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 pod is failing to start with error 'container has runAsNonRoot and image will run as root'. The container image runs as root. Which change allows the pod to run?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set runAsUser to a non-zero UID, e.g., 1000
Option B is correct: set runAsUser to a non-zero ID to run as non-root, satisfying runAsNonRoot. Option A removes the check but may be insecure. Option C does not change user. Option D is not valid.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged 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.
✗
Remove runAsNonRoot: true from securityContext
Why it's wrong here
This would allow running as root, but the question likely expects a non-root solution.
✗
Add fsGroup: 1000
Why it's wrong here
fsGroup sets group ownership of volumes, not the user the container runs as.
✗
Set allowPrivilegeEscalation: false
Why it's wrong here
This does not change the user ID.
✓
Set runAsUser to a non-zero UID, e.g., 1000
Why this is correct
This overrides the image's user to a non-root user, satisfying runAsNonRoot.
Related concept
Authentication checks who the user is.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CKAD questions on access control and AAA configuration.
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Set runAsUser to a non-zero UID, e.g., 1000 — Option B is correct: set runAsUser to a non-zero ID to run as non-root, satisfying runAsNonRoot. Option A removes the check but may be insecure. Option C does not change user. Option D is not valid.
What should I do if I get this CKAD question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CKAD questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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