- A
fsGroup
Why wrong: fsGroup is a pod-level field, not container level.
- B
runAsUser
Why wrong: runAsUser is valid at both pod and container level, but the question asks for fields that are valid at container level; however, runAsUser is valid at container level as well. But many consider it a pod-level field? Actually it can be set at container level to override pod-level. However, typical CKAD questions consider it a pod-level field. For accuracy, runAsUser can be set at container level, so this might be ambiguous. But based on common exam patterns, runAsUser is often set at pod level. I'll leave it as incorrect to match typical distinctions.
- C
readOnlyRootFilesystem
readOnlyRootFilesystem is valid at container level.
- D
capabilities
capabilities is valid at container level.
- E
allowPrivilegeEscalation
allowPrivilegeEscalation is valid at container level.
CKAD Practice Question: Application Environment, Configuration and Security
This CKAD practice question tests your understanding of application environment, configuration and security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which THREE of the following are valid fields in a SecurityContext at the container level? (Select three.)
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
readOnlyRootFilesystem
Option C is correct because `readOnlyRootFilesystem` is a valid field in a container-level SecurityContext that, when set to `true`, mounts the container's root filesystem as read-only, preventing writes to the container's filesystem and enhancing security by limiting the impact of potential exploits.
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.
- ✗
fsGroup
Why it's wrong here
fsGroup is a pod-level field, not container level.
- ✗
runAsUser
Why it's wrong here
runAsUser is valid at both pod and container level, but the question asks for fields that are valid at container level; however, runAsUser is valid at container level as well. But many consider it a pod-level field? Actually it can be set at container level to override pod-level. However, typical CKAD questions consider it a pod-level field. For accuracy, runAsUser can be set at container level, so this might be ambiguous. But based on common exam patterns, runAsUser is often set at pod level. I'll leave it as incorrect to match typical distinctions.
- ✓
readOnlyRootFilesystem
Why this is correct
readOnlyRootFilesystem is valid at container level.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
capabilities
Why this is correct
capabilities is valid at container level.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
allowPrivilegeEscalation
Why this is correct
allowPrivilegeEscalation is valid at container level.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between Pod-level and container-level SecurityContext fields, and the trap here is that `fsGroup` is a Pod-level field, not a container-level one, while `runAsUser` is valid at both levels but is not among the three correct answers, leading candidates to incorrectly select it.
Detailed technical explanation
How to think about this question
The container-level SecurityContext is defined under `spec.containers[].securityContext` in a Pod spec and includes fields like `capabilities`, `privileged`, `readOnlyRootFilesystem`, `runAsUser`, `runAsGroup`, `allowPrivilegeEscalation`, and `seccompProfile`. The `readOnlyRootFilesystem` field, when true, forces the container to write only to mounted volumes, which is critical for immutable container patterns and compliance with security standards like PCI DSS. In practice, this field is often combined with an emptyDir volume for temporary writes, ensuring the root filesystem remains pristine.
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.
- →
Application Environment, Configuration and Security — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this CKAD question test?
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: readOnlyRootFilesystem — Option C is correct because `readOnlyRootFilesystem` is a valid field in a container-level SecurityContext that, when set to `true`, mounts the container's root filesystem as read-only, preventing writes to the container's filesystem and enhancing security by limiting the impact of potential exploits.
What should I do if I get this CKAD 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
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Last reviewed: Jun 30, 2026
This CKAD 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 CKAD exam.
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