- A
Use OPA Gatekeeper to enforce a policy that rejects pods using images with the 'latest' tag.
Why wrong: Rejecting 'latest' tag does not verify image source or integrity.
- B
Configure imagePullSecrets for each namespace to ensure only authorized service accounts can pull images.
Why wrong: imagePullSecrets only provide authentication, not image validation.
- C
Deploy Kyverno with a policy that requires images to have a specific annotation indicating they passed a security scan.
Kyverno can enforce custom policies including image annotations that prove scanning.
- D
Implement a NetworkPolicy that blocks egress traffic from the cluster to unauthorized container registries.
Why wrong: NetworkPolicy controls network traffic, not image content.
- E
Set up an ImagePolicyWebhook admission controller that checks image signatures and only allows signed images from your registry.
ImagePolicyWebhook can enforce image provenance by validating signatures.
CKS Supply Chain Security Practice Question
This CKS practice question tests your understanding of supply chain security. 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.
You are securing a Kubernetes cluster that runs workloads from multiple teams. The cluster uses a private container registry and an admission controller to enforce image policies. Which TWO of the following actions are most effective in preventing the use of unapproved or tampered container images? (Choose two correct answers.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Deploy Kyverno with a policy that requires images to have a specific annotation indicating they passed a security scan.
Option C is correct because Kyverno can enforce policies that require images to have specific annotations, such as one indicating a passed security scan. This ensures only images that have been verified by your security pipeline are allowed to run, directly preventing unapproved or tampered images from being deployed.
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 OPA Gatekeeper to enforce a policy that rejects pods using images with the 'latest' tag.
Why it's wrong here
Rejecting 'latest' tag does not verify image source or integrity.
- ✗
Configure imagePullSecrets for each namespace to ensure only authorized service accounts can pull images.
Why it's wrong here
imagePullSecrets only provide authentication, not image validation.
- ✓
Deploy Kyverno with a policy that requires images to have a specific annotation indicating they passed a security scan.
Why this is correct
Kyverno can enforce custom policies including image annotations that prove scanning.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Implement a NetworkPolicy that blocks egress traffic from the cluster to unauthorized container registries.
Why it's wrong here
NetworkPolicy controls network traffic, not image content.
- ✓
Set up an ImagePolicyWebhook admission controller that checks image signatures and only allows signed images from your registry.
Why this is correct
ImagePolicyWebhook can enforce image provenance by validating signatures.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between authentication/authorization and image integrity verification, where candidates mistakenly choose options that control access to registries (like imagePullSecrets or NetworkPolicy) instead of options that validate image content or approval status.
Detailed technical explanation
How to think about this question
Kyverno uses Kubernetes admission webhooks to intercept pod creation requests and evaluate policies written in YAML. The policy in option C would use a 'validate' rule with a 'pattern' that checks for an annotation like 'security-scan-passed: true' on the image reference, leveraging the 'imageRegistry' variable to inspect the image metadata. In a real-world scenario, this annotation could be automatically added by a CI/CD pipeline after a successful vulnerability scan using tools like Trivy or Clair, ensuring only scanned images are admitted.
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 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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Supply Chain Security — study guide chapter
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FAQ
Questions learners often ask
What does this CKS question test?
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: Deploy Kyverno with a policy that requires images to have a specific annotation indicating they passed a security scan. — Option C is correct because Kyverno can enforce policies that require images to have specific annotations, such as one indicating a passed security scan. This ensures only images that have been verified by your security pipeline are allowed to run, directly preventing unapproved or tampered images from being deployed.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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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