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220-1201 Practice Question: A user wants to connect a laptop to a 4K…
A user wants to connect a laptop to a 4K projector for a presentation. The laptop has a USB-C port that supports DisplayPort Alt Mode, and the projector has an HDMI input. Which cable or adapter is required?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
USB-C to HDMI adapter or cable
USB-C to HDMI cables or adapters are designed for this exact scenario when the USB-C port supports DisplayPort Alt Mode. This tests understanding of USB-C Alt Mode and the need for compatible cables.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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USB-C to USB-C cable
Why it's wrong here
This cable is designed for connecting two USB-C devices, typically for data transfer, charging, or native USB-C video output. However, the projector in this scenario only features an HDMI input, which is a different physical connector and signal standard. Therefore, a direct USB-C to USB-C cable cannot physically plug into the projector's HDMI port, nor would it provide the necessary HDMI video signal without an intermediate adapter.
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HDMI to HDMI cable
Why it's wrong here
An HDMI to HDMI cable requires both the source device (laptop) and the destination device (projector) to have native HDMI ports for direct connection. While the projector has an HDMI input, the laptop in this specific scenario only provides a USB-C output, not a dedicated HDMI port. Consequently, this cable cannot establish a physical connection to the laptop, rendering it incompatible for direct video transmission.
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USB-C to HDMI adapter or cable
Why this is correct
This is the correct solution because modern USB-C ports often support DisplayPort Alternate Mode (Alt Mode), which allows them to output video signals. A USB-C to HDMI adapter or cable actively converts the DisplayPort Alt Mode signal from the laptop's USB-C port into a standard HDMI signal. This enables seamless video transmission to the projector's HDMI input, effectively bridging the differing port types and signal protocols.
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DisplayPort to HDMI cable
Why it's wrong here
While DisplayPort is a common digital video interface, the laptop specifically has a USB-C port, not a dedicated DisplayPort output. Although a USB-C port can carry DisplayPort signals via Alt Mode, a direct DisplayPort to HDMI cable requires a native DisplayPort connector on the source device. Thus, this cable cannot physically connect to the laptop's USB-C port, making it an unsuitable choice for this setup.
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