This CKA practice question tests your understanding of services and networking. 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 DNS record does CoreDNS create for a headless Service named 'headless-svc' in the namespace 'default'?
A records for each pod IP backing the Service
Headless Services enable DNS-based service discovery returning pod IPs.
No DNS record
Why wrong: CoreDNS does create records for headless Services.
A CNAME record pointing to an external DNS
Why wrong: That's for ExternalName Services.
An A record for the Service IP (ClusterIP)
Why wrong: Headless Services have no ClusterIP.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
A records for each pod IP backing the Service
For a headless Service (clusterIP: None), CoreDNS returns A/AAAA records for the pod IPs backing the Service, not the Service IP.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
A records for each pod IP backing the Service
No DNS record
Why it's wrong here
CoreDNS does create records for headless Services.
A CNAME record pointing to an external DNS
Why it's wrong here
That's for ExternalName Services.
An A record for the Service IP (ClusterIP)
Why it's wrong here
Headless Services have no ClusterIP.
Common exam traps
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
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.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
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
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CKA questions on access control and AAA configuration.
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FAQ
Services and Networking — This question tests Services and Networking — Authentication checks who the user is..
The correct answer is: A records for each pod IP backing the Service — For a headless Service (clusterIP: None), CoreDNS returns A/AAAA records for the pod IPs backing the Service, not the Service IP.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CKA questions on access control and AAA configuration.
Authentication checks who the user is.
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Last reviewed: Jun 21, 2026
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