KCNA Kubernetes Fundamentals Practice Question
A pod is stuck in 'Pending' state. 'kubectl describe pod' shows '0/4 nodes are available: 4 Insufficient memory'. What is the most likely cause?
⚠ Common exam trap
Kubernetes certification exams often test the distinction between scheduling failures (Pending) and runtime errors (CrashLoopBackOff, ImagePullBackOff), so candidates mistakenly associate image or probe issues with Pending state instead of recognizing the scheduler's resource check.
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
✓
The pod requires more memory than any node can allocate
The error message '0/4 nodes are available: 4 Insufficient memory' directly indicates that the pod's memory request exceeds the allocatable memory on every node in the cluster. The Kubernetes scheduler evaluates resource requests (spec.containers[].resources.requests.memory) against node capacity, and if no node can satisfy the request, the pod remains in Pending state.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
All nodes have taints that the pod cannot tolerate
Why it's wrong here
The message specifically mentions insufficient memory, not taints.
- ✗
The pod's liveness probe is failing
Why it's wrong here
Liveness probes affect running containers, not scheduling.
- ✗
The container image is not found
Why it's wrong here
Image pull issues cause ImagePullBackOff, not Pending.
- ✓
The pod requires more memory than any node can allocate
Why this is correct
The error indicates no node has enough available memory.
Go deeper
Related to this question
About these practice questions
One of 833 original KCNA practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. 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.