200-901 Network Fundamentals Practice Question
An administrator is configuring DNS records for a company's domain. Which three DNS record types are most commonly used to map hostnames to IP addresses or aliases? (Choose three.)
⚠ Common exam trap
Cisco often tests the distinction between forward-mapping records (A, AAAA, CNAME) and service-specific or reverse records (MX, PTR), leading candidates to mistakenly include MX or PTR when the question explicitly asks for hostname-to-IP or alias 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 A record maps a hostname to an IPv4 address, the AAAA record maps a hostname to an IPv6 address, and the CNAME record maps an alias hostname to the canonical (true) hostname. These three are the most common DNS record types used for hostname-to-IP or alias resolution in both IPv4 and IPv6 networks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
AAAA
Why this is correct
AAAA record maps a hostname to an IPv6 address.
- ✓
CNAME
Why this is correct
CNAME maps an alias hostname to the canonical (real) hostname.
- ✓
A
Why this is correct
A record maps a hostname to an IPv4 address.
- ✗
MX
Why it's wrong here
MX records are used for mail exchange, not hostname-to-IP mapping.
- ✗
PTR
Why it's wrong here
PTR records are used for reverse DNS lookups (IP to hostname).
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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.