A network systems engineer is configuring name resolution for a newly deployed dual-stack web server. Workstations on the corporate network can successfully connect to the server over IPv4 using the hostname `app.finance.net`. However, IPv6 connectivity attempts fail because the hostname does not resolve to an IPv6 address.
To troubleshoot, the engineer executes the following diagnostic query from a workstation:
text
$ dig AAAA app.finance.net +short
The command produces no output, whereas running `dig A app.finance.net +short` returns `172.16.40.25`.
Which resource record type must be configured in the authoritative DNS zone file to enable host name resolution to the server's IPv6 address?
- An AAAA record mapping app.finance.net to the server's 128-bit IPv6 addressAnswer
- BA PTR record mapping the IPv4 address 172.16.40.25 to the server's IPv6 address
- CA CNAME record mapping app.finance.net to port 53 on the IPv6 host
- DA TXT record defining the socket transport protocol for IPv6 DNS queries
Answer
An AAAA record mapping the hostname directly to the server's 128-bit IPv6 address must be added to the zone file.
In DNS infrastructure, forward name resolution for IPv6 endpoints requires an AAAA (Quad-A) record, which maps a fully qualified domain name (FQDN) to a 128-bit IPv6 address. Because `dig AAAA app.finance.net` returned no answer, creating an AAAA record in the authoritative zone file directly resolves the issue.
Step-by-Step Solution
Key Concept
DNS Record Types for Dual-Stack (IPv4/IPv6) Name Resolution
Estimated Time:1m 15s