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 should be enabled on the API server to ensure that the kubelet cannot modify its own Node object beyond its assigned node?
PodSecurityPolicy
Why wrong: PodSecurityPolicy is deprecated and does not restrict kubelet.
AlwaysPullImages
Why wrong: This plugin forces image pull, not node restrictions.
ServiceAccount
Why wrong: This plugin manages service accounts, not kubelet restrictions.
NodeRestriction
This plugin enforces node-level 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 limits the kubelet's ability to modify its own Node object, ensuring it can only label, taint, or update status on its assigned Node. This prevents a compromised kubelet from impersonating other nodes or escalating privileges. It is the correct plugin for enforcing node-scoped kubelet permissions.
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.
PodSecurityPolicy
Why it's wrong here
PodSecurityPolicy is deprecated and does not restrict kubelet.
AlwaysPullImages
Why it's wrong here
This plugin forces image pull, not node restrictions.
ServiceAccount
Why it's wrong here
This plugin manages service accounts, not kubelet restrictions.
NodeRestriction
Why this is correct
This plugin enforces node-level restrictions.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
CNCF often tests the trap where candidates confuse NodeRestriction with PodSecurityPolicy or other admission controllers that deal with pod security, not kubelet node permissions.
Detailed technical explanation
Under the hood, NodeRestriction works by intercepting kubelet requests to the API server and verifying that the kubelet's credentials (typically from its bootstrap token or client certificate) match the Node object it is trying to modify. It enforces that a kubelet can only update its own Node's status, labels, and taints, and cannot create or delete Node objects. In a real-world scenario, if a kubelet is compromised, NodeRestriction prevents it from modifying other nodes to disrupt cluster scheduling or from removing its own node to evade monitoring.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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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 limits the kubelet's ability to modify its own Node object, ensuring it can only label, taint, or update status on its assigned Node. This prevents a compromised kubelet from impersonating other nodes or escalating privileges. It is the correct plugin for enforcing node-scoped kubelet permissions.
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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