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Question 681 of 1,052
mediummulti selectObjective-mapped
CCNA Practice Question: Which TWO DNS record types are most commonly used…
This 200-301 practice question tests your understanding of 200-301 exam topics. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO DNS record types are most commonly used to verify the mapping of a domain name to an IPv6 address when using nslookup or dig?
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 standard DNS record for mapping a hostname to an IPv6 address. The A record maps to an IPv4 address. CNAME is an alias, MX is for mail exchange, NS indicates name servers, and PTR is for reverse DNS (IP to name). Therefore, to verify an IPv6 address mapping, you would query the AAAA record.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 record
Why it's wrong here
An A record maps a hostname to an IPv4 address, not an IPv6 address.
- ✓
AAAA record
Why this is correct
The AAAA record is the standard record type for mapping a domain name to an IPv6 address.
Related concept
Authentication checks who the user is.
- ✗
CNAME record
Why it's wrong here
A CNAME record is an alias that points one domain name to another, not directly to an IP address.
- ✓
PTR record
Why this is correct
A PTR record performs reverse DNS lookup, mapping an IP address (including IPv6) back to a domain name. It is used to verify the reverse mapping for an IPv6 address.
Related concept
Authentication checks who the user is.
- ✗
MX record
Why it's wrong here
MX records specify mail exchange servers for a domain, not IP address mappings.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓AAAA recordCorrect answer▾
Why this is correct
The AAAA record is the standard record type for mapping a domain name to an IPv6 address.
✗A recordWrong answer — click to see why▾
Why this is wrong here
A records are for IPv4; the question specifically asks about IPv6.
✗CNAME recordWrong answer — click to see why▾
Why this is wrong here
CNAME does not provide IP address mapping; it redirects queries to another domain.
✗MX recordWrong answer — click to see why▾
Why this is wrong here
MX is for email routing, not for verifying IP address records.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 200-301 questions on access control and AAA configuration.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Authentication checks who the user is.
What is the correct answer to this question?
The correct answer is: AAAA record — The AAAA record (Quad-A) is the standard DNS record for mapping a hostname to an IPv6 address. The A record maps to an IPv4 address. CNAME is an alias, MX is for mail exchange, NS indicates name servers, and PTR is for reverse DNS (IP to name). Therefore, to verify an IPv6 address mapping, you would query the AAAA record.
What should I do if I get this 200-301 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 200-301 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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