- A
NodeRestriction: Limits the permissions of kubelet nodes to prevent unauthorized operations.
NodeRestriction limits the Node object modifications that kubelets can make, preventing privilege escalation.
- B
PodSecurity: Enforces Pod Security Standards (privileged, baseline, restricted).
PodSecurity replaces the deprecated PodSecurityPolicy and enforces pre-defined security profiles on pods.
- C
ServiceAccount: Controls automounting of service account tokens to pods.
ServiceAccount admission controller can deny or modify automount of service account tokens based on settings.
- D
AlwaysPullImages: Forces pods to always pull container images, ensuring no local cached images are used without verification.
AlwaysPullImages ensures images are pulled from registry each time, reducing risk of outdated or tampered images.
- E
NodeRestriction: Controls automounting of service account tokens to pods.
Why wrong: Incorrect — this describes the ServiceAccount admission controller, not NodeRestriction.
- F
PodSecurity: Limits the permissions of kubelet nodes.
Why wrong: Incorrect — this describes NodeRestriction, not PodSecurity.
Match Admission Controllers to Their Security Roles
This CKS practice question tests your understanding of cluster setup. 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.
Match each Kubernetes admission controller to its role in security.
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
NodeRestriction: Limits the permissions of kubelet nodes to prevent unauthorized operations.
Admission controllers intercept requests to the API server and can enforce security policies.
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.
- ✓
NodeRestriction: Limits the permissions of kubelet nodes to prevent unauthorized operations.
Why this is correct
NodeRestriction limits the Node object modifications that kubelets can make, preventing privilege escalation.
Related concept
Authentication checks who the user is.
- ✓
PodSecurity: Enforces Pod Security Standards (privileged, baseline, restricted).
Why this is correct
PodSecurity replaces the deprecated PodSecurityPolicy and enforces pre-defined security profiles on pods.
Related concept
Authentication checks who the user is.
- ✓
ServiceAccount: Controls automounting of service account tokens to pods.
Why this is correct
ServiceAccount admission controller can deny or modify automount of service account tokens based on settings.
Related concept
Authentication checks who the user is.
- ✓
AlwaysPullImages: Forces pods to always pull container images, ensuring no local cached images are used without verification.
Why this is correct
AlwaysPullImages ensures images are pulled from registry each time, reducing risk of outdated or tampered images.
Related concept
Authentication checks who the user is.
- ✗
NodeRestriction: Controls automounting of service account tokens to pods.
Why it's wrong here
Incorrect — this describes the ServiceAccount admission controller, not NodeRestriction.
- ✗
PodSecurity: Limits the permissions of kubelet nodes.
Why it's wrong here
Incorrect — this describes NodeRestriction, not PodSecurity.
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 CKS questions on access control and AAA configuration.
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FAQ
Questions learners often ask
What does this CKS question test?
Cluster Setup — This question tests Cluster Setup — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: NodeRestriction: Limits the permissions of kubelet nodes to prevent unauthorized operations. — Admission controllers intercept requests to the API server and can enforce security policies.
What should I do if I get this CKS 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 CKS 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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Last reviewed: Jun 11, 2026
This CKS practice question is part of Courseiva's free CNCF 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 CKS exam.
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