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 mypod' and see the event: '0/3 nodes are available: 1 Insufficient memory, 2 Insufficient cpu'. The pod has resource requests defined. Which action would allow the pod to be scheduled?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Decrease the memory and CPU requests to fit within available node resources
The pod is unschedulable because the cluster's three nodes collectively lack sufficient CPU and memory to satisfy the pod's resource requests. Decreasing the memory and CPU requests to fit within the available node resources (option C) directly resolves the scheduling failure by making the pod's resource demands compatible with the remaining capacity on at least one node.
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.
✗
Increase the resource requests for the container
Why it's wrong here
Increasing requests would make the pod even more demanding, worsening the scheduling issue.
✗
Delete the pod and recreate it with the same spec
Why it's wrong here
Recreating the pod without changing the spec will result in the same Pending state.
✓
Decrease the memory and CPU requests to fit within available node resources
Why this is correct
This would make the pod schedulable on the existing nodes.
Related concept
Read the scenario before looking for a memorised answer.
✗
Decrease the CPU request but keep the memory request the same
Why it's wrong here
This would only address the CPU issue; memory is still insufficient.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that simply recreating the pod or adjusting only one resource dimension will fix scheduling issues, when in fact the scheduler evaluates all resource requests simultaneously against each node's allocatable capacity.
Detailed technical explanation
How to think about this question
The Kubernetes scheduler uses resource requests to determine node fit via a predicate called 'NodeResourcesFit'. When a pod's total requested CPU or memory exceeds a node's allocatable capacity, the scheduler marks that node as 'Insufficient cpu' or 'Insufficient memory'. The event shows two nodes lack CPU and one lacks memory, meaning the pod's requests exceed the combined available resources on any single node. Reducing requests to fit within the smallest node's allocatable resources is the only way to satisfy the scheduling constraints without adding nodes or removing other workloads.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: Decrease the memory and CPU requests to fit within available node resources — The pod is unschedulable because the cluster's three nodes collectively lack sufficient CPU and memory to satisfy the pod's resource requests. Decreasing the memory and CPU requests to fit within the available node resources (option C) directly resolves the scheduling failure by making the pod's resource demands compatible with the remaining capacity on at least one node.
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.
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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