hardMultiple ChoiceObjective-mapped
CAS-004 Practice Question: An organization's containerized application is…
An organization's containerized application is deployed on Kubernetes. The security team wants to enforce that containers run with the least privilege and cannot access the host file system. Which Kubernetes security mechanism should be configured?
⚠ Common exam trap
Test-takers frequently confuse Kubernetes RBAC (which controls API access) with container-level security contexts (which control what the container process can do), leading them to select Option B instead of D.
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
✓
Pod Security Policy (PSP) with readOnlyRootFilesystem and runAsNonRoot
Pod Security Policy (PSP) is a Kubernetes admission controller that enforces security constraints on pods, such as preventing access to the host file system (via `readOnlyRootFilesystem`) and requiring containers to run as a non-root user (`runAsNonRoot`). This directly aligns with the least privilege principle and the requirement to block host file system access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Secrets management with Vault
Why it's wrong here
Secrets management handles credentials, not container runtime security.
- ✗
Role-based access control (RBAC) for service accounts
Why it's wrong here
RBAC governs Kubernetes API permissions, not container behavior.
- ✗
Network policies to restrict egress traffic
Why it's wrong here
Network policies filter traffic but do not affect container file system access.
- ✓
Pod Security Policy (PSP) with readOnlyRootFilesystem and runAsNonRoot
Why this is correct
PSP enforces security contexts; readOnlyRootFilesystem prevents writes to host file system.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 practice question is part of Courseiva's free CompTIA 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 CAS-005 exam.