- A
A USB-C to dual HDMI adapter
Why wrong: This adapter may output video but lacks Ethernet and power delivery, requiring additional accessories.
- B
A Thunderbolt 3 docking station
Thunderbolt 3 docks offer high bandwidth, dual 4K support, Ethernet, and power delivery, meeting all requirements.
- C
A USB 3.0 hub with HDMI and Ethernet
Why wrong: USB 3.0 hubs have limited bandwidth (5 Gbps) and may not support dual 4K monitors at full resolution.
- D
A KVM switch
Why wrong: A KVM switch allows controlling multiple computers but does not add ports or power delivery to a single laptop.
Question 774 of 1,020
220-1201 Mobile Device Accessories Practice Question
This 220-1201 practice question tests your understanding of mobile device accessories. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A technician is setting up a mobile workstation for a graphic designer who uses a laptop with a USB-C port that supports Thunderbolt 3. The designer needs to connect two 4K monitors, a wired Ethernet connection, and charge the laptop simultaneously. Which accessory should the technician choose?
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
✓
A Thunderbolt 3 docking station
A Thunderbolt 3 docking station is the correct choice because it provides sufficient bandwidth (up to 40 Gbps) to drive two 4K monitors simultaneously, includes a dedicated Ethernet port for wired networking, and delivers power delivery (PD) to charge the laptop—all through a single USB-C connection that is backward-compatible with Thunderbolt 3.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A USB-C to dual HDMI adapter
Why it's wrong here
This adapter may output video but lacks Ethernet and power delivery, requiring additional accessories.
- ✓
A Thunderbolt 3 docking station
Why this is correct
Thunderbolt 3 docks offer high bandwidth, dual 4K support, Ethernet, and power delivery, meeting all requirements.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A USB 3.0 hub with HDMI and Ethernet
Why it's wrong here
USB 3.0 hubs have limited bandwidth (5 Gbps) and may not support dual 4K monitors at full resolution.
- ✗
A KVM switch
Why it's wrong here
A KVM switch allows controlling multiple computers but does not add ports or power delivery to a single laptop.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the misconception that any USB-C adapter or hub can support dual 4K displays and charging, but only a Thunderbolt 3 docking station provides the necessary bandwidth and power delivery capabilities for this specific combination of requirements.
Trap categories for this question
Command / output trap
This adapter may output video but lacks Ethernet and power delivery, requiring additional accessories.
Detailed technical explanation
How to think about this question
Thunderbolt 3 combines PCIe, DisplayPort, and USB protocols into a single interface, allowing daisy-chaining of multiple 4K displays via DisplayPort 1.2 or 1.4. The docking station uses the laptop's Thunderbolt 3 controller to negotiate power delivery (up to 100 W) and allocate bandwidth dynamically, ensuring both monitors receive full 4K resolution at 60 Hz while maintaining a stable Ethernet connection. In real-world scenarios, a graphic designer might also connect external storage via the dock, leveraging the 40 Gbps throughput for fast file transfers.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Mobile Device Accessories — study guide chapter
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Mobile Device Accessories — This question tests Mobile Device Accessories — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A Thunderbolt 3 docking station — A Thunderbolt 3 docking station is the correct choice because it provides sufficient bandwidth (up to 40 Gbps) to drive two 4K monitors simultaneously, includes a dedicated Ethernet port for wired networking, and delivers power delivery (PD) to charge the laptop—all through a single USB-C connection that is backward-compatible with Thunderbolt 3.
What should I do if I get this 220-1201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
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