Which DNS record maps a host name to an explicit IP address?

Which DNS record maps a host name to an explicit IP address?

• A. A Records
• B. SRV Records
• C. AAAA Records
• D. PTR Records

Answer: (A)

In DNS, forward mapping from a domain name to an IPv4 address is done with an A record. This type of record ties the host name directly to the explicit IPv4 address that clients use to reach the machine. If you needed IPv6, you’d use an AAAA record to map the name to an IPv6 address. SRV records indicate the location of services (which server and port), not the address itself. PTR records perform reverse lookups, mapping an IP back to a host name. So the one that maps a host name to a specific IPv4 address is the A record.

In DNS, forward mapping from a domain name to an IPv4 address is done with an A record. This type of record ties the host name directly to the explicit IPv4 address that clients use to reach the machine. If you needed IPv6, you’d use an AAAA record to map the name to an IPv6 address. SRV records indicate the location of services (which server and port), not the address itself. PTR records perform reverse lookups, mapping an IP back to a host name. So the one that maps a host name to a specific IPv4 address is the A record.