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An average of one out of three users in a company cannot reach the company...

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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.

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