This KCNA practice question tests your understanding of kubernetes fundamentals. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
You run 'kubectl get pods' and see a pod in 'Pending' state for over 5 minutes. You describe the pod and see '0/1 nodes are available: 1 Insufficient memory'. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The pod's memory request is larger than any node's allocatable memory
The '0/1 nodes are available: 1 Insufficient memory' message indicates that the Kubernetes scheduler could not place the pod because no node has enough allocatable memory to satisfy the pod's memory request. Option B is correct because the pod's memory request exceeds the available memory on any node, causing the pod to remain in Pending state indefinitely until sufficient resources become available.
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 container image is too large
Why it's wrong here
Image size does not affect scheduling; only resource requests and limits affect scheduling decisions.
✓
The pod's memory request is larger than any node's allocatable memory
Why this is correct
If the memory request exceeds the available memory on all nodes, the scheduler cannot place the pod, leaving it in Pending.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The pod has a liveness probe that is failing
Why it's wrong here
Liveness probes are checked after the pod is running, not during scheduling. A Pending state means the pod hasn't been scheduled yet.
✗
The kubelet on the node is not running
Why it's wrong here
If a kubelet were not running, the node would be marked as NotReady, but the message specifically indicates insufficient memory.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between resource requests (used for scheduling) and resource limits (used for throttling/eviction), so candidates mistakenly think a large image or probe failure causes Pending state, but the scheduler only cares about resource requests and node availability.
Detailed technical explanation
How to think about this question
The Kubernetes scheduler uses a predicate-based algorithm to filter nodes based on resource requests (CPU, memory, ephemeral storage) defined in the pod spec. The 'Insufficient memory' condition is calculated by comparing the pod's memory request against the node's allocatable memory, which is the node's total capacity minus reserved resources for system daemons and kubelet overhead. In real-world scenarios, this often occurs when a pod's memory request is set too high due to misconfiguration or when multiple pods with high requests compete for limited node resources, leading to scheduling deadlock.
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 KCNA 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 KCNA question in full detail.
Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The pod's memory request is larger than any node's allocatable memory — The '0/1 nodes are available: 1 Insufficient memory' message indicates that the Kubernetes scheduler could not place the pod because no node has enough allocatable memory to satisfy the pod's memory request. Option B is correct because the pod's memory request exceeds the available memory on any node, causing the pod to remain in Pending state indefinitely until sufficient resources become available.
What should I do if I get this KCNA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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