Free CompTIA Network+ N10-009 Network Troubleshooting & Tools Practice Test 2026 — CompTIA Network+ (N10-009) Questions

This free CompTIA Network+ N10-009 Network Troubleshooting & Tools practice test covers Net+ Domain 5 (~19%) — network troubleshooting and tools, covering CompTIA methodology, hardware tools, command-line tools, and cable/wireless issues. Each question includes a detailed explanation aligned to the N10-009 exam objectives — perfect for Network+ exam prep.

Key Topics in CompTIA Network+ N10-009 Network Troubleshooting & Tools

6 Free CompTIA Network+ N10-009 Network Troubleshooting & Tools Practice Questions with Answers

Sample Question 1 — Network Troubleshooting and Tools

You are troubleshooting a network connectivity issue where a user cannot access the internet. The user's IP address is 192.168.1.10/24, and their gateway is set to 192.168.1.1. You can ping the gateway, but cannot ping 8.8.8.8. What is the most likely cause?

  1. A. The user's subnet mask is incorrect.
  2. B. The DNS server is unreachable.
  3. C. The gateway's routing table is missing a default route. (Correct answer)
  4. D. The user's IP address is in conflict with another device.

Correct answer: C

Explanation: Since you can ping the gateway but not an external IP, it indicates that the gateway does not have a route to the internet. This is likely due to a missing default route in the gateway's routing table.

Sample Question 2 — Network Troubleshooting and Tools

A network administrator is using a cable tester to diagnose a network issue. The tester shows a 'split pair' error for a particular cable. What does this indicate?

  1. A. The cable length exceeds the maximum allowed distance.
  2. B. Two wires in the cable are crossed. (Correct answer)
  3. C. The cable is not properly terminated.
  4. D. The cable has a break in one of the pairs.

Correct answer: B

Explanation: A 'split pair' error occurs when two wires in a twisted pair cable are crossed, causing crosstalk and signal degradation. This often happens when the cable is not terminated correctly.

Sample Question 3 — Network Troubleshooting and Tools

During peak hours, users report slow network performance. You suspect a broadcast storm. Which tool would you use to confirm this diagnosis?

  1. A. Packet sniffer
  2. B. Cable tester
  3. C. Throughput tester
  4. D. Protocol analyzer (Correct answer)

Correct answer: D

Explanation: A protocol analyzer can be used to capture and analyze network traffic, allowing you to identify excessive broadcast traffic indicative of a broadcast storm.

Sample Question 4 — Network Troubleshooting and Tools

You are analyzing logs from a network switch and notice multiple MAC addresses associated with a single port. What could be a possible reason for this?

  1. A. The port is configured as an access port.
  2. B. The port is experiencing a loopback issue.
  3. C. The port is connected to another switch or hub. (Correct answer)
  4. D. The port is malfunctioning.

Correct answer: C

Explanation: Multiple MAC addresses on a single port typically suggest that the port is connected to another switch or hub, which is aggregating traffic from multiple devices.

Sample Question 5 — Network Troubleshooting and Tools

A technician is using the 'traceroute' command and sees that the trace stops at the third hop. What is the most likely cause of this issue?

  1. A. The destination server is down.
  2. B. An intermediate router is blocking ICMP traffic. (Correct answer)
  3. C. The local router has a misconfigured ACL.
  4. D. The network cable is faulty.

Correct answer: B

Explanation: If the traceroute stops at a specific hop, it is likely because an intermediate router is configured to block ICMP traffic, preventing further hops from being displayed.

Sample Question 6 — Network Troubleshooting and Tools

A network technician is troubleshooting a slow network connection and suspects high latency. Which tool can best help verify this issue?

  1. A. Ping (Correct answer)
  2. B. Netstat
  3. C. Nmap
  4. D. IPconfig

Correct answer: A

Explanation: The 'ping' command can be used to measure the round-trip time for packets sent to a destination, which helps in identifying high latency in the network.

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