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.”
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.
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?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Toner probe
This question assesses understanding of cable identification tools. A toner probe emits a tone that can be traced along a cable, allowing you to locate the correct cable at the patch panel without disrupting service.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Static NAT maps one inside address to one outside address.
✗
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: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 220-1201 NAT questions on configuration and troubleshooting.
Networking Tools — This question tests Networking Tools — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Toner probe — This question assesses understanding of cable identification tools. A toner probe emits a tone that can be traced along a cable, allowing you to locate the correct cable at the patch panel without disrupting service.
What should I do if I get this 220-1201 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 220-1201 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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