is terminating a newly run Ethernet cable at a wall jack and must crimp the correct connector onto the end for a standard wired network drop. Which connector should the technician use?
Networking
A.RJ45
B.F-connector
C.RJ11
D.BNC
Show answerAnswer
A. RJ45
RJ45 is the standard 8-position, 8-contact connector used for Ethernet (twisted-pair) network cabling. RJ11 is for telephone lines, F-connectors are for coax, and BNC is used with older coax networking or video.
6. A technician is assigned the IPv6 network 2001:db8:acad:1::/64 and needs to further divide it into 16 equal-sized subnets for different departments. What subnet prefix length should the technician use for each subnet?
Networking
A./60
B./68
C./64
D./70
Show answerAnswer
B. /68
To create 16 equal subnets, the technician needs 4 additional bits (2^4 = 16), so the prefix length increases from /64 to /68, giving 16 subnets of equal size.
7. A technician is deploying a Wi-Fi 6 access point in an office and wants to take advantage of the standard's ability to operate in a less congested frequency band with more available channels compared to legacy Wi-Fi. Which frequency band should the technician primarily configure?
Networking
A.5GHz
B.900MHz
C.60GHz
D.2.4GHz
Show answerAnswer
A. 5GHz
802.11ax (Wi-Fi 6) primarily operates in the 5GHz band, offering more channels and less interference than the crowded 2.4GHz band, which is used by many legacy devices and other equipment like microwaves and Bluetooth.
8. A technician needs to run a new network cable through a drop ceiling in an office building where local fire code requires that any cable routed through air handling spaces be rated to not emit toxic fumes when burned. Which cable type should the technician select?
Networking
A.Plenum-rated cable
B.Coaxial RG-6 cable
C.Direct burial cable
D.PVC-jacketed cable
Show answerAnswer
A. Plenum-rated cable
Plenum-rated cable is specifically designed with a jacket that produces less smoke and fewer toxic fumes when burned, making it required for installation in plenum spaces such as drop ceilings used for air circulation.
9. A technician is troubleshooting a desktop computer that experiences intermittent system freezes and blue screen errors, especially during graphically intensive tasks. The CPU temperature monitoring software shows spikes up to 95°C (203°F). What is the MOST likely cause of these symptoms?
Hardware
A.Overheating CPU
B.Outdated graphics driver
C.Failing hard drive
D.Insufficient RAM capacity
Show answerAnswer
A. Overheating CPU
Intermittent freezes and blue screen errors, particularly under load (graphically intensive tasks), combined with high CPU temperatures (95°C is well above safe operating limits for most CPUs), are classic symptoms of an overheating CPU. The system is likely throttling performance or crashing to prevent thermal damage.
10. A competitive gamer wants a new laptop display that offers the fastest pixel response time and highest refresh rate, and is willing to accept less accurate colors and narrower viewing angles as a trade-off. Which display technology should the technician recommend?
Mobile Devices
A.OLED
B.IPS
C.E-ink
D.TN
Show answerAnswer
D. TN
TN (Twisted Nematic) panels have the fastest response times and support the highest refresh rates, making them popular for gaming, but they sacrifice color accuracy and viewing angle compared to IPS or OLED.
11. A technician is configuring an email server so that outgoing mail can be relayed correctly. Which of the following TCP ports is used by default for sending email between mail servers?
Networking
A.110
B.25
C.143
D.21
Show answerAnswer
B. 25
SMTP (Simple Mail Transfer Protocol) uses TCP port 25 to send and relay email between mail servers. Port 21 is FTP, 110 is POP3, and 143 is IMAP, all of which are unrelated to sending outbound mail.
12. A user reports that their laptop is running extremely slowly, and applications frequently crash. The technician opens Task Manager and observes that the disk utilization is consistently at 100%, even when no major applications are running. The system has 8GB of RAM. What is the MOST likely cause of this performance issue?
Hardware and Network Troubleshooting
A.An overheating CPU throttling performance.
B.A failing hard disk drive (HDD) or solid-state drive (SSD).
C.A lack of sufficient free space on the primary partition.
D.Corrupted operating system files requiring reinstallation.
Show answerAnswer
B. A failing hard disk drive (HDD) or solid-state drive (SSD).
Consistent 100% disk utilization, especially without heavy application use, is a strong indicator of a failing hard disk drive (HDD) or solid-state drive (SSD). The drive struggles to read/write data, causing the system to wait and leading to extreme slowdowns and application crashes.
13. A user reports that their smartphone is no longer able to connect to any Wi-Fi networks. The Wi-Fi toggle in the settings menu is grayed out and cannot be enabled. Other wireless functions, such as Bluetooth and cellular data, are working correctly. What is the MOST likely cause?
Hardware and Network Troubleshooting
A.The Wi-Fi antenna is disconnected.
B.The cellular modem has failed.
C.The phone's operating system is corrupted.
D.The Wi-Fi adapter hardware has failed.
Show answerAnswer
D. The Wi-Fi adapter hardware has failed.
If the Wi-Fi toggle is grayed out and cannot be enabled, while other wireless functions work, it strongly indicates a hardware failure of the Wi-Fi adapter itself. The operating system recognizes the presence of the Wi-Fi hardware but cannot initialize it, often due to a chip-level failure or a connection issue specific to the Wi-Fi module.
14. A user reports that their laptop battery drains significantly faster than usual, even when the laptop is idle or in sleep mode. The laptop is only a year old, and the battery health report indicates 'Good' capacity. Which of the following is the MOST likely cause?
Hardware and Network Troubleshooting
A.Excessive background processes or applications.
B.Outdated BIOS firmware affecting power management.
C.A miscalibrated battery gauge.
D.A worn-out battery that needs replacement.
Show answerAnswer
A. Excessive background processes or applications.
If a laptop battery drains quickly despite being relatively new and reporting 'Good' health, the most likely cause is software-related, specifically excessive background processes or applications consuming power even when the system appears idle. These can keep the CPU or other components active, preventing the system from entering low-power states.
15. A technician upgrades a desktop's CPU to a newer generation processor that physically fits the existing LGA1700 socket. After installation, the system fails to POST. What is the MOST likely cause of this issue?
Hardware
A.The power supply wattage is too high
B.The RAM modules are the wrong type
C.The motherboard's BIOS/UEFI needs a firmware update to support the new CPU
D.The CPU cooler is incompatible with LGA1700
Show answerAnswer
C. The motherboard's BIOS/UEFI needs a firmware update to support the new CPU
Even when a CPU physically fits a socket, the motherboard's chipset may require a BIOS/UEFI update to recognize newer-generation processors. Without this microcode update, the system may fail to POST despite correct physical installation.
16. A technician cannot determine which of dozens of unlabeled cables in a wiring closet corresponds to a specific wall jack in an office. Which of the following tools should the technician use to identify the correct cable?
Networking
A.Cable certifier
B.Tone generator and probe
C.Multimeter
D.Loopback plug
Show answerAnswer
B. Tone generator and probe
A tone generator is connected to the cable at the wall jack, sending an audible signal that a probe can detect at the other end, allowing the technician to trace which cable in the closet corresponds to the jack. A cable certifier tests performance against a standard, a loopback plug tests NIC transmit/receive function, and a multimeter measures electrical properties like voltage or continuity, none of which trace a specific cable among many unlabeled ones.
17. An online retailer expects a massive spike in web traffic during a holiday sales event. The company wants its cloud environment to automatically add compute resources during the surge and automatically release them once traffic returns to normal, minimizing cost. Which cloud characteristic enables this behavior?
Virtualization and Cloud Computing
A.Resource pooling
B.Elasticity
C.Measured service
D.Multitenancy
Show answerAnswer
B. Elasticity
Elasticity is the cloud characteristic that allows resources to scale up or down automatically and rapidly in response to demand, ensuring cost efficiency and performance during traffic spikes.
18. A client reports that their inkjet printer is producing pages with streaks and missing colors, even after replacing the ink cartridges. What is the most likely cause of this issue?
Hardware
A.The paper tray is empty.
B.The print head is clogged.
C.The fuser assembly is faulty.
D.The printer driver is outdated.
Show answerAnswer
B. The print head is clogged.
Streaks and missing colors in inkjet printing, especially after cartridge replacement, are classic symptoms of a clogged print head. Inkjet printers have tiny nozzles that can become blocked with dried ink, preventing proper ink delivery.
19. A retailer normally runs its inventory application on a private cloud. During periods of unusually high demand, the application automatically shifts excess workload to a public cloud provider to maintain performance, then shifts the workload back once demand subsides. Which term describes this technique?
Virtualization and Cloud Computing
A.Multitenancy
B.Cloud bursting
C.VM migration
D.Resource pooling
Show answerAnswer
B. Cloud bursting
Cloud bursting is a hybrid cloud technique in which an application running in a private cloud automatically 'bursts' into a public cloud when demand exceeds private capacity, then returns when demand drops.
20. A server uses a RAID 1 mirror consisting of two drives. One drive fails completely and is removed for replacement. Which statement accurately describes the current state of the array?
Hardware and Network Troubleshooting
A.The array continues operating normally using the remaining drive, but redundancy is lost
B.The array automatically rebuilds using parity data stored across both drives
C.Read speeds double because only one drive is now being accessed
D.All data is lost because RAID 1 requires both drives to function
Show answerAnswer
A. The array continues operating normally using the remaining drive, but redundancy is lost
RAID 1 mirrors data identically across two drives, so if one drive fails, the array keeps functioning using the surviving drive with full data intact, though it is running without redundancy until a replacement is installed and remirrored. RAID 1 uses no parity, so option C is incorrect, and losing a drive does not improve read performance.
21. What is the maximum theoretical data transfer rate supported by the SATA III interface?
Hardware
A.6 Gbps
B.10 Gbps
C.3 Gbps
D.1.5 Gbps
Show answerAnswer
A. 6 Gbps
SATA III (SATA 6Gb/s) supports a maximum theoretical transfer rate of 6 Gbps, which translates to roughly 600 MB/s of real-world throughput after encoding overhead.
22. A technician is installing a new graphics card into a desktop computer. The graphics card requires external power, and the PSU has a spare 8-pin connector. Which of the following power connectors from the PSU is designed to provide auxiliary power to high-performance graphics cards?
Hardware
A.PCIe power connector
B.SATA power connector
C.EPS12V connector
D.Molex connector
Show answerAnswer
A. PCIe power connector
PCIe power connectors (6-pin or 8-pin) are specifically designed to provide supplemental power to graphics cards that draw more power than can be supplied by the PCIe slot alone.
23. A security auditor discovers that a SOHO router has a feature enabled that allows new wireless devices to join the network by pressing a physical button instead of entering the WPA2 passphrase. The auditor recommends disabling this feature because it is vulnerable to a PIN brute-force attack. Which feature should be disabled?
Networking
A.WPS
B.QoS
C.UPnP
D.MU-MIMO
Show answerAnswer
A. WPS
Wi-Fi Protected Setup (WPS) allows devices to join a network via a push button or PIN, but its 8-digit PIN implementation is vulnerable to brute-force attacks that can expose the WPA2 passphrase, so security best practice is to disable it.
24. A technician is running a cable television line from a wall outlet to a cable modem to establish internet service. Which cable type is designed for this connection?
Networking
A.Cat6a UTP
B.RJ11 twisted pair
C.RG-6 coaxial
D.Multimode fiber
Show answerAnswer
C. RG-6 coaxial
RG-6 coaxial cable, terminated with F-connectors, is the standard cable used to deliver cable television and cable internet signals from a wall outlet to a modem.
25. A user reports that their mobile phone's battery percentage drops suddenly from 30% to 5% and then shuts down, even though the phone was working normally moments before. This behavior is consistent and repeatable. Which of the following is the MOST likely cause?
Hardware and Network Troubleshooting
A.A failing battery that cannot accurately report its charge.
B.Operating system power management bug.
C.Excessive background app activity.
D.Poor cellular signal strength.
Show answerAnswer
A. A failing battery that cannot accurately report its charge.
A sudden, significant drop in battery percentage, especially from a moderate level to very low, is a classic symptom of a failing or degraded lithium-ion battery. The battery's internal resistance increases, causing its voltage to drop rapidly under load, and its ability to report accurate charge levels degrades.
Lithium-ion batteries adhered with adhesive require careful, gentle prying using plastic tools to avoid puncturing the cell and causing fire or chemical hazards.
Use plastic spudgers, never metal tools
Punctured lithium cells can ignite or swell rapidly
Adhesive removal solvents/heat can help loosen safely
When some devices can access a network printer and others cannot, despite basic network connectivity, local firewall rules or incorrect printer configuration on the affected devices are common culprits.
802.11ax operates on both 2.4GHz and 5GHz bands but is optimized to leverage 5GHz's wider channel availability and reduced congestion for higher throughput.
5GHz has more non-overlapping channels than 2.4GHz
2.4GHz has longer range but more interference
Wi-Fi 6E extends into 6GHz band for even less congestion
Plenum-rated cable has a special jacket (often FEP) that emits less smoke and toxic fumes when burned, required by fire code for installation in air handling spaces like drop ceilings and raised floors.
Required in plenum spaces per fire code
More expensive than standard PVC cable
PVC (riser-rated) cable is used in non-plenum vertical spaces
A display technology (Twisted Nematic) known for very fast response times and high refresh rates, but narrower viewing angles and weaker color reproduction.
Fastest response time of common panel types
Preferred for competitive/gaming laptops
Weaker color accuracy and viewing angles than IPS/OLED
A symptom on mobile devices where the Wi-Fi activation switch is disabled and cannot be toggled, often indicating a hardware failure of the Wi-Fi module.
Suggests the OS cannot initialize the Wi-Fi hardware.
Other wireless functions (Bluetooth, cellular) typically remain functional.
Often requires hardware repair or replacement of the Wi-Fi chip/module.
A condition where a mobile device's battery depletes quickly due to software activity, such as excessive background processes or applications, rather than a faulty battery or hardware.
Battery health report often shows good capacity.
Occurs even when the device appears idle or in sleep mode.
Requires identifying and managing power-intensive software.
A tone generator and probe (fox and hound) is a tool set used to trace and identify a specific cable among many unlabeled ones by sending and detecting an audible tone.
A common issue in inkjet printers where dried ink blocks the tiny nozzles of the print head, leading to poor print quality, streaks, or missing colors.
Often resolved by running the printer's built-in cleaning cycle.
Can be prevented by regular printer use.
Symptoms include streaky prints, blank lines, or incorrect colors.
A hybrid cloud technique where workload automatically overflows from a private cloud to a public cloud during demand spikes, then returns when demand decreases.
Requires hybrid cloud architecture
Maintains performance during traffic spikes
Reduces need to overprovision private infrastructure
A 6-pin or 8-pin power connector from a power supply unit (PSU) specifically used to provide additional electrical power to high-performance PCI Express (PCIe) graphics cards.
Modern graphics cards often require one or more PCIe power connectors.
A 6-pin connector provides up to 75 watts, an 8-pin up to 150 watts.
Incorrectly connecting other power connectors can damage components.
WPS is a feature allowing easy wireless network joining via a push button or PIN, but its PIN method is vulnerable to brute-force attacks and should be disabled for security.
Push-button or 8-digit PIN method for joining Wi-Fi
RG-6 is a coaxial cable with better shielding than RG-59, commonly used for cable TV and cable modem internet connections, typically terminated with F-connectors.
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