010-160: Linux EssentialsDemo

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QuestionQ56

The Linux Operating System

Reverse DNS maps hostnames to IP addresses. How is the name for IP address 198.51.100.165 stored on a DNS server?

  • A In the A record for 165.100.51.198.ipv4.arpa.
  • B In the PTR record for 165.100.51.198.in-addr.arpa.
  • C In the RNAME record for 198-51-100-165.rev.arpa.
  • D In the ARPA record for 165.100.51.198.rev.
  • E In the REV record for arpa.in-addr.198.51.100.165.
Explanation

IPv4 reverse DNS uses a PTR record under the in-addr.arpa namespace, with the IPv4 octets written in reverse order. Therefore, 198.51.100.165 is represented by 165.100.51.198.in-addr.arpa.

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