CKAD Practice Question: Application Environment, Configuration and Security
This CKAD practice question tests your understanding of application environment, configuration and security. 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.
A namespace 'dev' has a ResourceQuota that sets 'requests.cpu: 4' and 'limits.cpu: 8'. A pod is created with a container that has 'resources.requests.cpu: 1' and 'resources.limits.cpu: 3'. However, the pod remains in Pending state. The output of 'kubectl describe quota -n dev' shows 'used requests.cpu: 3.5' and 'used limits.cpu: 7'. What is the most likely reason the pod is pending?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The pod's CPU limit exceeds the remaining quota.
The ResourceQuota in namespace 'dev' has a limit of 8 CPUs for limits.cpu, with 7 already used, leaving only 1 CPU remaining. The pod's container requests a limit of 3 CPUs, which exceeds the available 1 CPU, causing the scheduler to reject the pod and leave it in Pending state. ResourceQuota enforcement occurs at admission time, and the scheduler will not schedule a pod that would cause the namespace to exceed its quota limits.
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 pod's CPU limit exceeds the remaining quota.
Why this is correct
Adding 3 to the used 7 would exceed the 8 limit quota.
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 pod's CPU request exceeds the remaining quota.
Why it's wrong here
It also exceeds, but the limit also exceeds and typically limit quota is more restrictive.
✗
The pod's memory request is not set.
Why it's wrong here
No memory quota is mentioned, so it's not the issue.
✗
The namespace does not have a LimitRange set.
Why it's wrong here
LimitRange is not required for ResourceQuota to work.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often focus on the request (1 CPU) being within the remaining quota (0.5 CPU) and overlook that the limit (3 CPUs) exceeds the remaining limit quota (1 CPU), which is the actual blocking constraint.
Detailed technical explanation
How to think about this question
ResourceQuota works by tracking cumulative resource usage across all pods in a namespace, and the scheduler uses these values to determine if a new pod can be admitted. The 'used' values in 'kubectl describe quota' reflect the sum of all pod resource requests and limits, including those from running and terminated pods that are still counted until fully cleaned up. In real-world scenarios, this can lead to unexpected quota exhaustion if pods are not properly garbage-collected or if multiple pods with high limits are created in quick succession.
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.
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: The pod's CPU limit exceeds the remaining quota. — The ResourceQuota in namespace 'dev' has a limit of 8 CPUs for limits.cpu, with 7 already used, leaving only 1 CPU remaining. The pod's container requests a limit of 3 CPUs, which exceeds the available 1 CPU, causing the scheduler to reject the pod and leave it in Pending state. ResourceQuota enforcement occurs at admission time, and the scheduler will not schedule a pod that would cause the namespace to exceed its quota limits.
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.
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.
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Question Discussion
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