Q1. What does the 'tracert' command use to map network paths?
- A.ARP requests
- B.ICMP echo replies
- C.TTL expiration✓ Correct
- D.DNS queries
Explanation: Tracert increments TTL values to trigger ICMP Time Exceeded messages from each hop. Learn more.
CompTIA Network+ Practice Questions: Troubleshooting
7 free, exam-style CompTIA Network+ (N10-009) practice questions covering Troubleshooting. Each question shows the correct answer and a clear explanation. Ready for the real thing? Take the full timed quiz below.
Q2. Which tool measures signal loss in fiber optic cables?
- A.TDR
- B.OTDR✓ Correct
- C.Multimeter
- D.Protocol analyzer
Explanation: Optical Time-Domain Reflectometers (OTDRs) measure light loss/reflections in fiber. Learn more.
Q3. What is the primary purpose of MTR (My TraceRoute)?
- A.Encrypt traffic
- B.Combine ping and traceroute✓ Correct
- C.Analyze packet captures
- D.Test DNS resolution
Explanation: MTR (My TraceRoute) is a network diagnostic tool that continuously traces the route packets take to a destination while also measuring latency and packet loss. It combines the functionality of `ping` and `traceroute` into a single utility. Learn more.
Q4. Which of the following is a common symptom of a DNS misconfiguration on a client workstation?
- A.Inability to obtain an IP address.
- B.Slow file transfers within the local network.
- C.Ability to ping IP addresses but not resolve hostnames.✓ Correct
- D.High network latency to all destinations.
Explanation: If DNS is misconfigured, the client cannot resolve domain names to IP addresses. This often manifests as being able to reach resources by IP address (e.g., ping an IP) but not by their hostname or FQDN (e.g., browse a website by name). Learn more.
Q5. A technician suspects a newly installed network cable is faulty. Which tool would be BEST to verify the pinout and check for opens or shorts in the cable?
- A.OTDR
- B.Multimeter
- C.Cable tester✓ Correct
- D.Spectrum analyzer
Explanation: A basic cable tester can verify the physical connectivity of a copper cable, checking each wire pair for continuity (no opens), shorts, and correct pinout (e.g., T568A/B). Learn more.
Q6. Which of the following is a common symptom of an IP address conflict on a network?
- A.Slow wireless performance.
- B.Intermittent connectivity or no network access for one or both devices.✓ Correct
- C.Inability to print to a network printer.
- D.Websites loading without images.
Explanation: When two devices on the same network are assigned the same IP address, it causes an IP conflict. This typically results in one or both devices experiencing intermittent network connectivity or being unable to communicate on the network at all. Learn more.
Q7. Which command in Windows is used to display the MAC address table of the local machine (ARP cache)?
- A.ipconfig /all
- B.arp -a✓ Correct
- C.netstat -r
- D.getmac
Explanation: The `arp -a` command displays the current ARP cache entries, which map IP addresses to their corresponding MAC addresses for devices on the local network segment. Learn more.