100-160 Question 126
Single answerA network administrator suspects that a specific host is unreachable due to a DNS resolution issue. Which of the following tools would be most appropriate to troubleshoot and verify DNS name resolution?
- A
netstat
- B
nslookup
- C
tcpdump
- D
ping
Show answer and explanation
Correct answer: B
Explanation
When troubleshooting DNS resolution issues, nslookup is the most effective tool as it allows you to query DNS servers directly and verify if a domain name resolves to the correct IP address. Other tools like netstat and tcpdump are useful for analyzing network connections and traffic but are not designed for DNS resolution testing. Ping can help verify connectivity but cannot diagnose DNS-specific problems.
- A. Incorrect.
netstat is used to display active network connections and listening ports, but it does not assist in resolving DNS issues.
- B. Correct.
nslookup is specifically designed to query DNS servers and troubleshoot DNS resolution issues, making it the most appropriate tool in this scenario.
- C. Incorrect.
tcpdump is a packet capture tool that can analyze network traffic but is not designed for DNS-specific troubleshooting.
- D. Incorrect.
ping is used to verify connectivity to a host by sending ICMP packets but does not troubleshoot DNS resolution directly.