The answer is a PoE tester, because it is the dedicated tool designed to verify that power is being delivered over an Ethernet cable. Unlike a standard cable tester, which only checks for continuity and wiring faults, a PoE tester actively detects the presence of voltage on the pairs used for Power over Ethernet and can report the power class and voltage level, ensuring the VoIP phone will receive sufficient power to operate. On the CompTIA A+ Core 1 220-1201 exam, this question tests your ability to select the correct tool for a specific networking task, and a common trap is confusing a PoE tester with a multimeter—while a multimeter can measure voltage if you know the correct pins, it is less safe and more complex for this job. Remember the memory tip: “PoE tester for power, cable tester for pairs.”
220-1201 Networking Tools Practice Question
This 220-1201 practice question tests your understanding of networking tools. 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 deploying a new VoIP phone and needs to ensure the Ethernet cable connecting the phone to the wall jack provides sufficient power for the phone to operate. The network switch supports Power over Ethernet (PoE). Which tool can verify that PoE is active on the cable?
Why wrong: A multimeter can measure voltage on the Ethernet pins, but it requires knowledge of which pins carry PoE and careful probing, making it less straightforward than a dedicated PoE tester.
B
PoE tester
A PoE tester is designed to verify the presence and type of PoE on a cable, providing clear indication of power delivery.
C
Cable tester
Why wrong: A standard cable tester checks wiring continuity and pinout, not the presence of power.
D
Loopback plug
Why wrong: A loopback plug is used to test the network interface card, not to detect PoE.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
PoE tester
A PoE tester specifically detects whether power is being delivered over the Ethernet cable and can indicate the voltage and power class. A multimeter can measure voltage if you know which pins to test, but a PoE tester is simpler and safer. A cable tester checks continuity, and a loopback plug tests NIC functionality.
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.
✗
Multimeter
Why it's wrong here
A multimeter can measure voltage on the Ethernet pins, but it requires knowledge of which pins carry PoE and careful probing, making it less straightforward than a dedicated PoE tester.
✓
PoE tester
Why this is correct
A PoE tester is designed to verify the presence and type of PoE on a cable, providing clear indication of power delivery.
Related concept
Read the scenario before looking for a memorised answer.
✗
Cable tester
Why it's wrong here
A standard cable tester checks wiring continuity and pinout, not the presence of power.
✗
Loopback plug
Why it's wrong here
A loopback plug is used to test the network interface card, not to detect PoE.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Networking Tools — This question tests Networking Tools — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: PoE tester — A PoE tester specifically detects whether power is being delivered over the Ethernet cable and can indicate the voltage and power class. A multimeter can measure voltage if you know which pins to test, but a PoE tester is simpler and safer. A cable tester checks continuity, and a loopback plug tests NIC functionality.
What should I do if I get this 220-1201 question wrong?
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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