- A
The webhook server uses HTTP instead of HTTPS
Why wrong: Although HTTPS is recommended, HTTP is allowed if configured; this would not prevent the webhook from being called.
- B
The webhook service is of type ClusterIP
Why wrong: ClusterIP is fine for internal communication.
- C
The webhook server returns a 502 status code
Why wrong: The webhook is still called; the response status affects admission decision but does not prevent the call.
- D
The 'clientConfig.service.namespace' does not match the namespace of the webhook service
The API server uses this namespace to route requests to the webhook service.
Question 590 of 997
Common Misconfiguration: Wrong namespace in clientConfig.service.namespace
This CKS practice question tests your understanding of minimize microservice vulnerabilities. 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.
A ValidatingWebhookConfiguration is not working as expected. The webhook server is running and accessible. What is a common misconfiguration that would cause the webhook to not be called?
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 'clientConfig.service.namespace' does not match the namespace of the webhook service
Option D is correct because the ValidatingWebhookConfiguration's `clientConfig.service.namespace` field must exactly match the namespace where the webhook's Kubernetes Service object resides. If this namespace is misconfigured, the API server cannot resolve the service endpoint to call the webhook, causing the webhook to be silently skipped or fail to be invoked.
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 server uses HTTP instead of HTTPS
Why it's wrong here
Although HTTPS is recommended, HTTP is allowed if configured; this would not prevent the webhook from being called.
- ✗
The webhook service is of type ClusterIP
Why it's wrong here
ClusterIP is fine for internal communication.
- ✗
The webhook server returns a 502 status code
Why it's wrong here
The webhook is still called; the response status affects admission decision but does not prevent the call.
- ✓
The 'clientConfig.service.namespace' does not match the namespace of the webhook service
Why this is correct
The API server uses this namespace to route requests to the webhook service.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
In the CKS exam, a common trap is to assume that any HTTP error or connectivity issue would prevent webhook invocation. However, a misconfigured namespace in the `clientConfig.service.namespace` field results in the API server being unable to resolve the service endpoint, causing the webhook to not be called at all, often without any explicit error. This is distinct from issues like TLS misconfiguration that would produce connection errors.
Detailed technical explanation
How to think about this question
The ValidatingWebhookConfiguration relies on the `clientConfig` to locate the webhook server, either via a `url` or a `service` reference. When using `service`, the API server performs a DNS lookup for `<service>.<namespace>.svc` and must match the configured namespace to the Service's actual namespace. A mismatch causes a DNS resolution failure, and the API server logs an error like 'failed to call webhook' without triggering the webhook's admission logic.
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.
Visual reference
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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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 'clientConfig.service.namespace' does not match the namespace of the webhook service — Option D is correct because the ValidatingWebhookConfiguration's `clientConfig.service.namespace` field must exactly match the namespace where the webhook's Kubernetes Service object resides. If this namespace is misconfigured, the API server cannot resolve the service endpoint to call the webhook, causing the webhook to be silently skipped or fail to be invoked.
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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