XK0-005 Exam Dumps | An average of one out of three users in a company cannot reach the company website. A Linux administrator

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CompTIA.XK0-005.v2026-01-11.q177
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Question 22/177

An average of one out of three users in a company cannot reach the company website. A Linux administrator determines that one of the three website servers is down. The administrator inspects the DNS configuration for the website and notices the following entry:
nginx
WWW IN A 5.5.5.1
IN A 5.5.5.2
IN A 5.5.5.3
Which of the following accurately explains the issue?

A. The DNS configuration is missing corresponding AAAA records and PTR records, and this is causing clients to fail the hostname translation.

B. The administrator has incorrectly configured the DNS server to be an iterative resolver instead of an authoritative resolver.

C. One of the DNS records has not been signed with a DNSSEC-supported key, and this is causing some web browsers to reject the DNS response.

D. DNS returns all three records in a different order each time, and the browser typically uses the first address in the DNS response.

Correct Answer: D

The DNS configuration shows multiple A records under the same hostname (www). This is an example of Round Robin DNS, where the DNS server rotates the order of IPs returned to the client for load balancing.
Most browsers use the first IP address in the returned list. If one of the IPs (such as 5.5.5.2) corresponds to a downed server, users receiving that IP as the first result will be unable to reach the site.
* Option A is incorrect: AAAA and PTR records are not required for IPv4 DNS resolution.
* Option B is unrelated: whether the server is iterative or authoritative doesn't impact Round Robin behavior.
* Option C (DNSSEC) would affect all users if the signature was invalid.
This behavior is explicitly described in the CompTIA Linux+ XK0-005 Official Study Guide, under:
Domain 2.0: Networking - "Name Resolution (DNS)"
"DNS round robin distributes traffic across multiple A records. DNS servers rotate the order of A records in the response. Most clients use the first IP. If a server at that IP is down, the client may fail to connect, even if other servers are available."

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