This CKS practice question tests your understanding of supply chain security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 three of the following are valid ways to enforce supply chain security in a Kubernetes cluster? (Select THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Cosign to sign images and configure verification in the cluster
Options A, B, and D are correct. Using ImagePolicyWebhook enforces image policies. OPA/Gatekeeper can enforce policies like allowed registries. Cosign is used for image signing and verification. Option C is wrong because NetworkPolicy does not enforce image policies. Option E is wrong because ResourceQuota does not enforce image policies.
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.
✓
Use Cosign to sign images and configure verification in the cluster
Why this is correct
Cosign provides image signing and verification capabilities.
Related concept
Read the scenario before looking for a memorised answer.
✓
Configure ImagePolicyWebhook to reject images from untrusted registries
Why this is correct
ImagePolicyWebhook can be used to enforce image provenance policies.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use ResourceQuota to limit the number of images that can be pulled
Why it's wrong here
ResourceQuota limits resource usage, not image security.
✗
Use NetworkPolicy to block egress traffic to unknown registries
Why it's wrong here
NetworkPolicy controls network traffic, not image validation.
✓
Use OPA/Gatekeeper to enforce that container images come from an allowed list of registries
Why this is correct
OPA/Gatekeeper can create policies to validate image registries.
Related concept
Read the scenario before looking for a memorised answer.
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: Use Cosign to sign images and configure verification in the cluster — Options A, B, and D are correct. Using ImagePolicyWebhook enforces image policies. OPA/Gatekeeper can enforce policies like allowed registries. Cosign is used for image signing and verification. Option C is wrong because NetworkPolicy does not enforce image policies. Option E is wrong because ResourceQuota does not enforce image policies.
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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