This CKS practice question tests your understanding of system hardening. 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.
A cluster administrator wants to enforce Pod Security Standards at the namespace level using the built-in PodSecurity admission controller. The namespace 'test' should reject any pod that violates the 'baseline' level. Which command applies this correctly?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
kubectl label ns test pod-security.kubernetes.io/enforce=baseline
Option B is correct because the PodSecurity admission controller uses the label `pod-security.kubernetes.io/enforce` to enforce the specified Pod Security Standard (e.g., `baseline`) at the namespace level. Pods that violate the enforced level are rejected by the admission controller. The `enforce` label triggers the admission webhook to block non-compliant pods, which matches the requirement to reject violations.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
kubectl annotate ns test pod-security.kubernetes.io/enforce-version=baseline
Why it's wrong here
This annotation sets the version of the policy, not the enforcement level. The correct label is 'pod-security.kubernetes.io/enforce'.
✓
kubectl label ns test pod-security.kubernetes.io/enforce=baseline
Why this is correct
This label enforces the baseline Pod Security Standard on the namespace.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
kubectl label ns test pod-security.kubernetes.io/warn=baseline
Why it's wrong here
Warn only shows warnings, it does not block pods.
✗
kubectl label ns test pod-security.kubernetes.io/audit=baseline
Why it's wrong here
Audit only logs violations, it does not enforce them.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between the three Pod Security Standard modes (`enforce`, `warn`, `audit`) and the fact that only `enforce` actually blocks pods, while `warn` and `audit` are non-blocking; candidates frequently confuse `warn` or `audit` with enforcement.
Trap categories for this question
Command / output trap
Warn only shows warnings, it does not block pods.
Detailed technical explanation
How to think about this question
The PodSecurity admission controller evaluates pods against the three Pod Security Standards (privileged, baseline, restricted) based on namespace labels. The `enforce` label triggers a hard failure (rejection) via the admission webhook, while `warn` and `audit` only generate warnings or audit events respectively. Under the hood, the controller checks the pod's security context fields (e.g., `securityContext.capabilities`, `securityContext.privileged`) against the baseline profile's restricted list, such as disallowing `CAP_SYS_ADMIN` or host namespaces.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKS question in full detail.
System Hardening — This question tests System Hardening — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: kubectl label ns test pod-security.kubernetes.io/enforce=baseline — Option B is correct because the PodSecurity admission controller uses the label `pod-security.kubernetes.io/enforce` to enforce the specified Pod Security Standard (e.g., `baseline`) at the namespace level. Pods that violate the enforced level are rejected by the admission controller. The `enforce` label triggers the admission webhook to block non-compliant pods, which matches the requirement to reject violations.
What should I do if I get this CKS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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