Question 37 of 997

Supply Chain Security →hardMultiple ChoiceObjective-mapped

Troubleshooting Kyverno Image Registry Validation

This CKS practice question tests your understanding of supply chain security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 have a Kyverno policy that validates images are from a specific registry. However, a pod using an image from that registry is still blocked. The pod YAML includes 'imagePullPolicy: Always'. What could be the issue?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.

A
The imagePullPolicy is set to Always, causing Kyverno to ignore the registry check
Why wrong: ImagePullPolicy does not affect admission control checks.
B
The pod uses a different registry name than the one in the policy (e.g., a mirror)
The policy must match the exact image path used.
C
Kyverno cannot validate images with a tag
Why wrong: Kyverno can validate images with tags.
D
The policy is missing the 'validate' rule type
Why wrong: Kyverno policies typically use 'validate' for such checks.

Full breakdown with real-world context →

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

✓

The pod uses a different registry name than the one in the policy (e.g., a mirror)

Option B is correct because Kyverno validates the image registry against the exact string specified in the policy. If the pod references an image from a mirror (e.g., `myregistry.io/nginx` instead of `myregistry.io/nginx`), or if the registry name differs (e.g., `docker.io` vs `registry-1.docker.io`), the validation fails even though the actual image content may be identical. The `imagePullPolicy: Always` is irrelevant to the registry check; it only affects when the kubelet pulls the image.

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.

✗
The imagePullPolicy is set to Always, causing Kyverno to ignore the registry check
Why it's wrong here
ImagePullPolicy does not affect admission control checks.
✓
The pod uses a different registry name than the one in the policy (e.g., a mirror)
Why this is correct
The policy must match the exact image path used.
Clue confirmation
The clue word "always" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Kyverno cannot validate images with a tag
Why it's wrong here
Kyverno can validate images with tags.
✗
The policy is missing the 'validate' rule type
Why it's wrong here
Kyverno policies typically use 'validate' for such checks.

Common exam traps

Common exam trap: answer the scenario, not the keyword

CKS often tests the misconception that `imagePullPolicy: Always` overrides or bypasses image validation policies, when in fact it only affects image caching and pull behavior, not security checks.

Detailed technical explanation

How to think about this question

Kyverno uses the `image` field in the pod spec to match against patterns defined in the policy's `match` or `exclude` blocks. Under the hood, it parses the image string into registry, repository, and tag/digest components. A common subtlety is that registry mirrors (e.g., `docker.io` vs `registry-1.docker.io`) or default registry expansions (e.g., `nginx` expands to `docker.io/library/nginx`) can cause mismatches. In real-world scenarios, teams often use internal mirrors for air-gapped environments, and the policy must explicitly include the mirror registry name.

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.

Related CKS practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Monitoring Logging and Runtime Security practice questions

Practise CKS questions linked to Monitoring Logging and Runtime Security.

Cluster Setup and Hardening practice questions

Practise CKS questions linked to Cluster Setup and Hardening.

System Hardening practice questions

Practise CKS questions linked to System Hardening.

Minimize Microservice Vulnerabilities practice questions

Practise CKS questions linked to Minimize Microservice Vulnerabilities.

Supply Chain Security practice questions

Practise CKS questions linked to Supply Chain Security.

Monitoring, Logging and Runtime Security practice questions

Practise CKS questions linked to Monitoring, Logging and Runtime Security.

Cluster Setup practice questions

Practise CKS questions linked to Cluster Setup.

Cluster Hardening practice questions

Practise CKS questions linked to Cluster Hardening.

CKS fundamentals practice questions

Practise CKS questions linked to CKS fundamentals.

CKS scenario practice questions

Practise CKS questions linked to CKS scenario.

CKS troubleshooting practice questions

Practise CKS questions linked to CKS troubleshooting.

Practice this exam

Start a free CKS practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

CKS practice-test guide →Study guide →Browse all practice tests

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: The pod uses a different registry name than the one in the policy (e.g., a mirror) — Option B is correct because Kyverno validates the image registry against the exact string specified in the policy. If the pod references an image from a mirror (e.g., `myregistry.io/nginx` instead of `myregistry.io/nginx`), or if the registry name differs (e.g., `docker.io` vs `registry-1.docker.io`), the validation fails even though the actual image content may be identical. The `imagePullPolicy: Always` is irrelevant to the registry check; it only affects when the kubelet pulls the image.

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: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.

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 →

How Courseiva writes practice questions · Editorial policy

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. You have a Kyverno policy that validates image registries. The policy should allow only images from `myregistry.example.com`. Which Kyverno rule field should be used to check the image registry?

hard

A.mutate
B.resources
✓ C.imageRegistry
D.generate

Why C: The `imageRegistry` field in a Kyverno policy rule is specifically designed to validate image registries by matching the registry hostname against a pattern. In this case, setting `imageRegistry: "myregistry.example.com/*"` ensures only images from that registry are allowed, blocking others at admission time.

Keep practising

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

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.