KCSA Platform Security Practice Question
Your organization requires that all container images deployed to the production cluster must be scanned for known Common Vulnerabilities and Exposures (CVEs) before admission. Which component in a cloud-native architecture is primarily responsible for intercepting and blocking deployments if a vulnerability threshold is exceeded?
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
✓
An Admission Controller webhook
An Admission Controller (such as an OPA/Gatekeeper validating webhook or a specialized image scanning admission webhook) intercepts API requests to the Kubernetes API server and can reject the deployment of vulnerable images.
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 Kubernetes Scheduler
Why it's wrong here
The scheduler assigns pending pods to nodes based on resource availability and constraints, not image security compliance.
- ✓
An Admission Controller webhook
Why this is correct
Admission controllers intercept requests to the Kubernetes API server to validate or mutate resources, making them ideal for enforcing image vulnerability policies.
- ✗
The kube-proxy daemonset
Why it's wrong here
Kube-proxy manages network rules and packet filtering on worker nodes, not image security.
- ✗
The container runtime (e.g., containerd)
Why it's wrong here
Containerd executes containers on the node, but it does not evaluate cluster-wide admission policies for vulnerability scanning.
About these practice questions
One of 320 original KCSA practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. 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.