CKAD Application Design and Build Practice Question
This CKAD practice question tests your understanding of application design and build. 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.
You need to add a debugging container to a running pod named 'app-pod' in the 'dev' namespace. Which command achieves this?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
kubectl debug pod/app-pod -n dev --image=busybox --ephemeral
Option D is correct. kubectl debug allows adding ephemeral containers to running pods. The syntax kubectl debug pod/app-pod -n dev --image=busybox --ephemeral creates an ephemeral container. Option A (kubectl exec) runs commands in existing containers, not add containers. Option B (kubectl run) creates a new pod, not attach to existing. Option C (kubectl attach) attaches to a running container's stdin/stdout.
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.
✗
kubectl run debug-pod --image=busybox -n dev --rm -it
Why it's wrong here
This creates a new pod, not adds a container to the existing pod.
✗
kubectl attach pod/app-pod -n dev
Why it's wrong here
This attaches to an existing container's stdout/stderr, not adds a container.
✓
kubectl debug pod/app-pod -n dev --image=busybox --ephemeral
Why this is correct
This adds an ephemeral container to the running pod for debugging.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
kubectl exec pod/app-pod -n dev -it -- /bin/sh
Why it's wrong here
This runs a shell in an existing container, not adds a new container.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 practitioner preparing for the CKAD exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKAD question in full detail.
Identify which CKAD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Application Design and Build — This question tests Application Design and Build — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: kubectl debug pod/app-pod -n dev --image=busybox --ephemeral — Option D is correct. kubectl debug allows adding ephemeral containers to running pods. The syntax kubectl debug pod/app-pod -n dev --image=busybox --ephemeral creates an ephemeral container. Option A (kubectl exec) runs commands in existing containers, not add containers. Option B (kubectl run) creates a new pod, not attach to existing. Option C (kubectl attach) attaches to a running container's stdin/stdout.
What should I do if I get this CKAD question wrong?
Identify which CKAD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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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