- A
The ResourceQuota applies to limits, not requests.
Why wrong: The question states the ResourceQuota sets 'requests.cpu', so it applies to requests.
- B
The namespace has already used all its CPU request quota.
Even though the pod's request is small, the total sum of requests in the namespace may have already reached the quota limit, preventing this pod from being scheduled.
- C
The pod does not specify a CPU limit.
Why wrong: ResourceQuota can be based on requests or limits; here it is on requests. The pod has a request, so this is not the issue. Also, missing a limit does not cause quota exceeded errors.
- D
The pod's CPU request exceeds the ResourceQuota limit.
Why wrong: The pod requests 500m, which is less than the quota of 2 (2000m). The individual request is not exceeding the quota.
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 in a namespace with a ResourceQuota that sets 'requests.cpu: 2' is failing to schedule. The pod manifest specifies 'resources: { requests: { cpu: "500m" } }'. What is the likely cause?
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
The namespace has already used all its CPU request quota.
The ResourceQuota sets a hard limit of 2 CPU cores for total requests across all pods in the namespace. If the sum of CPU requests from all pods already reaches or exceeds 2, a new pod with a 500m CPU request cannot be scheduled because it would exceed the quota. The pod's request (500m) is well within the quota limit, so the issue is that the namespace has exhausted its CPU request budget.
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 ResourceQuota applies to limits, not requests.
Why it's wrong here
The question states the ResourceQuota sets 'requests.cpu', so it applies to requests.
- ✓
The namespace has already used all its CPU request quota.
Why this is correct
Even though the pod's request is small, the total sum of requests in the namespace may have already reached the quota limit, preventing this pod from being scheduled.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The pod does not specify a CPU limit.
Why it's wrong here
ResourceQuota can be based on requests or limits; here it is on requests. The pod has a request, so this is not the issue. Also, missing a limit does not cause quota exceeded errors.
- ✗
The pod's CPU request exceeds the ResourceQuota limit.
Why it's wrong here
The pod requests 500m, which is less than the quota of 2 (2000m). The individual request is not exceeding the quota.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume the pod's individual request must be less than the quota, but they overlook that the quota is a cumulative limit across all pods in the namespace, so even a small request can fail if the namespace is already at capacity.
Detailed technical explanation
How to think about this question
ResourceQuota works by tracking the sum of resource requests (and optionally limits) across all pods in a namespace. When a new pod is created, the API server checks if the total requests (including the new pod) would exceed the quota; if so, the pod is rejected with a 'Forbidden' error. This is enforced at admission time, not at runtime, and the quota is recalculated when pods are deleted. In practice, this means you must monitor namespace usage with `kubectl describe quota` to avoid unexpected scheduling failures.
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 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.
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.
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Application Environment, Configuration and Security — study guide chapter
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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: The namespace has already used all its CPU request quota. — The ResourceQuota sets a hard limit of 2 CPU cores for total requests across all pods in the namespace. If the sum of CPU requests from all pods already reaches or exceeds 2, a new pod with a 500m CPU request cannot be scheduled because it would exceed the quota. The pod's request (500m) is well within the quota limit, so the issue is that the namespace has exhausted its CPU request budget.
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 25, 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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