100-140 Question 224
Select 3A user reports that they are unable to access the company's website using its domain name, but they can access it using the IP address. You suspect a DNS issue and decide to use the 'nslookup' command to troubleshoot. After running 'nslookup www.company.com', you receive the response: 'Non-existent domain'. Based on this output, which of the following should you check next?
- A
Verify that the company's DNS server is reachable
- B
Check for a typo in the domain name entered during the nslookup query
- C
Ensure that the IP address of the web server is correctly configured
- D
Verify if the DNS zone file for the domain is properly configured on the DNS server
- E
Confirm if the user's computer has a stable internet connection
Show answer and explanation
Correct answers: A, B, D
Explanation
The 'Non-existent domain' response from nslookup typically indicates a DNS issue. To troubleshoot, you should ensure the DNS server is reachable, verify there is no typo in the domain name, and check the DNS zone file configuration. These steps address the most common causes of this error.
- A. Correct.
If the DNS server is unreachable, nslookup cannot resolve the domain name, leading to a 'Non-existent domain' error.
- B. Correct.
A typo in the domain name entered during the nslookup query will result in a failure to resolve the domain name.
- C. Incorrect.
While the web server's IP address configuration is important, it is not directly related to the 'Non-existent domain' response, as the issue lies with DNS resolution.
- D. Correct.
If the DNS zone file for the domain is not properly configured, the DNS server may fail to resolve the domain name.
- E. Incorrect.
Although a stable internet connection is necessary, the 'Non-existent domain' error specifically indicates a DNS issue, not a connectivity problem.