KCNA Kubernetes Fundamentals Practice Question
You have a Pod that is in 'Pending' state. What is the most likely cause?
⚠ Common exam trap
CNCF often tests the distinction between Pod lifecycle states, and the trap here is confusing 'Pending' (pre-scheduling) with post-scheduling failures like image pull errors or container crashes, which have distinct states (e.g., ImagePullBackOff, 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
✓
The node is out of CPU or memory resources.
A Pod in 'Pending' state indicates that the scheduler has not yet assigned it to a node. The most common reason is insufficient resources (CPU or memory) on any available node, causing the scheduler to fail to find a suitable node that meets the Pod's resource requests. This is a core scheduling failure in Kubernetes.
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 is out of CPU or memory resources.
Why this is correct
If no node has sufficient resources to satisfy the Pod's requests, the scheduler cannot place it, leaving it Pending.
- ✗
The application inside the container crashed.
Why it's wrong here
An application crash would cause a running container to restart, resulting in CrashLoopBackOff.
- ✗
The container image is missing.
Why it's wrong here
A missing image would cause the Pod to be in ImagePullBackOff or ErrImagePull, not Pending.
- ✗
The Service does not have any endpoints.
Why it's wrong here
Service endpoints are unrelated to Pod scheduling.
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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.