CCSP Cloud Platform and Infrastructure Security Practice Question
During a supply chain security review, a team discovers that container images are not being verified at admission time. Which Kubernetes-native tool should be implemented to ensure only signed images are deployed?
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
✓
Admission controller (e.g., Kyverno) with image signature verification
An admission controller like OPA Gatekeeper or Kyverno can enforce policies that verify image signatures before allowing pod creation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
NetworkPolicy
Why it's wrong here
NetworkPolicy filters pod ingress and egress traffic by labels, ports and CIDR ranges; it has no visibility into image signatures. It is tempting as a native admission-time control, but it is correct for segmenting pod network traffic, not for ensuring only signed images deploy.
- ✗
PodSecurityPolicy
Why it's wrong here
PodSecurityPolicy governs pod security contexts such as privileged mode and host namespaces; it cannot verify image signatures at admission. It is tempting as a native admission controller, but it is the right choice for restricting pod capabilities, not for enforcing signed images.
- ✓
Admission controller (e.g., Kyverno) with image signature verification
Why this is correct
Kyverno runs as a validating admission controller, so it evaluates image signatures against trusted keys before the pod is admitted, rejecting unsigned images. This is Kubernetes-native and enforces the supply chain requirement at admission time, unlike runtime scanners or registry-only checks.
- ✗
ResourceQuota
Why it's wrong here
ResourceQuota caps aggregate namespace consumption of CPU, memory and object counts; it never inspects image provenance. It is tempting because it is a built-in admission control, but it is correct when limiting resource usage per namespace, not for verifying signatures.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CCSP practice question is part of Courseiva's free ISC2 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 CCSP exam.