CKAD Application Observability and Maintenance Practice Question
This CKAD practice question tests your understanding of application observability and maintenance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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' and see '0/1 nodes are available: 1 Insufficient cpu, 1 Insufficient memory.' What does this mean?
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 available resources on any node
The 'Pending' state indicates the pod has been accepted by the Kubernetes API server but cannot be scheduled onto a node. The message '0/1 nodes are available: 1 Insufficient cpu, 1 Insufficient memory' means the scheduler evaluated all nodes and found that none had enough allocatable CPU and memory to satisfy the pod's resource requests. This is a scheduling failure caused by the pod's requests exceeding the available resources on any 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.
✗
The container image is not available
Why it's wrong here
That would cause ImagePullBackOff, not Pending.
✗
The liveness probe is failing
Why it's wrong here
Liveness probe failures occur after the container starts, not before scheduling.
✓
The pod's resource requests exceed available resources on any node
Why this is correct
The scheduler found no node with enough CPU and memory to satisfy the pod's requests.
Related concept
Read the scenario before looking for a memorised answer.
✗
The container is crashing due to an error
Why it's wrong here
Crashing would cause CrashLoopBackOff, not Pending.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between pod lifecycle phases (Pending, Running, CrashLoopBackOff) and the specific error messages in 'kubectl describe pod', leading candidates to confuse scheduling failures with runtime issues like image pull errors or probe failures.
Detailed technical explanation
How to think about this question
The Kubernetes scheduler uses a predicate phase to filter nodes that can satisfy a pod's resource requests (CPU and memory), then a priority phase to rank remaining nodes. Resource requests are guaranteed at the container level and summed for the pod; if a node's allocatable resources minus the sum of requests of all running pods is less than the pod's requests, the node is marked as 'Insufficient cpu' or 'Insufficient memory'. This is distinct from resource limits, which are not used for scheduling decisions but for throttling/OOM killing at runtime.
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 Observability and Maintenance — This question tests Application Observability and Maintenance — 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 available resources on any node — The 'Pending' state indicates the pod has been accepted by the Kubernetes API server but cannot be scheduled onto a node. The message '0/1 nodes are available: 1 Insufficient cpu, 1 Insufficient memory' means the scheduler evaluated all nodes and found that none had enough allocatable CPU and memory to satisfy the pod's resource requests. This is a scheduling failure caused by the pod's requests exceeding the available resources on any 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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