200-901 Network Fundamentals Practice Question
Which DNS record type is used to map a domain name to an IPv6 address?
⚠ Common exam trap
Cisco often tests the AAAA record by pairing it with the A record as a distractor, expecting candidates to remember that IPv6 uses four 'A's (AAAA) while IPv4 uses a single 'A', and that CNAME and MX serve entirely different purposes unrelated to address mapping.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AAAA
The AAAA (quad-A) record is the DNS resource record type defined in RFC 3596 to map a fully qualified domain name to a 128-bit IPv6 address. Unlike the A record, which stores a 32-bit IPv4 address, the AAAA record holds the longer IPv6 address, enabling clients to resolve hostnames to IPv6 destinations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A
Why it's wrong here
A record maps to IPv4.
- ✓
AAAA
Why this is correct
AAAA record maps to IPv6.
- ✗
CNAME
Why it's wrong here
CNAME is an alias.
- ✗
MX
Why it's wrong here
MX is for mail servers.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-901 exam.