KCNA Container Orchestration Practice Question
A pod is stuck in 'Pending' state. Which of the following is a likely cause?
⚠ Common exam trap
CNCF often tests the distinction between scheduling failures (Pending) and runtime failures (CrashLoopBackOff, ImagePullBackOff), so candidates mistakenly associate image or probe issues with the Pending state.
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
✓
Insufficient cluster resources (CPU/memory) to schedule the pod
A pod stuck in 'Pending' state indicates that the pod has not been scheduled to a node. The most common cause is insufficient cluster resources (CPU/memory), as the Kubernetes scheduler cannot find a node that meets the pod's resource requests. This is a scheduling failure, not a runtime issue.
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 liveness probe failed
Why it's wrong here
Liveness probe failure causes pod restart, not Pending.
- ✗
The pod's readiness probe failed
Why it's wrong here
Readiness probe failure removes pod from service endpoints, not Pending.
- ✓
Insufficient cluster resources (CPU/memory) to schedule the pod
Why this is correct
If no node has enough resources, the pod stays Pending.
- ✗
The container image is missing
Why it's wrong here
Missing image would cause ImagePullBackOff.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This KCNA 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 KCNA exam.