Which DNS Record Maps a Hostname to an IPv6 Address?
A network engineer is testing a website to ensure it is compatible with IPv6. After attempting to ping the website by its IPv6 address, the engineer determines that the DNS has not been set up properly. Which of the following should the network engineer complete to resolve this issue?
Community Votes
100% of anonymous learners picked answer C. Votes are pick records left by other test-takers — they are not the verified answer.
Community Insight
The question tests knowledge of DNS record types and IPv6 address resolution, with the common trap being misreading the option 'AAA' as a typo for 'AAAA' rather than recognizing it as the intended IPv6 DNS record.
When testing a website for IPv6 compatibility, a missing DNS record prevents pinging by IPv6 address. The correct fix is to add an AAAA (also written as AAA in the question) record, which maps a hostname to an IPv6 address, as confirmed by community consensus.
Choosing 'Enable a PTR record' because it deals with reverse DNS, but PTR records map IP addresses back to hostnames, not hostnames to IPv6 addresses. The correct record for forward resolution to an IPv6 address is the AAAA record.
Community Discussion (3 comments)
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Expert Analysis
Why the Answer Is Correct
The AAAA record (often referred to as 'quad A') is the DNS record type that stores the IPv6 address for a hostname. When a network engineer pings a website by its IPv6 address, the DNS lookup for the corresponding hostname requires an AAAA record to exist. If the DNS is not set up properly, the hostname will not resolve to the IPv6 address, so adding the AAAA record resolves the issue. Community comment [1] explains this: 'The AAAA record (or quad A record) points your hostname to an IPv6 address.' Option C in the exam is clearly a typo for 'AAAA,' as comment [2] notes: 'I’m assuming they meant “AAAA” and not “AAA.”'
Why the Other Options Are Wrong
A PTR record (option A) is used for reverse DNS lookups, mapping an IP address back to a hostname, not for mapping a hostname to an IPv6 address. A TXT record (option B) is used for arbitrary text, often for verification or SPF, and has no role in IPv6 address resolution. A secondary NS record (option D) is used to delegate a domain to another authoritative name server and does not affect hostname-to-address mapping. None of these options would allow a website hostname to resolve to an IPv6 address, making option C the only logical fix.
Community Comment Notes
Comment [1] provides a clear definition of the AAAA record, reinforcing that it is the correct mechanism for resolving a domain name to an IPv6 address. Comment [2] points out the typo in the option, which is important because the exam may use 'AAA' as shorthand for 'AAAA.' Comment [3] simply agrees with answer C, and overall the community vote is unanimous (C: 100). These comments together confirm that the intended answer is the AAAA record, despite the wording issue in the question.
Official Reference
Exam Strategy
When you see 'AAA' in a question about IPv6, recognize it as an abbreviation for 'AAAA'—the actual record type for IPv6 address mapping. Focus on what purpose each DNS record serves: AAAA for IPv6 forward resolution, PTR for reverse, TXT for text, and NS for delegation.
Related Analysis
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