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220-1201 · Question #249

A technician is troubleshooting a laptop's connectivity via its USB-C port to a projector. The same laptop works well when it is connected to a USB-C docking station. The projector is configured as…

The correct answer is B. The USB-C cable is not compatible with Thunderbolt technology. Not all USB-C cables support video output (DisplayPort Alt Mode) or Thunderbolt, even though they carry power. A charge-only USB-C cable will work for charging tests but won’t pass the video signal to the projector. You need a USB-C cable rated for Thunderbolt or DisplayPort…

Submitted by wei.xz· Mar 30, 2026Hardware and Network Troubleshooting

Question

A technician is troubleshooting a laptop's connectivity via its USB-C port to a projector. The same laptop works well when it is connected to a USB-C docking station. The projector is configured as expected, and the USB-C cable was tested on a charging port. Which of the following could be the issue?

Options

  • AThe USB-C cable requires a power injector
  • BThe USB-C cable is not compatible with Thunderbolt technology.
  • CThe USB-C cable needs an adapter to work with the laptop.
  • DThe USB-C cable does not support enough power.

How the community answered

(33 responses)
  • A
    21% (7)
  • B
    61% (20)
  • C
    12% (4)
  • D
    6% (2)

Explanation

Not all USB-C cables support video output (DisplayPort Alt Mode) or Thunderbolt, even though they carry power. A charge-only USB-C cable will work for charging tests but won’t pass the video signal to the projector. You need a USB-C cable rated for Thunderbolt or DisplayPort Alt Mode to transmit the display data directly.

Topics

#USB-C#Thunderbolt#Video output#Troubleshooting connectivity

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