LFCS Question #277: Real Exam Question with Answer & Explanation

Question

Options

• AThere is a syntax error.
• BIf DNS queries to the localhost fail, the server 208.77.188.166 will be queried.
• Cexample.com will be appended to all host lookups.
• DThe DNS servers at 127.0.0.1 and 208.77.188.166 will be queried in a round robin fashion.
• EThe DNS server with the shortest ping time will be queried first. If the lookup fails, the second server

Explanation

The provided /etc/resolv.conf entry contains a syntax error because IP addresses are incorrectly listed on a search directive line.

Common mistakes.

• B. This statement assumes valid configuration; due to the syntax error, the DNS servers cannot be correctly parsed and queried in the manner described.
• C. While example.com would typically be appended to host lookups if correctly configured, the syntax error on the line prevents the entire line from being correctly interpreted.
• D. DNS servers listed with the nameserver directive are queried in the order they appear, not in a round-robin fashion unless specifically configured by resolver libraries or local DNS caching daemons, and this line is syntactically incorrect for listing nameservers.
• E. The DNS resolver library queries nameservers in order, not based on ping time, and this statement assumes valid configuration which is not the case.

Concept tested. /etc/resolv.conf syntax

Reference. https://man7.org/linux/man-pages/man5/resolv.conf.5.html

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