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 stuck in Pending state. You run 'kubectl describe pod my-pod' and see the event: '0/4 nodes are available: 1 Insufficient cpu, 3 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 resource requests exceed the available node resources
The event '0/4 nodes are available: 1 Insufficient cpu, 3 Insufficient memory' indicates that the Kubernetes scheduler could not find any node that satisfies the pod's resource requests. The pod's resource requests (spec.containers[].resources.requests) define the minimum CPU and memory the pod requires to run. If the sum of requests across all pods on a node exceeds the node's allocatable resources, the scheduler marks the node as unschedulable for that pod, leaving it 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 resource requests exceed the available node resources
Why this is correct
The scheduler cannot place the pod because no node has enough free resources to satisfy the requests.
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 uses too many secrets
Why it's wrong here
Secrets do not affect scheduling.
✗
The pod's resource limits are too low
Why it's wrong here
Limits are not used for scheduling; only requests are considered. Low limits would not cause Pending.
✗
The pod's container is failing health checks
Why it's wrong here
Health check failures would cause CrashLoopBackOff, not Pending state.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse resource requests with resource limits, thinking that low limits cause scheduling failures, but Kubernetes only uses requests for scheduling decisions, not limits.
Detailed technical explanation
How to think about this question
The Kubernetes scheduler uses a two-phase process: filtering (finding nodes that meet the pod's resource requests) and scoring (ranking nodes). The 'Insufficient cpu' and 'Insufficient memory' messages come from the predicate 'NodeResourcesFit' which checks if the node has enough allocatable resources minus the sum of requests from existing pods. A subtle behavior is that if a pod has no resource requests set, the scheduler assumes zero requests, but the node's kubelet may still enforce limits via cgroups; however, the scheduler will not reject the pod for insufficient resources in that case.
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 resource requests exceed the available node resources — The event '0/4 nodes are available: 1 Insufficient cpu, 3 Insufficient memory' indicates that the Kubernetes scheduler could not find any node that satisfies the pod's resource requests. The pod's resource requests (spec.containers[].resources.requests) define the minimum CPU and memory the pod requires to run. If the sum of requests across all pods on a node exceeds the node's allocatable resources, the scheduler marks the node as unschedulable for that pod, leaving it 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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