The answer is a tone generator and probe. This tool is correct because when the link light on the NIC is off and a known-good patch cable fails to restore connectivity, the fault likely lies in the wall jack’s wiring or its termination at the patch panel; a tone generator sends a signal down the specific cable pair, and the probe detects that tone at the other end, allowing the technician to trace the exact cable path and verify continuity without relying on network activity. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your ability to distinguish between cable testing tools—a common trap is choosing a cable tester or multimeter, but those check for shorts or voltage, not cable tracing. Remember the mnemonic “Tone for Trace”: if you need to find which cable goes where, reach for the tone generator and probe.
220-1101 Networking Tools Practice Question
This 220-1201 practice question tests your understanding of networking tools. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 user reports that their wired desktop cannot connect to the network. The technician verifies the link light on the computer's NIC is off. Using a known-good patch cable does not resolve the issue. Which tool should be used to test the wall jack's wiring?
Why wrong: A cable tester could verify the wall jack's wiring, but without knowing which cable corresponds to which port at the patch panel, tracing is needed first.
B
Tone generator and probe
This tool set allows the technician to identify the specific cable at the patch panel and then test continuity, making it ideal for this scenario.
C
Loopback plug
Why wrong: A loopback plug tests the NIC itself, but the NIC's link light is off, and the issue is likely beyond the computer.
D
Multimeter
Why wrong: A multimeter can check for shorts but is not designed for tracing cables or verifying network wiring standards.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Tone generator and probe
A tone generator and probe allow a technician to trace the wall jack back to the patch panel and verify continuity. Since the link light is off and a known-good cable didn't help, the issue may be in the wall jack or its termination, and tracing the cable is the next step.
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 could verify the wall jack's wiring, but without knowing which cable corresponds to which port at the patch panel, tracing is needed first.
✓
Tone generator and probe
Why this is correct
This tool set allows the technician to identify the specific cable at the patch panel and then test continuity, making it ideal for this scenario.
Related concept
Static NAT maps one inside address to one outside address.
✗
Loopback plug
Why it's wrong here
A loopback plug tests the NIC itself, but the NIC's link light is off, and the issue is likely beyond the computer.
✗
Multimeter
Why it's wrong here
A multimeter can check for shorts but is not designed for tracing cables or verifying network wiring standards.
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: Tone generator and probe — A tone generator and probe allow a technician to trace the wall jack back to the patch panel and verify continuity. Since the link light is off and a known-good cable didn't help, the issue may be in the wall jack or its termination, and tracing the cable is the next step.
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.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. During a network upgrade, a technician needs to document the physical path a cable takes from a workstation to the patch panel in the server room. Which tool is specifically designed to trace the exact cable route through walls and ceilings?
easy
A.Cable tester
✓ B.Toner and probe
C.Crimper
D.Punch-down tool
Why B: A toner and probe set is the standard tool for tracing individual cables among many. The toner generates a signal on the wire, and the probe emits an audible tone when near the correct cable. Cable testers check continuity, crimpers attach connectors, and punch-down tools terminate cables—none trace routes.
Last reviewed: Jun 18, 2026
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