CKAD Practice Question: Application Environment, Configuration and Security
This CKAD practice question tests your understanding of application environment, configuration and security. 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.
A pod is scheduled but stays in Pending state. 'kubectl describe pod' shows: '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 exceeds the available memory on any node.
The '0/1 nodes are available: 1 Insufficient memory' message indicates that the Kubernetes scheduler could not find a node with enough allocatable memory to satisfy the pod's memory request. The pod's memory request (spec.containers[].resources.requests.memory) must be less than or equal to a node's allocatable memory for the pod to be scheduled. Since no node meets this requirement, the pod remains in Pending state.
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 pod's memory request exceeds the available memory on any node.
Why this is correct
Correct: the scheduler cannot find a node with enough unallocated memory.
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 configured incorrectly.
Why it's wrong here
Liveness probes do not affect scheduling.
✗
The namespace has a ResourceQuota that blocks the pod.
Why it's wrong here
ResourceQuota would cause an error like 'exceeded quota', not 'Insufficient memory'.
✗
The pod's memory limit is set too low.
Why it's wrong here
Memory limit affects OOM kills, not scheduling. Scheduling is based on requests.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse memory requests with memory limits, assuming a low limit causes scheduling failure, when in fact the scheduler only evaluates requests, and limits only affect runtime OOM behavior.
Detailed technical explanation
How to think about this question
The Kubernetes scheduler uses predicates like 'NodeResourcesFit' to check if a node has enough allocatable resources (after subtracting kube-reserved and system-reserved) to satisfy the pod's requests. The 'Insufficient memory' message specifically refers to the memory request, not the limit, because requests are used for scheduling decisions (guaranteed QoS) while limits are enforced by cgroups at runtime. In multi-tenant clusters, this often occurs when pods with high memory requests are scheduled without proper node capacity planning or when nodes are overcommitted.
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 CKAD 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 CKAD question in full detail.
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — 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 exceeds the available memory on any node. — The '0/1 nodes are available: 1 Insufficient memory' message indicates that the Kubernetes scheduler could not find a node with enough allocatable memory to satisfy the pod's memory request. The pod's memory request (spec.containers[].resources.requests.memory) must be less than or equal to a node's allocatable memory for the pod to be scheduled. Since no node meets this requirement, the pod remains in Pending state.
What should I do if I get this CKAD 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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