- A
PodSecurityPolicy (PSP)
Why wrong: PSP is deprecated since v1.21 and removed in v1.25. It did not control image registries.
- B
ImagePolicyWebhook admission controller
ImagePolicyWebhook can enforce image policies including registry allowlists.
- C
Kyverno policy validating image registry
Kyverno can validate the image field against allowed registries.
- D
OPA/Gatekeeper constraint to validate registry
Gatekeeper can validate the image field against a list of allowed registries.
- E
NetworkPolicy to restrict egress to registries
Why wrong: NetworkPolicy controls network traffic, not what images can be deployed.
Question 115 of 997
Three Valid Methods to Enforce Only Images from a Specific Registry
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 are valid methods to enforce that only images from a specific registry can be deployed in a Kubernetes cluster? (Select three.)
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
✓
ImagePolicyWebhook admission controller
The ImagePolicyWebhook admission controller intercepts all Pod creation requests and validates the container image against an external webhook that enforces a policy, such as allowing only images from a specific registry. This is a native Kubernetes mechanism for admission control, making it a valid method to restrict image sources.
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.
- ✗
PodSecurityPolicy (PSP)
Why it's wrong here
PSP is deprecated since v1.21 and removed in v1.25. It did not control image registries.
- ✓
ImagePolicyWebhook admission controller
Why this is correct
ImagePolicyWebhook can enforce image policies including registry allowlists.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Kyverno policy validating image registry
Why this is correct
Kyverno can validate the image field against allowed registries.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
OPA/Gatekeeper constraint to validate registry
Why this is correct
Gatekeeper can validate the image field against a list of allowed registries.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
NetworkPolicy to restrict egress to registries
Why it's wrong here
NetworkPolicy controls network traffic, not what images can be deployed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The CKS exam often tests that candidates confuse PodSecurityPolicy (PSP) with image registry validation, but PSP only controls pod security attributes, not image sources; the trap is assuming PSP can filter registries because it has 'policy' in its name.
Detailed technical explanation
How to think about this question
The ImagePolicyWebhook works by sending an AdmissionReview request (with the Pod spec) to an external HTTPS webhook; the webhook must return an 'allowed' or 'denied' response based on the image registry. Kyverno and OPA/Gatekeeper are policy engines that can evaluate image registry constraints via custom resources (e.g., ClusterPolicy or ConstraintTemplate) and are commonly used in production to replace PSP. A real-world scenario: an organization uses ImagePolicyWebhook to block any image not signed by their private registry, preventing supply-chain attacks from public repositories.
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.
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.
- →
Supply Chain Security — study guide chapter
Learn the concepts, then practise the questions
- →
Supply Chain Security practice questions
Targeted practice on this topic area only
- →
All CKS questions
997 questions across all exam domains
- →
Certified Kubernetes Security Specialist CKS study guide
Full concept coverage aligned to exam objectives
- →
CKS practice test guide
How to use practice tests most effectively before exam day
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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: ImagePolicyWebhook admission controller — The ImagePolicyWebhook admission controller intercepts all Pod creation requests and validates the container image against an external webhook that enforces a policy, such as allowing only images from a specific registry. This is a native Kubernetes mechanism for admission control, making it a valid method to restrict image sources.
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 →
Same concept, more angles
1 more ways this is tested on CKS
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An organization uses Kyverno to enforce policies. Which Kyverno rule action would you use to require that all images come from a specific registry?
medium- A.verifyImages
- B.generate
- C.mutate
- ✓ D.validate
Why D: Option D is correct because the `validate` action in Kyverno is used to enforce policies that check resource attributes against specified rules. To require that all images come from a specific registry, you would use a `validate` rule with a pattern or deny clause that inspects the image field (e.g., `spec.containers[*].image`) and rejects any that do not match the allowed registry prefix. This ensures non-compliant resources are blocked at admission time.
Keep practising
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Last reviewed: Jul 4, 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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