N10-005 · Question #343
Which of the following DNS records must be queried to resolve the IPv6 address of a website?
The correct answer is C. AAAA. The AAAA DNS record type maps a hostname to its 128-bit IPv6 address, which must be queried to resolve IPv6 connectivity for a website.
Question
Which of the following DNS records must be queried to resolve the IPv6 address of a website?
Options
- ACNAME
- BPTR
- CAAAA
- DA
How the community answered
(52 responses)- A2% (1)
- B4% (2)
- C94% (49)
Why each option
The AAAA DNS record type maps a hostname to its 128-bit IPv6 address, which must be queried to resolve IPv6 connectivity for a website.
CNAME records create an alias from one domain name to another canonical domain name and do not store IP addresses of any version.
PTR records are used for reverse DNS lookups, mapping an IP address back to a hostname, not for forward resolution of IPv6 addresses.
AAAA records (pronounced 'quad-A') store the 128-bit IPv6 address associated with a fully qualified domain name. When a client needs to reach a website over IPv6, it queries DNS for the AAAA record of that domain to obtain the corresponding IPv6 address for connection establishment.
A records store 32-bit IPv4 addresses, not IPv6 addresses.
Concept tested: DNS AAAA record for IPv6 address resolution
Source: https://learn.microsoft.com/en-us/azure/dns/dns-overview
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