What record is a mapping of an IP address to a hostname?
a. RR
b. SOA
c. A
d. PTR
d. PTR
Explanation: The information of the domain and its hosts and services are defined by resource records (RRs) and are organized by zones. Start of Authority (SOA) is a mandatory RR for each zone. It marks the start of the zone and provides the technical details of the zone. Address (A) record is a hostname mapping to an IP address. Pointer (PTR) record is a reverse of an A record. It is a mapping of an IP address to a hostname.
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