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 to prevent kubelets from modifying Node objects they should not have access to?
NamespaceLifecycle
Why wrong: NamespaceLifecycle prevents deletion of system namespaces.
NodeRestriction
NodeRestriction restricts what a kubelet can modify on its node object.
PodSecurity
Why wrong: PodSecurity enforces Pod Security Standards, not kubelet restrictions.
ServiceAccount
Why wrong: ServiceAccount manages service account automounting.
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 Node and Pod objects to only those it is authorized to manage based on its credentials. It ensures a kubelet can only label, taint, or update status on its own Node object and cannot modify other Nodes, preventing privilege escalation or misconfiguration.
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.
NamespaceLifecycle
Why it's wrong here
NamespaceLifecycle prevents deletion of system namespaces.
NodeRestriction
Why this is correct
NodeRestriction restricts what a kubelet can modify on its node object.
Related concept
Read the scenario before looking for a memorised answer.
PodSecurity
Why it's wrong here
PodSecurity enforces Pod Security Standards, not kubelet restrictions.
ServiceAccount
Why it's wrong here
ServiceAccount manages service account automounting.
Common exam traps
CNCF often tests the distinction between admission plugins that control Pod security (PodSecurity) versus those that control Node-level access (NodeRestriction), leading candidates to confuse PodSecurity with Node-level restrictions.
Detailed technical explanation
The NodeRestriction plugin works by examining the username in the x509 certificate or bearer token of the kubelet request; it then enforces that the kubelet can only write to the Node object matching its node name and can only create/modify Pods bound to that Node. This prevents a compromised kubelet from tainting other nodes or altering their labels, which could disrupt scheduling or cluster operations. In practice, this plugin is critical in multi-tenant clusters where node isolation is required.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
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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 Node and Pod objects to only those it is authorized to manage based on its credentials. It ensures a kubelet can only label, taint, or update status on its own Node object and cannot modify other Nodes, preventing privilege escalation or misconfiguration.
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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