The answer is traceroute (or tracert on Windows), because it is the only tool that maps the full Layer 3 path and measures round-trip time per hop. When ping shows intermittent failures and high latency to the default gateway, traceroute sends packets with incrementing Time-to-Live (TTL) values to force each router along the path to reply, revealing exactly which hop is introducing delay or dropping packets. On the CompTIA Network+ N10-009 exam, this scenario tests your ability to differentiate between tools like ping, pathping, and traceroute—a common trap is choosing ping alone, which only tests end-to-end reachability without isolating the problematic hop. Remember that traceroute’s TTL-based hop-by-hop analysis is what makes it the go-to for pinpointing high-latency hops in network troubleshooting. Memory tip: think “TTL tells the tale”—each hop’s TTL decrement reveals the exact router causing the trouble.
N10-009 Network Troubleshooting Practice Question
This N10-009 practice question tests your understanding of network troubleshooting. 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 user reports intermittent connectivity issues. The technician runs ping tests and notices that pings to the default gateway sometimes fail and sometimes succeed. While pinging, the technician observes that some replies have high latency. Which tool should the technician use to analyze the path and identify where packets are being delayed?
Traceroute sends packets with increasing TTL values to map the path and measure latency at each hop, useful for identifying where delays or failures occur.
B
nslookup
Why wrong: Nslookup is used to query DNS servers for hostname resolution, not for path analysis or latency measurement.
C
ipconfig
Why wrong: Ipconfig displays local TCP/IP configuration, such as IP address and DNS settings, but does not analyze network paths.
D
arp
Why wrong: Arp shows the IP-to-MAC address mappings on the local network; it does not provide path or latency information.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
traceroute / tracert
Traceroute (tracert on Windows) is the correct tool because it sends packets with incrementing Time-to-Live (TTL) values to map the entire Layer 3 path from source to destination. By measuring the round-trip time (RTT) for each hop, it can pinpoint exactly which router or link is introducing high latency or packet loss, addressing the intermittent connectivity and delayed replies observed in the ping tests.
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.
✓
traceroute / tracert
Why this is correct
Traceroute sends packets with increasing TTL values to map the path and measure latency at each hop, useful for identifying where delays or failures occur.
Related concept
Read the scenario before looking for a memorised answer.
✗
nslookup
Why it's wrong here
Nslookup is used to query DNS servers for hostname resolution, not for path analysis or latency measurement.
✗
ipconfig
Why it's wrong here
Ipconfig displays local TCP/IP configuration, such as IP address and DNS settings, but does not analyze network paths.
✗
arp
Why it's wrong here
Arp shows the IP-to-MAC address mappings on the local network; it does not provide path or latency information.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests that candidates confuse ping (which only tests end-to-end reachability and latency) with traceroute (which isolates the problematic hop), leading them to overlook traceroute when the question explicitly asks for path analysis.
Trap categories for this question
Command / output trap
Arp shows the IP-to-MAC address mappings on the local network; it does not provide path or latency information.
Detailed technical explanation
How to think about this question
Traceroute works by sending UDP packets (or ICMP echo requests on Windows) with TTL=1 to the first hop, which decrements the TTL to 0 and returns an ICMP Time Exceeded message; the source then sends a packet with TTL=2, and so on. Each hop's response time reveals latency, and missing replies (asterisks) can indicate a router that does not respond or a firewall blocking ICMP. In real-world scenarios, asymmetric routing can cause traceroute to show different paths for forward and reverse traffic, so technicians often run traceroutes from both endpoints to fully diagnose asymmetric latency issues.
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 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 N10-009 question in full detail.
Network Troubleshooting — This question tests Network Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: traceroute / tracert — Traceroute (tracert on Windows) is the correct tool because it sends packets with incrementing Time-to-Live (TTL) values to map the entire Layer 3 path from source to destination. By measuring the round-trip time (RTT) for each hop, it can pinpoint exactly which router or link is introducing high latency or packet loss, addressing the intermittent connectivity and delayed replies observed in the ping tests.
What should I do if I get this N10-009 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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