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.
You have a Deployment with 3 replicas. You create a headless service (clusterIP: None) with a label selector. Which of the following is true about DNS resolution for this service?
DNS returns the IP addresses of all pods that match the selector.
Correct behavior.
DNS does not resolve the service name at all.
Why wrong: DNS does resolve, returning pod IPs.
DNS returns the service name as a CNAME to the pod names.
Why wrong: Headless services return A records for pod IPs, not CNAME.
DNS resolves the service name to a single ClusterIP.
Why wrong: Headless services do not have a 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
DNS returns the IP addresses of all pods that match the selector.
A headless service returns DNS A/AAAA records for the individual pod IPs, not a single ClusterIP. This is used for stateful applications where each pod needs a stable network identity.
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.
DNS returns the IP addresses of all pods that match the selector.
Why this is correct
Correct behavior.
Related concept
Authentication checks who the user is.
DNS does not resolve the service name at all.
DNS returns the service name as a CNAME to the pod names.
Why it's wrong here
Headless services return A records for pod IPs, not CNAME.
DNS resolves the service name to a single ClusterIP.
Why it's wrong here
Headless services do not have a 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: DNS returns the IP addresses of all pods that match the selector. — A headless service returns DNS A/AAAA records for the individual pod IPs, not a single ClusterIP. This is used for stateful applications where each pod needs a stable network identity.
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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