100-150 Question 222
Single answerA user reports that they cannot reach a specific website. You have connected to their workstation and want to determine if the issue is related to DNS resolution. Which command would you run and what result would confirm a DNS issue?
- A
Run 'ping
' and observe if it returns an IP address or 'Ping request could not find host'. - B
Run 'tracert
' and check where the path fails to respond. - C
Run 'nslookup
' and check if it returns an IP address or reports a failure. - D
Run 'ipconfig' and check the workstation's IP configuration details.
Show answer and explanation
Correct answer: C
Explanation
To determine if the issue is DNS-related, the 'nslookup' command is the most appropriate. It directly queries the DNS server to resolve the domain name to an IP address. If the command fails, it confirms that there is a DNS resolution issue, which could be due to incorrect DNS settings or a problem with the DNS server itself.
- A. Incorrect.
Running 'ping
' can help test connectivity, but it does not directly indicate if the issue is DNS-related. A failed ping could be due to other reasons such as network connectivity or firewall settings. - B. Incorrect.
'tracert
' traces the path to the destination, but it is generally used to diagnose routing issues and not specifically DNS resolution problems. - C. Correct.
'nslookup
' is specifically designed to query DNS servers and verify if the domain name resolves to an IP address. If it fails, it confirms a DNS issue. - D. Incorrect.
'ipconfig' provides details about the local network configuration, such as the IP address, subnet mask, and default gateway. While it is useful for diagnosing network issues, it does not directly check DNS resolution.