CKA Practice Question: Cluster Architecture, Installation & Configuration
This CKA practice question tests your understanding of cluster architecture, installation & configuration. 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.
Exhibit
```
$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready control-plane,master 10d v1.28.0
node1 Ready <none> 10d v1.28.0
node2 Ready <none> 10d v1.28.0
node3 Ready <none> 10d v1.28.0
$ kubectl describe pod nginx-pod
Name: nginx-pod
Namespace: default
Priority: 0
Node: node1/192.168.1.101
Start Time: Mon, 01 Jan 2024 12:00:00 +0000
Labels: run=nginx
Annotations: <none>
Status: Pending
IP:
IPs: <none>
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Warning FailedScheduling 2m default-scheduler 0/4 nodes are available: 1 node(s) had untolerated taint {node.kubernetes.io/not-ready: }, 3 node(s) had untolerated taint {node.kubernetes.io/unreachable: }. preemption: 0/4 nodes are available: 4 Preemption is not helpful for scheduling.
```
Refer to the exhibit. A pod named nginx-pod is stuck in Pending state. Based on the describe output, 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
✓
All nodes have taints that the pod does not tolerate.
The pod cannot be scheduled because all nodes have taints that the pod does not tolerate. The events show both 'not-ready' and 'unreachable' taints. However, 'kubectl get nodes' shows all nodes as Ready. This suggests a mismatch: the node conditions may have changed after the pod was created, or the scheduler's cache is stale. But the immediate reason is the taints.
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 available capacity.
Why it's wrong here
Incorrect. The event message does not mention insufficient resources; it specifically points to taints.
✓
All nodes have taints that the pod does not tolerate.
Why this is correct
Correct. The event message explicitly states that all nodes have untolerated taints, preventing scheduling.
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 node selector that doesn't match any node.
Why it's wrong here
Incorrect. The describe output does not show any node selector, and the events mention taints, not node selector mismatches.
✗
The scheduler is not running properly.
Why it's wrong here
Incorrect. The scheduler is running (it produces events), but it cannot find a suitable node.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
Incorrect. The describe output does not show any node selector, and the events mention taints, not node selector mismatches.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 CKA 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 CKA question in full detail.
Identify which CKA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Cluster Architecture, Installation & Configuration — This question tests Cluster Architecture, Installation & Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: All nodes have taints that the pod does not tolerate. — The pod cannot be scheduled because all nodes have taints that the pod does not tolerate. The events show both 'not-ready' and 'unreachable' taints. However, 'kubectl get nodes' shows all nodes as Ready. This suggests a mismatch: the node conditions may have changed after the pod was created, or the scheduler's cache is stale. But the immediate reason is the taints.
What should I do if I get this CKA question wrong?
Identify which CKA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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