Question 69 of 720
CKS Minimize Microservice Vulnerabilities Practice Question
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?
⚠ Common exam trap
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.
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.
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.
- ✗
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.
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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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