- A
The webhook configuration's rules do not match the pod create operation
If the rules do not include pods or the create operation, the webhook is not invoked.
- B
The webhook's failure policy is set to Ignore
Why wrong: If the webhook fails, it might allow the pod, but the webhook was not called at all.
- C
The webhook is only applied to pods in a specific namespace
Why wrong: Webhook rules can be namespace-scoped or cluster-scoped, but the question doesn't specify a namespace mismatch.
- D
The webhook only applies to pods created with a specific service account
Why wrong: Admission webhooks are not typically limited by service account.
Question 69 of 997
Why Your Admission Webhook Didn't Deny a Pod — Rules Mismatch
This CKS practice question tests your understanding of minimize microservice vulnerabilities. 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.
An admin has deployed a ValidatingWebhookConfiguration that denies pods with `runAsNonRoot: false`. After creating a pod that does not set `runAsNonRoot` at all, the pod is created successfully. Why did the webhook not deny it?
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 webhook configuration's rules do not match the pod create operation
A is correct because the ValidatingWebhookConfiguration's `rules` define which API operations (e.g., create, update) and resources (e.g., pods) trigger the webhook. If the rules do not include the `create` operation for pods, the webhook will not intercept the pod creation request, so the pod is created without validation. The pod's security context (missing `runAsNonRoot`) is irrelevant if the webhook never fires.
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 webhook configuration's rules do not match the pod create operation
Why this is correct
If the rules do not include pods or the create operation, the webhook is not invoked.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The webhook's failure policy is set to Ignore
Why it's wrong here
If the webhook fails, it might allow the pod, but the webhook was not called at all.
- ✗
The webhook is only applied to pods in a specific namespace
Why it's wrong here
Webhook rules can be namespace-scoped or cluster-scoped, but the question doesn't specify a namespace mismatch.
- ✗
The webhook only applies to pods created with a specific service account
Why it's wrong here
Admission webhooks are not typically limited by service account.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The CKS exam often tests the misconception that a webhook's failure policy (Ignore/Fail) controls whether it denies requests, when in fact the `rules` matching is the primary gate for webhook invocation.
Detailed technical explanation
How to think about this question
Under the hood, the `rules` field in a ValidatingWebhookConfiguration uses `apiGroups`, `apiVersions`, `operations`, and `resources` to match incoming API requests. If `operations` does not include `CREATE`, the API server skips calling the webhook entirely. A common subtlety is that `operations` defaults to `*` only if omitted, but if explicitly set to `UPDATE` or left empty, create requests are not intercepted. In real-world scenarios, misconfigured rules are a frequent cause of webhooks silently not firing, leading to security gaps.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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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Minimize Microservice Vulnerabilities — study guide chapter
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FAQ
Questions learners often ask
What does this CKS question test?
Minimize Microservice Vulnerabilities — This question tests Minimize Microservice Vulnerabilities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The webhook configuration's rules do not match the pod create operation — A is correct because the ValidatingWebhookConfiguration's `rules` define which API operations (e.g., create, update) and resources (e.g., pods) trigger the webhook. If the rules do not include the `create` operation for pods, the webhook will not intercept the pod creation request, so the pod is created without validation. The pod's security context (missing `runAsNonRoot`) is irrelevant if the webhook never fires.
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.
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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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