KCNA Container Orchestration Practice Question
You run 'kubectl get pods' and see that a pod named 'web-frontend' is in 'Pending' state for more than 5 minutes. What is the most likely cause?
⚠ Common exam trap
CNCF often tests the distinction between pod states — candidates confuse 'Pending' (scheduling failure) with image pull errors or probe failures, which occur after scheduling and manifest as different states like 'ImagePullBackOff' or 'CrashLoopBackOff'.
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
✓
There are insufficient resources on any node to schedule the pod
A pod stuck in 'Pending' state for an extended period typically indicates that the scheduler cannot find a suitable node to run the pod. The most common reason is insufficient resources (CPU, memory, or ephemeral storage) on any available node, causing the scheduler to leave the pod unscheduled. This is confirmed by running 'kubectl describe pod web-frontend' and checking the 'Events' section for 'FailedScheduling' messages.
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 container image does not exist
Why it's wrong here
Missing image causes ImagePullBackOff, not Pending.
- ✓
There are insufficient resources on any node to schedule the pod
Why this is correct
Lack of CPU/memory or other constraints keeps the pod pending.
- ✗
The pod's readiness probe is failing
Why it's wrong here
Readiness probe failures affect service endpoints, not scheduling.
- ✗
The pod's liveness probe is failing
Why it's wrong here
Liveness probe failures lead to container restarts, not Pending.
Go deeper
Related to this question
About these practice questions
This KCNA question is part of Courseiva's 833-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.