This CKA practice question tests your understanding of workloads and scheduling. 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.
You have a DaemonSet that runs on all nodes. You need to ensure it does NOT run on a node labeled 'disk=ssd'. Which field in the DaemonSet spec should you use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "NOT"
Why it matters: Negative qualifier — you are looking for the one option that does NOT apply. Most options will be true; only one is false for this scenario.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
spec.template.spec.affinity.nodeAffinity.requiredDuringSchedulingIgnoredDuringExecution with NotIn operator
Option A is correct because `nodeAffinity.requiredDuringSchedulingIgnoredDuringExecution` with the `NotIn` operator allows you to specify that the DaemonSet pod must not be scheduled on nodes with the label `disk=ssd`. This is the proper way to express an anti-affinity rule that excludes nodes based on a label value, ensuring the DaemonSet runs on all nodes except those with `disk=ssd`.
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.
✓
spec.template.spec.affinity.nodeAffinity.requiredDuringSchedulingIgnoredDuringExecution with NotIn operator
Why this is correct
This anti-affinity rule ensures pods are not scheduled on nodes with disk=ssd.
Clue confirmation
The clue word "NOT" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
spec.template.spec.nodeSelector with disk: ssd
Why it's wrong here
This would select nodes with disk=ssd, the opposite of the requirement.
✗
spec.template.spec.tolerations with key disk value ssd
Why it's wrong here
Tolerations allow scheduling on tainted nodes; they are not used to prevent scheduling based on labels.
✗
spec.updateStrategy.rollingUpdate.maxUnavailable
Why it's wrong here
This controls the rolling update behavior, not scheduling.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `nodeSelector` (which selects nodes to include) with the need to exclude nodes, and they may incorrectly choose `nodeSelector` with a negative label value, not realizing that `nodeSelector` only supports equality-based inclusion, not exclusion.
Detailed technical explanation
How to think about this question
Under the hood, `nodeAffinity` is evaluated by the Kubernetes scheduler during pod placement, and `requiredDuringSchedulingIgnoredDuringExecution` is a hard constraint that must be satisfied for the pod to be scheduled. The `NotIn` operator matches nodes where the label value is not in the specified set, effectively excluding nodes with `disk=ssd`. This is part of the `affinity` field in the pod spec, which provides more expressive scheduling rules than `nodeSelector`, including support for operators like `In`, `NotIn`, `Exists`, and `DoesNotExist`.
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 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.
Workloads and Scheduling — This question tests Workloads and Scheduling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: spec.template.spec.affinity.nodeAffinity.requiredDuringSchedulingIgnoredDuringExecution with NotIn operator — Option A is correct because `nodeAffinity.requiredDuringSchedulingIgnoredDuringExecution` with the `NotIn` operator allows you to specify that the DaemonSet pod must not be scheduled on nodes with the label `disk=ssd`. This is the proper way to express an anti-affinity rule that excludes nodes based on a label value, ensuring the DaemonSet runs on all nodes except those with `disk=ssd`.
What should I do if I get this CKA 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: "NOT". Negative qualifier — you are looking for the one option that does NOT apply. Most options will be true; only one is false for this scenario.
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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