CKAD Practice Question: Application Environment, Configuration and Security
This CKAD practice question tests your understanding of application environment, configuration and security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A developer wants to ensure that a pod runs with a non-root user and cannot gain root privileges. Which SecurityContext settings should be used?
Option C is correct because setting `runAsNonRoot: true` enforces that the container's user ID is non-zero (non-root), and `allowPrivilegeEscalation: false` prevents the container from gaining additional privileges beyond its initial set, such as through setuid binaries or kernel capabilities. Together, they ensure the pod runs as a non-root user and cannot escalate to root, satisfying the developer's requirement.
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.
✗
securityContext:
allowPrivilegeEscalation: false
Why it's wrong here
This does not prevent running as root; it only prevents privilege escalation.
✗
securityContext:
runAsNonRoot: true
Why it's wrong here
This prevents root but does not explicitly prevent privilege escalation.
allowPrivilegeEscalation: true defeats the purpose; it should be false.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think `runAsNonRoot: true` alone is sufficient to prevent privilege escalation, but it only restricts the initial user ID, not the ability to escalate later, which requires `allowPrivilegeEscalation: false`.
Detailed technical explanation
How to think about this question
Under the hood, `runAsNonRoot: true` causes the kubelet to reject the pod if the container's user ID is 0 (root), and it also sets the `USER` field in the container's security context to enforce this at runtime. `allowPrivilegeEscalation: false` controls the `no_new_privs` Linux kernel flag, which prevents the container from gaining new privileges via `setuid`/`setgid` binaries or file capabilities, even if the binary is owned by root. In practice, a common pitfall is that `runAsNonRoot` does not set a specific user ID; you must also define `runAsUser` to a non-zero value, otherwise the container may default to root if the image's `USER` directive is missing or set to root.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKAD question in full detail.
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: securityContext:
runAsNonRoot: true
allowPrivilegeEscalation: false — Option C is correct because setting `runAsNonRoot: true` enforces that the container's user ID is non-zero (non-root), and `allowPrivilegeEscalation: false` prevents the container from gaining additional privileges beyond its initial set, such as through setuid binaries or kernel capabilities. Together, they ensure the pod runs as a non-root user and cannot escalate to root, satisfying the developer's requirement.
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.
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Question Discussion
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