N10-005 · Question #295
When querying a DNS server for an AAAA record, which of the following is an appropriate response?
The correct answer is D. 3ffe:1900:4545:3:200:f8ff:fe21:67cf. A DNS AAAA record maps a hostname to an IPv6 address. IPv6 addresses are 128-bit addresses written as eight groups of four hexadecimal digits separated by colons (e.g., 3ffe:1900:4545:3:200:f8ff:fe21:67cf). Option A (192.168.2.1) is an IPv4 address, which is returned by an A…
Question
When querying a DNS server for an AAAA record, which of the following is an appropriate response?
Options
- A192.168.2.1
- B00:f3:82:99:a2:b8
- C61.23.168.192.in-addr.arpa
- D3ffe:1900:4545:3:200:f8ff:fe21:67cf
How the community answered
(56 responses)- A5% (3)
- B2% (1)
- C2% (1)
- D91% (51)
Explanation
A DNS AAAA record maps a hostname to an IPv6 address. IPv6 addresses are 128-bit addresses written as eight groups of four hexadecimal digits separated by colons (e.g., 3ffe:1900:4545:3:200:f8ff:fe21:67cf). Option A (192.168.2.1) is an IPv4 address, which is returned by an A record, not AAAA. Option B (00:f3:82:99:a2:b8) is a MAC address, which is not stored in DNS. Option C (61.23.168.192.in-addr.arpa) is a PTR record format used for reverse DNS lookups of IPv4 addresses.
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