100-140 Question 222
Single answerA user reports that they cannot access a website hosted at 'example.com.' You decide to troubleshoot using the 'nslookup' command. After running 'nslookup example.com', you receive a response showing multiple IP addresses. What does this output indicate?
- A
The website has multiple DNS records pointing to different IP addresses.
- B
The DNS server is misconfigured and returning incorrect results.
- C
The website uses a Content Delivery Network (CDN) or load balancer for traffic distribution.
- D
The website is unreachable, and the IP addresses are cached responses.
Show answer and explanation
Correct answer: A
Explanation
When 'nslookup' returns multiple IP addresses for a domain, it generally means that the domain has multiple DNS records configured. This can be used for redundancy, load balancing, or to support infrastructure like CDNs. The correct answer is the one that directly explains the observed 'nslookup' behavior.
- A. Correct.
This is correct. Multiple IP addresses in an 'nslookup' response indicate that the domain has multiple DNS records, such as A or AAAA records, pointing to different IPs. This is often used for redundancy or load balancing.
- B. Incorrect.
This is incorrect. A misconfigured DNS server would likely result in errors, such as 'non-existent domain' or incorrect IPs, rather than multiple valid IP addresses.
- C. Incorrect.
This is partially true but not the best answer. While a CDN or load balancer may use multiple IP addresses, the primary reason for seeing multiple IPs in 'nslookup' is that the domain has multiple records in the DNS configuration.
- D. Incorrect.
This is incorrect. Cached responses would typically not result in multiple IP addresses being displayed unless those were part of the original DNS records.