312-50V10 · 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, analogous to how an A record maps a hostname to a 32-bit IPv4 address. The four A's reflect the fact that an IPv6 address is four times the length of an IPv4 address.
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
(28 responses)- B4% (1)
- C7% (2)
- D89% (25)
Why each option
A DNS AAAA record maps a hostname to a 128-bit IPv6 address, analogous to how an A record maps a hostname to a 32-bit IPv4 address. The four A's reflect the fact that an IPv6 address is four times the length of an IPv4 address.
'Address prefix record' is not a DNS record type - IPv6 prefix information is handled at the network layer, not in DNS AAAA records.
'Address database record' is not a real DNS record type or standard term in DNS nomenclature.
Authentication, Authorization, and Auditing (or Accounting) is the AAA security framework, which is entirely unrelated to DNS record types.
The AAAA (quad-A) DNS record type stores a 128-bit IPv6 address and is returned when a DNS resolver queries for the IPv6 address corresponding to a fully qualified domain name. When a client supports IPv6, it queries for AAAA records in addition to or instead of A records to obtain the appropriate address for establishing a connection. This record type is fundamental to IPv6 adoption and dual-stack network configurations.
Concept tested: DNS AAAA record and IPv6 address resolution
Source: https://www.rfc-editor.org/rfc/rfc3596
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