A technician is troubleshooting an HDMI over Ethernet solution. The network link lights on the transmitter and receiver are both active. The TV that is connected to the receiver unit is getting audio, but video is intermittently flashing. Which of the following should the technician check next to find the source of the issue?
A. HDMI signal source
B. PoE power
C. Firmware on TV
D. Network cable termination
Show Answer
Correct Answer: D
Explanation: Active link lights and working audio indicate the devices are powered and communicating, but intermittent video flashing points to signal integrity problems. HDMI over Ethernet is sensitive to cabling quality; poor or incorrect network cable termination can cause intermittent video loss while audio continues, making the cable termination the most likely source to check next.
Question 21
A user reports that they cannot get their laptop to work with a video projector connected with an HDMI cable. The projector is turned on, the HDMI cable is securely connected on both ends, and the laptop displays properly on its own screen. The display mode is set to "Duplicate" on the laptop. Which of the following is most likely causing the issue?
A. The projector does not support HDMI connections.
B. The laptop display mode should be set to "Extend".
C. An HDMI port on the projector failed.
D. The input source is incorrect on the projector.
Show Answer
Correct Answer: D
Explanation: With the laptop set to Duplicate and displaying correctly on its own screen, and the HDMI cable securely connected, the most common remaining cause is that the projector is set to the wrong input source. Projectors often have multiple inputs (HDMI, VGA, DisplayPort), and if the active input does not match the connected HDMI port, no image will appear even though everything else is functioning.
Question 22
A technician wants to evaluate several desktop Linux OSs simultaneously. Which of the following is the best way to accomplish this task?
A. Container
B. Sandbox
C. Hypervisor
D. VDI
Show Answer
Correct Answer: C
Explanation: To evaluate several desktop Linux operating systems simultaneously on one machine, a hypervisor is the best choice. A hypervisor allows multiple full virtual machines to run at the same time, each with its own OS installation, desktop environment, and configuration. Containers share the host OS kernel and are not suitable for testing different desktop OSs, sandboxes are typically for application isolation, and VDI is for delivering desktops to users rather than locally evaluating multiple OSs.
Question 22
A technician is configuring a new office network for a customer. Which of the following subnets should the technician use for the local network?
A. 52.84.52.0/25
B. 85.159.80.0/26
C. 172.31.88.0/24
D. 195.205.143.160/27
Show Answer
Correct Answer: C
Explanation: Local office networks should use private IP address space (RFC 1918). The private ranges are 10.0.0.0/8, 172.16.0.0–172.31.255.255 (/12), and 192.168.0.0/16. The subnet 172.31.88.0/24 falls within the private 172.16.0.0/12 range, making it appropriate for a local network. The other options are public IP subnets and should not be used internally.
Question 23
A user is having issues displaying the contents of their laptop screen on a projector. The laptop is connected using an HDMI cable, but the screen displays a message indicating there is no signal. Which of the following should the technician do first to diagnose the issue?
A. Check the projector input sources.
B. Replace the HDMI cable.
C. Change the resolution of the screen to 1080p.
D. Verify the HDMI port is not damaged.
Show Answer
Correct Answer: A
Explanation: The first diagnostic step should be to verify that the projector is set to the correct input source. A "no signal" message is most commonly caused by the projector listening to the wrong input (e.g., VGA instead of HDMI). This is a quick, non-invasive check and should be done before replacing cables, changing display resolution, or inspecting hardware for damage.
Question 23
A customer reports that the output from their thermal receipt printer has vertical white lines. Which of the following would most likely resolve this issue?
A. Replacing the ink cartridge
B. Using the correct paper type
C. Installing a maintenance kit
D. Cleaning the heating element
Show Answer
Correct Answer: D
Explanation: Thermal printers create images by selectively heating elements across the print head. Vertical white lines indicate that specific heating elements are not transferring heat properly, usually due to dirt or residue buildup. Cleaning the heating element restores proper contact and heat transfer. Ink cartridges are not used in thermal printers, paper type issues cause overall print quality problems rather than distinct vertical lines, and maintenance kits are more relevant to impact or laser printers.
Question 24
A customer reports that internet browsing on their smartphone is fast at the beginning of the month but significantly slows down toward the end of the month. A technician examines the phone and finds multiple free cloud backup services running, with several gigabytes of personal data spread across each. Data availability is important to the customer. Which of the following is the best way to resolve the customer's issue?
A. Disabling all cloud backup services except one
B. Installing an additional SD card for photos and videos
C. Expanding the cache storage to consolidate data
D. Configuring data synchronization only over Wi-Fi connections
Show Answer
Correct Answer: D
Explanation: The slowdown occurs toward the end of the month, which is characteristic of mobile data plan throttling after a usage threshold is reached. Multiple cloud backup services continuously syncing large amounts of data consume mobile data in the background. Configuring synchronization to occur only over Wi‑Fi preserves data availability while preventing excessive mobile data usage, avoiding end‑of‑month speed throttling.
Question 24
While using a laptop and Bluetooth headset for conference calls, a user notices intermittent sound issues. The user frequently walks between office rooms during the calls, leaving the laptop in place. The office wireless network uses fiber for internet access and consists of two wireless APs that are connected. Which of the following is most likely causing the connectivity issue?
A. The number of available APs is inadequate.
B. The user is moving in and out of range.
C. The APs are not in mesh mode.
D. The internet connection is too slow to support conference calls.
Show Answer
Correct Answer: B
Explanation: Bluetooth has a limited range and is sensitive to obstructions. As the user walks between rooms while leaving the laptop stationary, the headset intermittently moves out of effective Bluetooth range, causing audio dropouts. The wired internet speed and AP configuration are not the primary factors for a Bluetooth audio issue.
Question 25
Which of the following is used to register inputs on a touch-screen monitor?
A. Inverter
B. Digitizer
C. OLED
D. LCD
Show Answer
Correct Answer: B
Explanation: A touch-screen monitor registers input through a digitizer, which detects touch (via capacitive, resistive, etc.) and converts it into digital signals. Inverters, OLEDs, and LCDs are display-related components, not input-registering devices.
Question 25
A human resources manager printed a sensitive employee termination announcement and forgot to retrieve the document from the printer. Which of the following is a way to avoid this situation?
A. Badging
B. Duplex
C. Printer share
D. Wireless encryption
Show Answer
Correct Answer: A
Explanation: Badging (secure print release) requires the user to authenticate at the printer, such as with an ID badge, before the document is printed. This prevents sensitive documents from being left unattended in the output tray if the user forgets to retrieve them.
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