200-901 Network Fundamentals Practice Question
A developer is designing a microservices architecture where services need to discover each other using DNS. The team wants to map a service name 'payment-service.example.com' to its IPv6 address. Which DNS record type should be used?
⚠ Common exam trap
Cisco often tests the distinction between A and AAAA records, and the trap here is that candidates may confuse the AAAA record with the A record or incorrectly think a CNAME can resolve to an IP address directly.
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 record
The AAAA record (Quad-A) is the correct DNS record type for mapping a hostname to an IPv6 address, as defined in RFC 3596. Since the requirement is specifically to resolve 'payment-service.example.com' to an IPv6 address, the AAAA record is the appropriate choice.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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PTR record
Why it's wrong here
PTR record is used for reverse DNS lookup.
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AAAA record
Why this is correct
AAAA record maps a hostname to an IPv6 address.
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A record
Why it's wrong here
A record maps to an IPv4 address.
- ✗
CNAME record
Why it's wrong here
CNAME is an alias to another canonical name.
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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.