This CKA practice question tests your understanding of workloads & scheduling. 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.
Which THREE of the following are valid reasons for a Pod to be in Pending state? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The node selector does not match any available node.
A Pod enters Pending state when it cannot be scheduled onto a node. Option A is correct because if the Pod's node selector specifies labels that no node in the cluster possesses, the scheduler cannot find a matching node, leaving the Pod unscheduled and in Pending state.
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 node selector does not match any available node.
Why this is correct
If no node matches the nodeSelector, the Pod remains unscheduled.
Related concept
Read the scenario before looking for a memorised answer.
✓
The PersistentVolumeClaim used by the Pod is not bound.
Why this is correct
If a PVC is not bound, the Pod will stay pending until the claim is satisfied.
Related concept
Read the scenario before looking for a memorised answer.
✓
The cluster does not have enough resources to schedule the Pod.
Why this is correct
Insufficient CPU/memory can cause the scheduler to leave the Pod pending.
Related concept
Read the scenario before looking for a memorised answer.
✗
The Pod has a restartPolicy of OnFailure and the container exits with code 0.
Why it's wrong here
A completed job is not pending; it is in Completed state.
✗
The container image does not exist.
Why it's wrong here
A missing image leads to ImagePullBackOff, not Pending.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between scheduling failures (Pending) and runtime failures (ImagePullBackOff, CrashLoopBackOff), so candidates may mistakenly think a missing image causes Pending instead of the correct ImagePullBackOff state.
Detailed technical explanation
How to think about this question
The Pending state is the initial phase of a Pod's lifecycle, during which the kube-scheduler evaluates constraints like node selector, resource requests, and PersistentVolumeClaim binding. If the scheduler cannot find a suitable node, the Pod remains in Pending indefinitely until the condition is resolved. The scheduler uses predicates such as PodFitsResources and MatchNodeSelector to filter nodes, and if all predicates fail, the Pod is unschedulable.
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 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.
Workloads & Scheduling — This question tests Workloads & Scheduling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The node selector does not match any available node. — A Pod enters Pending state when it cannot be scheduled onto a node. Option A is correct because if the Pod's node selector specifies labels that no node in the cluster possesses, the scheduler cannot find a matching node, leaving the Pod unscheduled and in Pending state.
What should I do if I get this CKA 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.
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Question Discussion
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