Reverse DNS assigns hostnames to IP addresses. How is the name of the IP address 198.51.100.165 stored on a DNS server?
In the PTR record for 165.100.51.198.in-addr.arpa.
Reverse DNS resolves IP addresses to hostnames using PTR records, which specifically store the mapping for the IP address in the reverse domain format. For the IP address 198.51.100.165, it is stored as 165.100.51.198.in-addr.arpa, enabling lookup for its associated hostname.
The A record is used to map hostnames to their corresponding IPv4 addresses, not the other way around. This choice confuses the function of an A record with that of a PTR record, which is specifically designed for reverse lookups.
This choice accurately describes the correct storage format for the reverse DNS entry of the IP address 198.51.100.165. The PTR record is essential for linking the numerical IP address to its human-readable hostname.
RNAME records are not standard for reverse DNS lookups; they are used to specify the email address of the person responsible for the domain. This choice misidentifies the correct record type needed for mapping an IP address to a hostname.
There is no such thing as an ARPA record; instead, the ARPA domain is part of the naming convention for reverse DNS lookups. This choice misrepresents the structure and purpose of DNS records, leading to confusion.
REV records are not a valid DNS record type. This choice incorrectly implies a specific record type that does not exist in DNS nomenclature, further illustrating a misunderstanding of how reverse DNS functions.
Reverse DNS relies on PTR records to associate IP addresses with hostnames, utilizing the format that includes the in-addr.arpa domain. The entry for 198.51.100.165 is correctly stored in the PTR record for 165.100.51.198.in-addr.arpa, distinguishing it from other DNS record types that serve different purposes. Understanding these distinctions is crucial for effective DNS management and troubleshooting.
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