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.
Which THREE of the following are valid ways to restrict or influence pod scheduling using taints and tolerations? (Select THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Adding a taint with effect NoSchedule to a node
Adding a taint with effect NoSchedule to a node tells the Kubernetes scheduler not to schedule any pods onto that node unless they have a matching toleration. This is a core use of taints and tolerations to restrict pod placement, making option A correct.
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.
✓
Adding a taint with effect NoSchedule to a node
Why this is correct
Pods without the matching toleration will not be scheduled on that node.
Related concept
Read the scenario before looking for a memorised answer.
✗
Adding a toleration to a pod to prevent it from being scheduled on certain nodes
Why it's wrong here
Tolerations allow scheduling on tainted nodes, they do not prevent scheduling.
✓
Adding a taint with effect PreferNoSchedule to a node
Why this is correct
The scheduler will try to avoid scheduling pods without the toleration, but it is not guaranteed.
Related concept
Read the scenario before looking for a memorised answer.
✗
Applying a nodeSelector to a pod to match node labels
Why it's wrong here
nodeSelector is a scheduling constraint, not part of taints/tolerations.
✓
Adding a taint with effect NoExecute to a node
Why this is correct
Existing pods that do not tolerate the taint will be evicted.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse tolerations as a way to repel pods from nodes, when in fact tolerations allow pods to be scheduled onto tainted nodes, while taints themselves repel pods.
Detailed technical explanation
How to think about this question
Taints and tolerations work by marking a node with a taint (e.g., key=value:NoSchedule) and then adding a matching toleration to a pod (e.g., tolerations: - key: "key", operator: "Equal", value: "value", effect: "NoSchedule"). The scheduler checks for taints during pod scheduling; if no toleration matches, the pod is not placed on that node. The NoExecute effect additionally evicts any running pods that do not tolerate the taint, which is useful for node maintenance scenarios.
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: Adding a taint with effect NoSchedule to a node — Adding a taint with effect NoSchedule to a node tells the Kubernetes scheduler not to schedule any pods onto that node unless they have a matching toleration. This is a core use of taints and tolerations to restrict pod placement, making option A correct.
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.
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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