Exam 010-160 Topic 1 Question 50 Discussion

Actual exam question for Lpi's 010-160 exam
Question #: 50
Topic #: 1
Reverse DNS assigns hostnames to IP addresses. How is the name of the IP address 198.51.100.165 stored on a DNS server?

Suggested Answer: B Vote an answer

Explanation
Reverse DNS lookups query DNS servers for a PTR (pointer) record; if the server does not have a PTR record, it cannot resolve a reverse lookup. PTR records store IP addresses with their segments reversed, and they append ".in-addr.arpa" to that. For example, if a domain has an IP address of 192.0.2.1, the PTR record will store the domain's information under 1.2.0.192.in-addr.arpa. In IPv6, the latest version of the Internet Protocol, PTR records are stored within the ".ip6.arpa" domain instead of ".in-addr.arpa."1 Therefore, the name of the IP address 198.51.100.165 is stored in the PTR record for
165.100.51.198.in-addr.arpa. References: 1: Reverse DNS lookup - Wikipedia 1

by Maxwell at Feb 11, 2026, 07:07 AM

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