312-50V11 · Question #723
What is the purpose of DNS AAAA record?
The correct answer is D. IPv6 address resolution record. A DNS AAAA record maps a hostname to a 128-bit IPv6 address, enabling IPv6 address resolution - analogous to how an A record maps a hostname to an IPv4 address. The 'quad-A' name reflects the fact that IPv6 is four times the size of IPv4.
Question
What is the purpose of DNS AAAA record?
Options
- AAddress prefix record
- BAddress database record
- CAuthorization, Authentication and Auditing record
- DIPv6 address resolution record
How the community answered
(14 responses)- A7% (1)
- D93% (13)
Why each option
A DNS AAAA record maps a hostname to a 128-bit IPv6 address, enabling IPv6 address resolution - analogous to how an A record maps a hostname to an IPv4 address. The 'quad-A' name reflects the fact that IPv6 is four times the size of IPv4.
'Address prefix record' is not a DNS record type - address prefix information is handled at the routing/network layer, not in DNS.
'Address database record' is not a recognized DNS record type or standard terminology in DNS specifications.
Authorization, Authentication, and Auditing (AAA) is a security framework implemented by protocols like RADIUS and TACACS+, not a DNS record type.
The DNS AAAA record (quad-A record) is used to resolve a fully qualified domain name to its corresponding IPv6 address (128-bit). Just as an A record provides IPv4 (32-bit) address resolution, the AAAA record was introduced to support the expanded IPv6 address space, and clients that support IPv6 query for AAAA records when performing hostname resolution.
Concept tested: DNS AAAA record and IPv6 hostname resolution
Source: https://www.rfc-editor.org/rfc/rfc3596
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