- A
Use 'privileged' PSS with Warn mode
Why wrong: Privileged profile allows all capabilities and root, increasing breakout risk.
- B
Use 'baseline' PSS with Audit mode
Why wrong: Audit mode only logs violations, does not prevent breakouts.
- C
Use 'restricted' PSS with Enforce mode
Restricted profile requires non-root and drops all capabilities except net bind service.
- D
Use 'baseline' PSS with Enforce mode
Why wrong: Baseline restricts some capabilities but still allows running as root.
Question 484 of 997
Pod Security Standards Restricted Profile
This CKS practice question tests your understanding of minimize microservice vulnerabilities. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
During a security audit, a team discovers that their microservice application, deployed on Kubernetes, is vulnerable to container breakout attacks. The containers run as root and have many Linux capabilities. Which set of Pod Security Standards (PSS) enforcement modes and policies would best mitigate this risk?
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
✓
Use 'restricted' PSS with Enforce mode
The 'restricted' Pod Security Standard with 'Enforce' mode is the correct choice because it mandates the most stringent security controls, including dropping all Linux capabilities and preventing containers from running as root. This directly mitigates container breakout attacks by eliminating the excessive privileges that enable such exploits. 'Enforce' mode actively blocks non-compliant pods, ensuring the policy is applied without relying on user awareness or audit logs.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use 'privileged' PSS with Warn mode
Why it's wrong here
Privileged profile allows all capabilities and root, increasing breakout risk.
- ✗
Use 'baseline' PSS with Audit mode
Why it's wrong here
Audit mode only logs violations, does not prevent breakouts.
- ✓
Use 'restricted' PSS with Enforce mode
Why this is correct
Restricted profile requires non-root and drops all capabilities except net bind service.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use 'baseline' PSS with Enforce mode
Why it's wrong here
Baseline restricts some capabilities but still allows running as root.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that 'baseline' PSS is sufficient for most security needs, but the trap here is that 'baseline' still allows root and default capabilities, which are exactly the vectors exploited in container breakout attacks, making 'restricted' the only adequate choice for this specific risk.
Detailed technical explanation
How to think about this question
Pod Security Standards (PSS) are built on Kubernetes Pod Security Admission (PSA) controllers, which evaluate pods against predefined policies at admission time. The 'restricted' policy enforces the principle of least privilege by requiring `securityContext.runAsNonRoot: true` and `securityContext.capabilities.drop: ["ALL"]`, effectively nullifying common breakout techniques like using `CAP_SYS_ADMIN` to mount host filesystems or `CAP_NET_ADMIN` to manipulate network interfaces. In a real-world scenario, a container running as root with `CAP_SYS_ADMIN` could escape via `nsenter` or `cgroup` exploits, which the restricted policy directly prevents.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Minimize Microservice Vulnerabilities — study guide chapter
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FAQ
Questions learners often ask
What does this CKS question test?
Minimize Microservice Vulnerabilities — This question tests Minimize Microservice Vulnerabilities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use 'restricted' PSS with Enforce mode — The 'restricted' Pod Security Standard with 'Enforce' mode is the correct choice because it mandates the most stringent security controls, including dropping all Linux capabilities and preventing containers from running as root. This directly mitigates container breakout attacks by eliminating the excessive privileges that enable such exploits. 'Enforce' mode actively blocks non-compliant pods, ensuring the policy is applied without relying on user awareness or audit logs.
What should I do if I get this CKS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on CKS
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A security auditor requires that all pods in a cluster must not run as root. Which Pod Security Standard (PSS) and enforcement mode should be applied at the namespace level?
medium- A.Baseline profile with enforce mode
- ✓ B.Restricted profile with enforce mode
- C.Baseline profile with warn mode
- D.Privileged profile with audit mode
Why B: The Restricted profile is the only Pod Security Standard that prohibits running containers as root by enforcing the 'MustRunAsNonRoot' security context constraint. Applying it in 'enforce' mode ensures that any pod violating this rule is immediately rejected at admission time, which directly meets the auditor's requirement.
Keep practising
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Last reviewed: Jun 30, 2026
This CKS practice question is part of Courseiva's free CNCF 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 CKS exam.
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