CKAD Application Observability and Maintenance Practice Question
This CKAD practice question tests your understanding of application observability and maintenance. 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 pod named 'app' is stuck in 'Pending' state. You run 'kubectl describe pod app' 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 higher than the available CPU on any node
The event '0/3 nodes are available: 3 Insufficient cpu' indicates that the pod's CPU resource request exceeds the allocatable CPU capacity on every node in the cluster. Kubernetes schedules pods based on resource requests, not limits, so if the sum of CPU requests across all pods on a node would exceed the node's capacity, the pod remains Pending. This is the most likely cause because the error message directly points to insufficient CPU resources.
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 higher than the available CPU on any node
Why this is correct
The scheduling failure is due to insufficient CPU resources on all nodes.
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 image is not found
Why it's wrong here
Image pull errors would show a different event, such as 'ErrImagePull'.
✗
The pod is in CrashLoopBackOff
Why it's wrong here
CrashLoopBackOff is a running state, not pending.
✗
The pod has been evicted due to memory pressure
Why it's wrong here
Eviction would show 'Evicted' status, not 'Pending'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse resource requests with resource limits, or assume that the pod is failing at runtime (like CrashLoopBackOff) when the error is purely a scheduling issue indicated by the Pending state and the specific 'Insufficient cpu' event.
Trap categories for this question
Command / output trap
Image pull errors would show a different event, such as 'ErrImagePull'.
Detailed technical explanation
How to think about this question
Kubernetes scheduling uses the kube-scheduler's predicate phase to filter nodes that satisfy a pod's resource requests, which are defined in the container spec under `resources.requests.cpu`. The scheduler compares the sum of all pod CPU requests on a node (including the new pod) against the node's allocatable CPU (node capacity minus kube-reserved and system-reserved). If no node passes this check, the pod remains Pending until resources free up or the request is reduced. A common real-world scenario is when a cluster is overcommitted or when a pod's request is set too high relative to node sizes.
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 higher than the available CPU on any node — The event '0/3 nodes are available: 3 Insufficient cpu' indicates that the pod's CPU resource request exceeds the allocatable CPU capacity on every node in the cluster. Kubernetes schedules pods based on resource requests, not limits, so if the sum of CPU requests across all pods on a node would exceed the node's capacity, the pod remains Pending. This is the most likely cause because the error message directly points to insufficient CPU resources.
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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