KCSA Platform Security Practice Question
A security engineer is hardening a Kubernetes cluster and wants to ensure that all container images are pulled only from an approved internal container registry (e.g., registry.internal.corp). Which Kubernetes mechanism can enforce this restriction across all namespaces?
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
✓
Deploying a validating admission policy or webhook to check image registry URLs
Admission webhook policy engines like Kyverno or OPA Gatekeeper can intercept creation requests and validate that the image URL matches the approved registry domain prefix.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Deploying a validating admission policy or webhook to check image registry URLs
Why this is correct
Validating admission webhooks can inspect pod specs and reject pods using images from unauthorized registries.
- ✗
Configuring NodePort service selectors
Why it's wrong here
NodePort selectors manage network traffic routing, not image registry source restrictions.
- ✗
Enabling horizontal pod autoscaling
Why it's wrong here
HPA scales pod replicas based on CPU or custom metrics, unrelated to image registries.
- ✗
Modifying the kube-proxy IPVS configuration
Why it's wrong here
IPVS mode handles packet forwarding rules for services, not image source validation.
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.