This CKS practice question tests your understanding of cluster setup and hardening. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 admission plugin enforces that kubelets cannot modify pods they do not own?
PodSecurity
Why wrong: PodSecurity enforces Pod Security Standards, not node-level restrictions.
AlwaysPullImages
Why wrong: This plugin forces image pull policy to Always, unrelated to kubelet restrictions.
NodeRestriction
This plugin restricts kubelet self-service APIs.
ServiceAccount
Why wrong: This plugin manages service accounts, not kubelet restrictions.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
NodeRestriction
The NodeRestriction admission plugin ensures that kubelets can only modify Node and Pod objects that are bound to their own node. It enforces that a kubelet cannot update or delete pods it does not own, preventing a compromised or misconfigured kubelet from interfering with workloads on other nodes.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
PodSecurity
Why it's wrong here
PodSecurity enforces Pod Security Standards, not node-level restrictions.
AlwaysPullImages
Why it's wrong here
This plugin forces image pull policy to Always, unrelated to kubelet restrictions.
NodeRestriction
Why this is correct
This plugin restricts kubelet self-service APIs.
Related concept
Read the scenario before looking for a memorised answer.
ServiceAccount
Why it's wrong here
This plugin manages service accounts, not kubelet restrictions.
Common exam traps
CNCF often tests the NodeRestriction plugin as a control for kubelet authorization, and the trap here is confusing it with PodSecurity (which handles pod security contexts) or AlwaysPullImages (which handles image pull policy), rather than recognizing that NodeRestriction specifically limits what a kubelet can modify.
Detailed technical explanation
Under the hood, NodeRestriction works by validating the user info in the kubelet's TLS certificate (which includes the node name) against the object's spec.nodeName field. It also restricts the kubelet from modifying Node labels in the `node-restriction.kubernetes.io/` prefix, preventing privilege escalation via label-based scheduling tricks. In a real-world scenario, if a kubelet is compromised, NodeRestriction limits the blast radius to only the pods scheduled on that specific node.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CKS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Cluster Setup and Hardening — This question tests Cluster Setup and Hardening — Read the scenario before looking for a memorised answer..
The correct answer is: NodeRestriction — The NodeRestriction admission plugin ensures that kubelets can only modify Node and Pod objects that are bound to their own node. It enforces that a kubelet cannot update or delete pods it does not own, preventing a compromised or misconfigured kubelet from interfering with workloads on other nodes.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 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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