KCSA Kubernetes Security Fundamentals Practice Question
Which TWO statements accurately describe how Kubernetes admission controllers function? (Choose TWO)
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
✓
Validating admission controllers can reject incoming requests but cannot modify the object content.
Admission controllers execute in two phases (mutating then validating) and can reject or modify requests before persistence.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Admission controllers run on the kubelet before container creation on the worker node.
Why it's wrong here
Admission controllers run as part of the kube-apiserver request pipeline in the control plane.
- ✓
Validating admission controllers can reject incoming requests but cannot modify the object content.
Why this is correct
Validation phase ensures compliance without mutating the payload.
- ✗
Admission controllers replace the need for RBAC authentication.
Why it's wrong here
Authentication and authorization happen before admission control.
- ✗
If any validating webhook fails and its failurePolicy is 'Ignore', the API server stops processing further webhooks.
Why it's wrong here
An 'Ignore' policy allows the request to proceed despite webhook failure, continuing or completing the flow.
- ✓
Mutating admission controllers execute before validating admission controllers and can modify object fields.
Why this is correct
Mutation happens first to ensure defaults and injections are applied before validation checks run.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official CNCF / Linux Foundation exam blueprint
This KCSA practice question is part of Courseiva's free CNCF / Linux Foundation 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 KCSA exam.