Quick Answer
The answer is ping -t 1 192.168.1.1, because this command forces ICMP packets to expire after a single hop by setting the Time-to-Live (TTL) value to 1. In a network loop, the packet circulates endlessly, and each router decrements the TTL; when it reaches zero, the router discards the packet and returns an ICMP Time Exceeded message. By observing repeated Time Exceeded responses from the same or multiple IP addresses, you can detect a network loop using ping TTL. On the CompTIA ITF+ FC0-U61 exam, this tests your understanding of how TTL prevents infinite packet forwarding and how to interpret ICMP error messages as diagnostic clues. A common trap is confusing a normal timeout with a loop—remember that a loop produces consistent, rapid Time Exceeded replies, not silence. For a memory tip, think “TTL of 1, loop is done”—if you see the same router complaining repeatedly, you’ve found the cycle.
This FC0-U61 practice question tests your understanding of it concepts and terminology. 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 technician is troubleshooting a slow network and suspects a loop. Which command-line tool should the technician use to identify the loop?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
tracert example.com
Why wrong: Tracert shows the path to a destination, but may not directly indicate a loop without analysis.
netstat -a
Why wrong: Netstat shows active connections, not loops.
ping -t 1 192.168.1.1
Ping with a TTL of 1 will fail if there is a loop, and multiple 'Time Exceeded' messages can indicate a loop.
nslookup example.com
Why wrong: Nslookup is for DNS queries, not network loops.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ping -t 1 192.168.1.1
Option C is correct because the `ping -t 1 192.168.1.1` command sends ICMP echo requests with a Time-to-Live (TTL) value of 1. If a network loop exists, the packet will be forwarded in a cycle, and each hop decrements the TTL. When the TTL reaches 0, the router discards the packet and sends an ICMP Time Exceeded message back. By observing repeated Time Exceeded responses from the same or multiple IPs, the technician can identify the loop's location.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
tracert example.com
Why it's wrong here
Tracert shows the path to a destination, but may not directly indicate a loop without analysis.
netstat -a
Why it's wrong here
Netstat shows active connections, not loops.
ping -t 1 192.168.1.1
Why this is correct
Ping with a TTL of 1 will fail if there is a loop, and multiple 'Time Exceeded' messages can indicate a loop.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
nslookup example.com
Why it's wrong here
Nslookup is for DNS queries, not network loops.
Common exam traps
The trap here is that candidates often confuse `ping -t` (continuous ping) with `tracert` (trace route), thinking that `tracert` is the standard tool for loop detection, but `tracert` is designed for path discovery, not for actively triggering TTL expiration in a loop scenario.
Trap categories for this question
Command / output trap
Tracert shows the path to a destination, but may not directly indicate a loop without analysis.
Detailed technical explanation
The ICMP Time Exceeded message (Type 11, Code 0) is generated when a router decrements the TTL to 0. In a loop, the same packet may repeatedly trigger this message from the same router or from different routers in the cycle, creating a pattern of identical source IPs in the responses. A technician can use `ping -t 1` to a local gateway; if the loop is between the source and that gateway, the TTL will expire at the loop's first router, and the repeated responses from that router confirm the loop. This technique is often used in small networks where STP (Spanning Tree Protocol) is not enabled or has failed.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the FC0-U61 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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
IT Concepts and Terminology — This question tests IT Concepts and Terminology — Read the scenario before looking for a memorised answer..
The correct answer is: ping -t 1 192.168.1.1 — Option C is correct because the `ping -t 1 192.168.1.1` command sends ICMP echo requests with a Time-to-Live (TTL) value of 1. If a network loop exists, the packet will be forwarded in a cycle, and each hop decrements the TTL. When the TTL reaches 0, the router discards the packet and sends an ICMP Time Exceeded message back. By observing repeated Time Exceeded responses from the same or multiple IPs, the technician can identify the loop's location.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This FC0-U61 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 FC0-U61 exam.
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