CKAD Application Observability and Maintenance Practice Question
This CKAD practice question tests your understanding of application observability and maintenance. 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.
You have a pod that is in a 'Pending' state. You run 'kubectl describe pod' and see the event: '0/3 nodes are available: 3 Insufficient cpu'. What is the most likely cause?
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 request is larger than the available CPU on any node
The event '0/3 nodes are available: 3 Insufficient cpu' indicates that the Kubernetes scheduler attempted to place the pod on each of the three nodes but found that none had enough allocatable CPU capacity to satisfy the pod's CPU request. This means the sum of CPU requests across all pods on each node, plus the new pod's request, exceeds the node's CPU capacity. The pod remains in 'Pending' because the scheduler cannot find a suitable node until CPU resources are freed or the request is reduced.
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 request is larger than the available CPU on any node
Why this is correct
The event indicates CPU insufficiency.
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 requires more memory than any node can provide
Why it's wrong here
The event specifically mentions CPU, not memory.
✗
The pod's liveness probe is failing
Why it's wrong here
Liveness probe failures would not cause a Pending state; they affect running pods.
✗
All nodes are tainted and the pod does not tolerate the taints
Why it's wrong here
Taints would cause a different message, such as 'node(s) had taint that the pod didn't tolerate'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between resource requests (used for scheduling) and resource limits (used for throttling), and candidates mistakenly think 'Insufficient cpu' refers to limits or actual usage rather than the guaranteed request that the scheduler evaluates.
Detailed technical explanation
How to think about this question
The scheduler uses a predicate called 'NodeResourcesFit' to check if a node has enough unallocated CPU and memory to meet the pod's resource requests. CPU requests are used for scheduling decisions and are guaranteed via the Completely Fair Scheduler (CFS) in the Linux kernel, which enforces CPU shares. In a real-world scenario, a pod with a CPU request of 2000m on a cluster of 1-core nodes will always remain pending, even if actual CPU utilization is low, because Kubernetes schedules based on requests, not actual usage.
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 Observability and Maintenance — This question tests Application Observability and Maintenance — 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 request is larger than the available CPU on any node — The event '0/3 nodes are available: 3 Insufficient cpu' indicates that the Kubernetes scheduler attempted to place the pod on each of the three nodes but found that none had enough allocatable CPU capacity to satisfy the pod's CPU request. This means the sum of CPU requests across all pods on each node, plus the new pod's request, exceeds the node's CPU capacity. The pod remains in 'Pending' because the scheduler cannot find a suitable node until CPU resources are freed or the request is reduced.
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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