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CCNA Display Devices Questions

30 questions · Display Devices topic · All types, answers revealed

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1
MCQeasy

A user reports that their external monitor connected via HDMI shows a blurry image and the text is hard to read. They have tried a different HDMI cable and the issue persists. What is the most likely cause?

A.The HDMI cable is defective.
B.The monitor's refresh rate is set too low.
C.The display resolution is set below the monitor's native resolution.
D.The graphics driver is corrupted.
AnswerC

A non-native resolution forces the monitor to scale, causing blurriness. Setting it to native resolution fixes this.

Why this answer

This scenario tests understanding of display resolution settings. The most common cause of blurry text on an external monitor is incorrect resolution scaling, not a cable or driver issue. Adjusting the display resolution to the monitor's native resolution will usually fix the problem.

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2
MCQhard

A technician is troubleshooting a monitor that displays a 'fuzzy' image with ghosting. The monitor is connected via VGA. The technician has already tried a different VGA cable and the issue persists. What should the technician check next?

A.Replace the monitor.
B.Change the resolution to a lower setting.
C.Route the VGA cable away from power cables and other electronics.
D.Update the graphics driver.
AnswerC

VGA cables are susceptible to electromagnetic interference, which causes ghosting. Moving the cable away from power sources can resolve this.

Why this answer

VGA is an analog signal that can be affected by electrical interference. Ghosting and fuzziness are classic symptoms of interference from nearby power cables or other electronics. Moving the VGA cable away from power sources is the next logical step.

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3
MCQhard

A technician is installing a new touchscreen monitor for a point-of-sale system. The monitor connects via HDMI and USB. The display works, but touch input is not recognized. What should the technician check first?

A.Ensure the HDMI cable is securely connected
B.Install the touchscreen driver from the manufacturer
C.Replace the USB cable with a higher-speed version
D.Calibrate the touchscreen in Windows settings
AnswerB

Touchscreens require a driver to interpret touch signals; without it, the USB data is not recognized as input.

Why this answer

Touchscreen monitors often require both video (HDMI) and data (USB) connections. The USB cable provides the touch data to the computer. If the driver is missing or the USB connection is faulty, touch input won't work.

The first step is to verify the USB connection and install the correct driver.

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4
MCQmedium

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?

A.The monitor's HDMI port is defective
B.The USB-C cable does not support DisplayPort Alt Mode
C.The laptop's graphics driver is outdated
D.The monitor's refresh rate is set too high
AnswerB

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.

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5
MCQmedium

A technician is configuring a dual-monitor setup for a stock trader. One monitor is a 24-inch 1080p display, and the other is a 27-inch 4K display. The user wants the mouse to move seamlessly between them. What setting must the technician configure in the OS display settings?

A.Set both monitors to the same resolution.
B.Adjust the scaling settings on the 4K monitor.
C.Arrange the displays in the OS to match their physical positions.
D.Set the 4K monitor as the primary display.
AnswerC

Properly arranging the displays in the OS ensures the mouse cursor moves seamlessly from one screen to the other.

Why this answer

When using monitors with different resolutions, the OS must align the virtual displays correctly. The technician needs to arrange the monitors in the display settings to match their physical layout, ensuring the mouse moves smoothly across the bezels.

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6
MCQhard

A technician is troubleshooting a projector that displays a faint, ghost-like image even when no input source is connected. The projector has been in use for several years. What is the most likely cause?

A.The projector bulb is nearing the end of its life
B.The LCD panel has image burn-in
C.The input cable is picking up interference
D.The projector's lens is dirty
AnswerB

Prolonged display of static images can cause permanent burn-in on LCD panels, resulting in a ghost image.

Why this answer

This is a classic symptom of a burned-in image on an LCD projector panel. Over time, static images can permanently etch into the panel, causing a ghost image. This is different from a faulty bulb, which would cause dimness or no light.

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7
MCQmedium

A user reports that their monitor displays a 'No Signal' message when they turn on their computer. The monitor is connected via DisplayPort. The technician checks that the monitor is powered on and the cable is secure. What should the technician check next?

A.Replace the monitor.
B.Check the input source setting on the monitor.
C.Try a different DisplayPort cable or port on the GPU.
D.Update the graphics driver.
AnswerC

A faulty cable or port can cause a 'No Signal' error. Trying a different cable or port is a standard troubleshooting step.

Why this answer

DisplayPort cables can sometimes have issues with the locking mechanism or be partially unseated. The next logical step is to try a different DisplayPort cable or port on the GPU to isolate the issue.

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8
MCQmedium

A user reports that their laptop's built-in display shows distorted colors and horizontal lines, but when they connect an external monitor via VGA, the external display works perfectly. What is the most likely cause?

A.The laptop's GPU is failing
B.The VGA cable is defective
C.The laptop's LCD panel or its video cable is damaged
D.The display driver is corrupt
AnswerC

Since the external display is fine, the internal panel or its connection is the likely culprit.

Why this answer

The internal display or its cable/connector is faulty because the external monitor works fine, ruling out the graphics adapter. This isolates the problem to the laptop's LCD panel or its connection.

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9
MCQmedium

A user reports that their desktop computer's display is very dim, even at maximum brightness settings. The monitor is an older LCD model with a CCFL backlight. What component is most likely failing?

A.The LCD panel itself
B.The inverter board
C.The video cable
D.The power supply unit
AnswerB

The inverter supplies high voltage to the CCFL backlight; when it fails, the backlight dims or goes out entirely.

Why this answer

CCFL-backlit LCD monitors use an inverter to convert DC power to high-voltage AC to light the fluorescent tube. A failing inverter often results in a dim display or one that flickers before failing completely. This is a common failure in older monitors.

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10
MCQhard

A user reports that their new high-resolution monitor (2560x1440) connected via DisplayPort shows intermittent black screens for a few seconds. The monitor works fine at lower resolutions. What is the most likely issue?

A.The monitor's power saving mode is too aggressive
B.The DisplayPort cable is not certified for the required bandwidth
C.The graphics card is overheating
D.The monitor's firmware is outdated
AnswerB

A cable not rated for the necessary DisplayPort version can cause signal dropouts at high resolutions.

Why this answer

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

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11
MCQmedium

A technician is setting up a new all-in-one PC for a reception desk. The PC has a touchscreen display. After installation, the touch function does not respond. The technician has verified that the display works and the OS is loaded. What should the technician check first?

A.Replace the touchscreen digitizer
B.Check if the touchscreen driver is installed in Device Manager
C.Clean the screen with a microfiber cloth
D.Disable and re-enable the touchscreen in BIOS
AnswerB

Missing or incorrect drivers are the most common cause of touchscreen non-functionality.

Why this answer

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

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12
MCQhard

A graphic designer wants to connect three 4K monitors to a single workstation for a video editing suite. The workstation has a graphics card with one HDMI 2.0 port, one DisplayPort 1.4, and one DVI-D port. The monitors all support HDMI and DisplayPort. Which configuration will allow all three monitors to display at 4K resolution simultaneously?

A.Connect one monitor via HDMI, one via DisplayPort, and one via DVI-D
B.Use a DisplayPort hub to connect all three monitors to the single DisplayPort
C.Connect one monitor via HDMI, one via DisplayPort, and use a DisplayPort-to-HDMI adapter for the third
D.Replace the graphics card with one that has three DisplayPorts
AnswerC

This uses all available ports with adapters, and both HDMI and DisplayPort support 4K, allowing three monitors.

Why this answer

DVI-D does not support 4K at 60Hz; it maxes out at 2560x1600. To run three 4K monitors, the technician must use adapters to convert DisplayPort to HDMI for the third monitor, as HDMI and DisplayPort both support 4K.

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13
MCQmedium

A user says their monitor suddenly turned off and will not power on. The power LED on the monitor is off. They have checked the power cable and it is securely connected. What should the technician do next?

A.Replace the monitor's internal power supply
B.Test the power outlet with a known-working device
C.Reseat the video cable connecting the monitor to the PC
D.Replace the monitor with a new one
AnswerB

This checks if the outlet is providing power, a common and simple cause.

Why this answer

If the power LED is off and the cable is secure, the next step is to test the power outlet with another device to rule out a dead outlet. This follows a logical troubleshooting process.

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14
MCQeasy

A customer reports that their laptop screen flickers intermittently, especially when they adjust the lid angle. The image is clear when the screen is at a specific angle but flickers or goes black at others. What is the most likely cause?

A.The LCD panel has a dead pixel
B.The display cable is loose or damaged
C.The video card driver is outdated
D.The inverter is failing
AnswerB

A loose or damaged cable in the hinge area causes intermittent contact, leading to flickering when the lid moves.

Why this answer

This scenario describes a classic symptom of a failing or loose display cable, which connects the motherboard to the LCD panel. The cable is often routed through the hinge, and movement causes intermittent contact. Replacing or reseating the cable usually resolves the issue.

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15
MCQmedium

A technician is installing a new video card in a desktop PC used for graphic design. The card has one HDMI port, one DisplayPort, and two DVI ports. The user wants to connect two 1920x1080 monitors. Which combination of ports and cables will provide the best image quality and support for both monitors?

A.Use the HDMI port for one monitor and a DVI port for the other
B.Use the HDMI port for one monitor and the DisplayPort for the other
C.Use both DVI ports for the monitors
D.Use a DisplayPort splitter to run both monitors from the single DisplayPort
AnswerB

Both are digital, support high resolutions, and are the best choices for image quality and compatibility.

Why this answer

HDMI and DisplayPort both support 1920x1080 at high quality and are digital, ensuring the best image. DVI is also digital but less common for modern monitors; using two digital connections is optimal.

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16
MCQeasy

A user complains that their external monitor shows a 'No Signal' message when connected to their laptop via HDMI. The laptop display works fine. You test the monitor with another computer and it works. What should you check first?

A.Replace the HDMI cable
B.Update the laptop's BIOS
C.Press the function key to switch display modes
D.Reinstall the graphics driver
AnswerC

Laptops often require pressing a function key (like F4 or F8) to enable external display output, which is the most straightforward first step.

Why this answer

Since the monitor works with another computer, the issue is likely with the laptop's output or settings. The most common cause is that the laptop is not set to output to the external display. Pressing the function key (e.g., F4 or F8) toggles display modes.

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17
MCQmedium

A technician is configuring a dual-monitor setup for a stock trader. The primary monitor is a 27-inch 1440p display connected via DisplayPort, and the secondary is a 24-inch 1080p display connected via HDMI. The user notices that windows dragged to the secondary monitor appear stretched. What is the most likely cause?

A.The HDMI cable is not version 2.0 or higher
B.The secondary monitor's resolution is set to 1440p instead of 1080p
C.The graphics card cannot support two different resolutions
D.The secondary monitor is set to extend mode instead of duplicate
AnswerB

If the 1080p monitor is set to a higher resolution, the OS scales it, causing stretching.

Why this answer

Mismatched resolutions cause scaling issues; the secondary monitor's native 1080p resolution should be set in display settings. Stretching occurs when the resolution is set incorrectly, not matching the monitor's native resolution.

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18
MCQhard

A user reports that their 4K monitor connected via DisplayPort 1.2 only shows a 30Hz refresh rate at native resolution, causing mouse movement to feel laggy. The monitor supports 60Hz at 4K. What is the most likely cause?

A.The monitor's firmware is outdated
B.The graphics card does not support 4K at 60Hz
C.The DisplayPort cable is only rated for DisplayPort 1.1
D.The monitor's refresh rate is set to 30Hz in the display settings
AnswerC

DP 1.1 cables cannot handle the bandwidth for 4K 60Hz, forcing 30Hz.

Why this answer

DisplayPort 1.2 can support 4K at 60Hz, but the cable must be rated for that bandwidth. A cable that only meets DP 1.1 standards will limit the refresh rate. This tests knowledge of cable bandwidth limitations.

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19
MCQeasy

A customer reports that their external monitor connected via HDMI flickers intermittently. They have tried a different HDMI cable and a different monitor, but the issue persists. The laptop display works fine. Which component is most likely causing the problem?

A.The laptop's graphics driver
B.The HDMI cable
C.The external monitor
D.The laptop's HDMI port
AnswerD

Since the internal display works and swapping cable/monitor didn't help, the HDMI port is the remaining variable.

Why this answer

The HDMI port on the laptop is the most likely cause because the issue follows the laptop, not the cable or monitor. This tests the ability to isolate a faulty display output port through process of elimination.

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20
MCQmedium

A technician is setting up a dual-monitor configuration for a financial analyst who needs to see many columns of data side by side. The user wants the sharpest possible text and the highest pixel density. Which type of display panel should the technician recommend?

A.TN (Twisted Nematic) panel
B.IPS (In-Plane Switching) panel
C.VA (Vertical Alignment) panel
D.OLED (Organic Light Emitting Diode) panel
AnswerB

IPS panels provide excellent color accuracy, wide viewing angles, and consistent brightness, which are ideal for sharp text and data analysis.

Why this answer

IPS (In-Plane Switching) panels offer superior color accuracy and wide viewing angles, but for sharp text and high pixel density, the resolution is the key factor. However, among panel types, IPS provides better image quality for text work than TN, though VA offers good contrast. The correct answer here is IPS for overall sharpness and consistency.

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21
MCQeasy

A customer wants to connect a laptop to a 4K TV for a presentation. The laptop has an HDMI 1.4 port, and the TV supports HDMI 2.0. What is the maximum resolution and refresh rate the customer can expect?

A.4K at 60Hz
B.1080p at 120Hz
C.4K at 30Hz
D.1440p at 60Hz
AnswerC

HDMI 1.4 is limited to 4K at 30Hz, so this is the maximum the laptop can output.

Why this answer

HDMI 1.4 supports 4K resolution at 30Hz, while HDMI 2.0 supports 4K at 60Hz. The bottleneck is the laptop's HDMI 1.4 port, so the output will be limited to 4K at 30Hz.

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22
MCQhard

A technician is troubleshooting a desktop PC that displays a blank screen on boot. The monitor's power LED is on (green), but no image appears. The PC beeps once during startup, and the hard drive activity light flashes. Which component is most likely faulty?

A.The CPU
B.The RAM
C.The video card
D.The monitor's power supply
AnswerC

With POST passed and no display, the video card or its connection is the most likely fault.

Why this answer

A single beep usually indicates a successful POST, meaning the CPU and RAM are working. The blank screen with no image suggests the video card or its connection is failing, as the monitor is receiving power.

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23
MCQmedium

A user's laptop screen has a small crack in the corner, and the display shows lines and discoloration in that area. The rest of the screen works. What is the most cost-effective solution?

A.Replace the entire laptop.
B.Replace the LCD panel.
C.Replace the display cable.
D.Use an external monitor permanently.
AnswerB

A cracked LCD panel requires replacement of the panel itself, which is the standard repair.

Why this answer

A cracked LCD panel requires replacement of the entire screen assembly, not just the glass. Replacing the whole LCD panel is the standard and most cost-effective repair for this type of physical damage.

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24
MCQeasy

A technician is installing a new LCD monitor for a user who does photo editing. The user complains that colors appear washed out compared to their old CRT monitor. What should the technician adjust first?

A.Replace the video cable with a DVI cable.
B.Update the graphics driver.
C.Adjust the color settings in the monitor's on-screen display.
D.Set the resolution to the monitor's native resolution.
AnswerC

Adjusting color settings like brightness, contrast, and color temperature can correct washed-out colors.

Why this answer

LCD monitors often have different color gamuts and settings than CRTs. The most straightforward fix is to adjust the color calibration settings in the monitor's OSD or OS to improve color accuracy.

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25
MCQhard

A user's all-in-one PC has a touchscreen that is not responding correctly. The technician calibrates the touchscreen, but the issue persists. The technician then notices that the screen is slightly misaligned with the bezel. What is the most likely cause?

A.The touchscreen driver is corrupted.
B.The digitizer is failing.
C.The LCD panel has shifted inside the chassis.
D.The operating system needs a touchscreen firmware update.
AnswerC

A physical shift of the LCD panel causes the touch coordinates to be offset from the display, which calibration cannot correct.

Why this answer

A misaligned screen relative to the bezel suggests that the LCD panel has shifted inside the chassis. This physical misalignment can cause the touch sensor to be out of sync with the display, leading to touch inaccuracies that calibration cannot fix.

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26
MCQmedium

A customer wants to use a 34-inch ultrawide monitor (3440x1440) with their desktop PC. The PC has an older GPU with a DVI-D dual-link port and an HDMI 1.4 port. Which connection should the technician recommend for the best image quality?

A.DVI-D dual-link
B.HDMI 1.4
C.VGA
D.DisplayPort
AnswerB

HDMI 1.4 supports 3440x1440 at 60Hz, making it a suitable choice for this ultrawide monitor.

Why this answer

3440x1440 at 60Hz requires significant bandwidth. HDMI 1.4 can support this resolution at 60Hz, but DVI-D dual-link can also handle it. However, HDMI is generally preferred for modern monitors, and DVI-D dual-link is less common.

The correct answer is HDMI 1.4, as it can support the resolution and is more versatile.

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27
MCQeasy

A user's laptop screen flickers intermittently, but the external monitor works fine. What is the most likely cause?

A.The graphics driver is outdated.
B.The LCD panel is failing.
C.The inverter or backlight is failing.
D.The display cable connecting the motherboard to the screen is loose or damaged.
AnswerD

A loose or damaged display cable can cause intermittent flickering on the internal screen while the external monitor remains unaffected.

Why this answer

Since the external monitor works fine, the issue is likely with the laptop's display components. A loose or failing display cable is a common cause of intermittent flickering on built-in screens.

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28
MCQmedium

A technician is configuring a new all-in-one PC for a graphic designer. The designer needs to calibrate the display for accurate color reproduction. Which technology should the technician ensure the monitor supports?

A.TN panel with 144Hz refresh rate
B.IPS panel with high color gamut
C.VA panel with high contrast ratio
D.OLED panel with burn-in protection
AnswerB

IPS panels provide excellent color accuracy and wide viewing angles, essential for graphic design calibration.

Why this answer

Color calibration is essential for graphic design work. IPS panels are known for wide color gamuts and consistent color reproduction, making them ideal for this task. TN and VA panels have limitations in color accuracy and viewing angles.

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29
MCQhard

A user complains that their external monitor connected via VGA shows a slightly blurry image with faint horizontal lines. The monitor works perfectly with another computer using the same VGA cable. What is the most likely cause?

A.The monitor's resolution is set too high for VGA
B.There is a ground loop between the computer and monitor
C.The VGA port on the computer has bent pins
D.The graphics driver is corrupt
AnswerB

A ground loop can cause interference in analog VGA signals, resulting in blurriness and horizontal lines.

Why this answer

VGA is an analog signal, and blurry images with horizontal lines often indicate interference or a ground loop issue. Since the monitor and cable work elsewhere, the problem is likely with the computer's VGA output or electrical interference from the computer's power supply. A ground loop can introduce noise into the analog signal.

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30
MCQeasy

A user complains that text on their new 27-inch 4K monitor appears very small and hard to read. The display is set to its native resolution. What is the most effective way to make text readable without sacrificing image quality?

A.Reduce the screen resolution to 1920x1080
B.Increase the display scaling percentage in OS settings
C.Replace the monitor with a lower-resolution model
D.Adjust the monitor's physical sharpness setting
AnswerB

Scaling enlarges text and UI while keeping native resolution, maintaining clarity.

Why this answer

Adjusting the display scaling in the operating system increases the size of text and UI elements while keeping the native resolution, preserving sharpness. Lowering resolution would make text larger but blurry.

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