010-160 · Question #67
Which of the following DNS record types hold an IP address? (Choose two.)
The correct answer is B. AAAA D. A. DNS A records store IPv4 addresses and AAAA records store IPv6 addresses. Both record types map a hostname directly to a numeric IP address.
Question
Options
- ANS
- BAAAA
- CMX
- DA
- ECNAME
How the community answered
(22 responses)- A5% (1)
- B91% (20)
- C5% (1)
Why each option
DNS A records store IPv4 addresses and AAAA records store IPv6 addresses. Both record types map a hostname directly to a numeric IP address.
An NS (Name Server) record delegates a DNS zone to authoritative name servers and contains a hostname, not an IP address.
An AAAA (quad-A) record maps a hostname to a 128-bit IPv6 address (e.g., 2001:db8::1), making it the IPv6 counterpart to the A record.
An MX (Mail Exchange) record specifies the mail server responsible for accepting email for a domain and contains a hostname with a priority value, not an IP address.
An A (address) record maps a hostname to a 32-bit IPv4 address (e.g., 192.0.2.1) and is the most fundamental DNS record type for name-to-IP resolution.
A CNAME (Canonical Name) record creates an alias from one hostname to another hostname, not to an IP address.
Concept tested: DNS A and AAAA record types IP address mapping
Source: https://www.rfc-editor.org/rfc/rfc1035
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