CompTIA Network+ (N10-009)Network OperationsEasy
A web hosting company wants IPv6-only clients to resolve www.example.com directly to an IPv6 address without any translation. Which DNS record type must be created?
- AA
- BPTR
- CCNAME
- DAAAA
Show answer & explanationAnswer & explanation
Correct answer: D. AAAA
The AAAA record maps a hostname to a 128-bit IPv6 address, just as the A record maps a hostname to an IPv4 address. CNAME creates an alias, and PTR is used for reverse lookups.
Why the other options are wrong
- A. A records map hostnames to IPv4 addresses, not IPv6.
- B. PTR records are used for reverse DNS (IP-to-name), not forward resolution.
- C. CNAME is an alias record and does not itself hold an IP address.
AAAA Record
A DNS resource record that maps a fully qualified domain name to an IPv6 address.
- Analogous to the A record but for IPv6
- 'Quad-A' name comes from IPv6's 128-bit length vs IPv4's 32-bit
- Required for native IPv6 forward name resolution
Memory trick: Quad-A for the quadrupled address length of IPv6.