- A
Cable tester
Why wrong: A cable tester checks connectivity and faults but does not help identify which cable goes to which jack without disconnecting.
- B
Toner probe
A toner probe generates a tone on the cable that can be detected with a probe, enabling identification of the correct cable at the patch panel.
- C
Multimeter
Why wrong: A multimeter measures electrical properties and is not designed for tracing cables in a network environment.
- D
Loopback plug
Why wrong: A loopback plug tests network interfaces but cannot identify cables in a patch panel.
Question 972 of 1,020
Toner Probe: Locate the Correct Cable in a Messy Patch Panel
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.
During a network upgrade, you need to identify which cable in a messy patch panel corresponds to a specific office wall jack. The cables are not labeled. Which tool should you use?
Quick Answer
The answer is a toner probe. This tool is the correct choice because it consists of two parts: a tone generator that sends an electrical signal along the specific cable from the office wall jack, and a probe that detects that tone at the patch panel, allowing you to physically trace the cable even when it is tangled or unlabeled. On the CompTIA A+ Core 1 220-1201 exam, this question tests your ability to select the right tool for cable identification without disrupting active network traffic, a common scenario in messy patch panel troubleshooting. A frequent trap is confusing the toner probe with a cable tester, which checks continuity or wiring faults but cannot identify which cable goes where in a bundle. For a quick memory tip, remember that a toner probe “sings” its way to the right cable, so think “tone to trace.”
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
✓
Toner probe
A toner probe (inductive amplifier and tone generator) is the correct tool for tracing an unlabeled cable from a patch panel to a specific wall jack. The tone generator injects a distinctive audio signal onto the wire pair, and the inductive probe detects that signal without requiring a direct electrical connection, allowing you to identify the correct cable even in a dense, messy bundle.
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.
- ✗
Cable tester
Why it's wrong here
A cable tester checks connectivity and faults but does not help identify which cable goes to which jack without disconnecting.
- ✓
Toner probe
Why this is correct
A toner probe generates a tone on the cable that can be detected with a probe, enabling identification of the correct cable at the patch panel.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Multimeter
Why it's wrong here
A multimeter measures electrical properties and is not designed for tracing cables in a network environment.
- ✗
Loopback plug
Why it's wrong here
A loopback plug tests network interfaces but cannot identify cables in a patch panel.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common mistake on the CompTIA A+ exam is confusing a cable tester with a toner probe. The cable tester checks electrical continuity and wiring faults, not physical location, so candidates often incorrectly choose it for cable identification tasks.
Detailed technical explanation
How to think about this question
A toner probe works by coupling an AC signal (typically 1–2 kHz) onto the conductor via a tone generator; the inductive probe picks up the electromagnetic field radiated by that signal, even through insulation or patch panel ports. In real-world scenarios, technicians often use a 'fox and hound' pair where the tone generator connects to the wall jack using a modular adapter, and the probe is swept across the patch panel until the audible tone peaks, confirming the exact cable. This method is non-destructive and works on live or dead circuits, though it cannot verify data integrity.
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.
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FAQ
Questions learners often ask
What does this 220-1201 question test?
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: Toner probe — A toner probe (inductive amplifier and tone generator) is the correct tool for tracing an unlabeled cable from a patch panel to a specific wall jack. The tone generator injects a distinctive audio signal onto the wire pair, and the inductive probe detects that signal without requiring a direct electrical connection, allowing you to identify the correct cable even in a dense, messy bundle.
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.
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Last reviewed: Jul 4, 2026
This 220-1201 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1201 exam.
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