This CKA practice question tests your understanding of troubleshooting. 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.
The pod starts, but after a few minutes it is killed with OOMKilled. What is the MOST likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Why wrong: The limit (128Mi) is higher than the request (64Mi), so this is valid.
B
The node has swap enabled
Why wrong: Swap is usually disabled in Kubernetes for memory accounting. If swap were enabled, the container might not be OOM-killed as quickly, but the limit still applies.
C
The container's memory usage exceeds the configured limit
The container is using more than 128Mi of memory, causing the OOM killer to terminate it.
D
The container is using too much CPU
Why wrong: CPU limits cause throttling, not OOM. OOM is related to memory.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The container's memory usage exceeds the configured limit
Option D is correct. OOMKilled occurs when the container exceeds its memory limit. The limit is 128Mi, so if the nginx container uses more than 128Mi of memory, it will be killed. Option A is incorrect because CPU limits cause throttling, not OOM. Option B is incorrect because swap is typically disabled in Kubernetes. Option C is incorrect because the request is lower than the limit, which is allowed.
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.
✗
The memory limit is lower than the memory request
Why it's wrong here
The limit (128Mi) is higher than the request (64Mi), so this is valid.
✗
The node has swap enabled
Why it's wrong here
Swap is usually disabled in Kubernetes for memory accounting. If swap were enabled, the container might not be OOM-killed as quickly, but the limit still applies.
✓
The container's memory usage exceeds the configured limit
Why this is correct
The container is using more than 128Mi of memory, causing the OOM killer to terminate it.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The container is using too much CPU
Why it's wrong here
CPU limits cause throttling, not OOM. OOM is related to memory.
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 CKA 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 CKA question in full detail.
Identify which CKA 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.
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The container's memory usage exceeds the configured limit — Option D is correct. OOMKilled occurs when the container exceeds its memory limit. The limit is 128Mi, so if the nginx container uses more than 128Mi of memory, it will be killed. Option A is incorrect because CPU limits cause throttling, not OOM. Option B is incorrect because swap is typically disabled in Kubernetes. Option C is incorrect because the request is lower than the limit, which is allowed.
What should I do if I get this CKA question wrong?
Identify which CKA 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This CKA 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 CKA exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.