KCSA Platform Security Practice Question
Which THREE security controls can be enforced by admission webhook policy engines (like Kyverno or OPA Gatekeeper) regarding container images? (Choose three)
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
✓
Verifying cryptographic image signatures using tools like Cosign
Policy engines can enforce image security by requiring specific trusted registries, mandating cryptographic signatures, and blocking images with high/critical vulnerabilities.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Verifying cryptographic image signatures using tools like Cosign
Why this is correct
Policy engines can check signature annotations and public keys before allowing deployment.
- ✓
Requiring container images to be pulled exclusively from approved enterprise registries
Why this is correct
Policies can validate image name prefixes to ensure they originate from trusted registries.
- ✗
Automatically updating kernel modules on the underlying worker node
Why it's wrong here
Admission controllers operate on Kubernetes API objects, not host node kernel modules.
- ✗
Manually restarting unhealthy pods across worker nodes
Why it's wrong here
Pod restarts are managed by the kubelet and replica controllers, not policy admission engines.
- ✓
Blocking deployments of images that contain unmitigated high-severity vulnerabilities
Why this is correct
Policies can integrate with vulnerability scanner reports to block vulnerable image deployments.
About these practice questions
This KCSA question is part of Courseiva's 320-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.