20+ practice questions focused on Network Troubleshooting — one of the most tested topics on the CompTIA Network+ N10-009 exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Network Troubleshooting PracticeA user reports that they cannot access an internal web server at http://intranet.company.local but can access other internet websites. The technician runs ping intranet.company.local and receives replies successfully. Which tool should the technician use next to isolate the issue?
Explanation: The current explanation states that a successful `ping intranet.company.local` points to a name resolution failure. This is incorrect. If `ping intranet.company.local` receives replies successfully, it means the hostname *did* resolve to an IP address, and the server is reachable via ICMP. Therefore, name resolution is not the problem. The issue is more likely related to the web server service not running, a firewall blocking HTTP/HTTPS traffic to the server, or the hostname resolving to an *incorrect* IP address (though the explanation explicitly states 'failure' rather than 'incorrect resolution'). `nslookup` would only be the next step if the `ping` command failed to resolve the hostname or if the technician suspected an incorrect IP resolution despite successful ping.
A technician is troubleshooting a failed ping to a specific website's IP address. The user can browse other websites without issue, and nslookup on the user's workstation returns the correct IP address for the website. Which of the following is the most likely cause?
Explanation: The most likely cause is that the website server is blocking ICMP echo request (ping) traffic. Many servers and firewalls block ICMP for security while still allowing HTTP/HTTPS traffic, so a failed ping does not mean the website is down. Because other websites are reachable and DNS resolved correctly, the default gateway, DNS, and subnet mask are unlikely to be the problem.
A user can access a website by its IP address (e.g., 203.0.113.5) but cannot access it by its domain name (example.com). Other users on the same subnet can access the website by domain name. Which of the following should the technician check FIRST?
Explanation: The issue is isolated to a single user who can reach the website by IP but not by domain name, while other users on the same subnet have no problem. This indicates a client-side DNS resolution problem. The first thing to check is the local hosts file (e.g., C:\Windows\System32\drivers\etc\hosts) for any incorrect or outdated entries that might be overriding DNS resolution. If the hosts file has an incorrect mapping for example.com, the browser will use that instead of querying the DNS server, causing the failure. Checking DNS server configuration is appropriate if the hosts file is clean.
A technician is troubleshooting a user's inability to connect to a server. The technician runs 'tracert' from the user's workstation and sees that traffic stops at a particular router. The last hop shows a timeout. Which of the following is the most likely cause?
Explanation: The 'tracert' command relies on ICMP Time Exceeded messages from intermediate routers to map the path. When traffic stops at a particular router and the next hop shows a timeout, it indicates that the router cannot forward the packet to the next hop, meaning the next hop router is unreachable. This is the most direct cause because the traceroute fails to receive a response from the next hop, not because the destination is off or ICMP is blocked.
A network technician is troubleshooting a user's inability to connect to the network. The switch port is configured with port security with the default maximum of one MAC address. The user connects a computer and a VoIP phone to the port using the phone's built-in switch. Which of the following will MOST likely occur?
Explanation: With the default port security configuration, the switch port allows only one MAC address. When the VoIP phone connects, its own MAC address is learned first. The computer then connects through the phone's built-in switch, presenting a second MAC address, which violates the security policy. This triggers a security violation, and by default the port is placed into the errdisable state.
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Practice all Network Troubleshooting questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Network Troubleshooting. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Network Troubleshooting questions on the N10-009 frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Network Troubleshooting is tested as part of the CompTIA Network+ N10-009 blueprint. Practicing with targeted Network Troubleshooting questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but Network Troubleshooting is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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