This CKS practice question tests your understanding of supply chain security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
You are tasked with ensuring that all container images in your cluster are scanned for vulnerabilities before being deployed. You have set up Trivy in your CI/CD pipeline and want to enforce that only images with no critical vulnerabilities are allowed. Which admission controller should you configure to reject pods using non-compliant images?
ImagePolicyWebhook is the admission controller designed to intercept image-related requests and can be configured to reject images based on external scanning results.
B
ValidatingAdmissionWebhook
Why wrong: While a ValidatingAdmissionWebhook can be used to enforce custom policies, it is not specifically designed for image policy enforcement; ImagePolicyWebhook is the standard approach for image policy.
C
PodSecurityPolicy (PSP)
Why wrong: PSP is deprecated and does not perform image vulnerability checks; it controls security context and privilege escalation.
D
ResourceQuota
Why wrong: ResourceQuota limits resource consumption, not image security.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ImagePolicyWebhook
Option C is correct. ImagePolicyWebhook is a Kubernetes admission controller that can be configured to call an external webhook to validate container images. It can reject pods based on policies such as vulnerability scan results. Other options are not designed for this purpose.
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.
✓
ImagePolicyWebhook
Why this is correct
ImagePolicyWebhook is the admission controller designed to intercept image-related requests and can be configured to reject images based on external scanning results.
Related concept
Read the scenario before looking for a memorised answer.
✗
ValidatingAdmissionWebhook
Why it's wrong here
While a ValidatingAdmissionWebhook can be used to enforce custom policies, it is not specifically designed for image policy enforcement; ImagePolicyWebhook is the standard approach for image policy.
✗
PodSecurityPolicy (PSP)
Why it's wrong here
PSP is deprecated and does not perform image vulnerability checks; it controls security context and privilege escalation.
✗
ResourceQuota
Why it's wrong here
ResourceQuota limits resource consumption, not image security.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Identify which CKS exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Supply Chain Security — This question tests Supply Chain Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: ImagePolicyWebhook — Option C is correct. ImagePolicyWebhook is a Kubernetes admission controller that can be configured to call an external webhook to validate container images. It can reject pods based on policies such as vulnerability scan results. Other options are not designed for this purpose.
What should I do if I get this CKS question wrong?
Identify which CKS exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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