This CKA practice question tests your understanding of workloads & 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.
A cluster administrator wants to ensure that no pods are scheduled on the master node(s). Which approach is the best practice?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Add a taint to the master node
The master node already has a NoSchedule taint by default.
Delete the master node from the cluster
Why wrong: This would remove the master, which is not practical.
Use a resource quota on the master namespace
Why wrong: Resource quotas do not prevent scheduling on specific nodes.
Set nodeSelector on the master node
Why wrong: nodeSelector is used on pods, not nodes.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Add a taint to the master node
Adding a taint to the master node(s) with the `node-role.kubernetes.io/master:NoSchedule` effect is the best practice because it prevents the Kubernetes scheduler from placing any pods on that node unless a pod explicitly tolerates the taint. This ensures that only critical system pods (which include the toleration) can run on the master, keeping it dedicated to cluster control plane operations.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Add a taint to the master node
Why this is correct
The master node already has a NoSchedule taint by default.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Delete the master node from the cluster
Why it's wrong here
This would remove the master, which is not practical.
Use a resource quota on the master namespace
Why it's wrong here
Resource quotas do not prevent scheduling on specific nodes.
Set nodeSelector on the master node
Why it's wrong here
nodeSelector is used on pods, not nodes.
Common exam traps
The trap here is that candidates often confuse `nodeSelector` (a pod scheduling constraint) with node-level restrictions, or think that deleting a node or using resource quotas can control scheduling to a specific node, when only taints (or node affinity with requiredDuringSchedulingIgnoredDuringExecution) provide that node-level control.
Detailed technical explanation
Taints and tolerations work via the Kubernetes scheduler's predicate logic: when a node has a taint, the scheduler filters out pods that do not have a matching toleration. The `NoSchedule` effect means the scheduler will never place a non-tolerating pod on that node, while `PreferNoSchedule` is a soft preference and `NoExecute` evicts existing pods. In practice, the `kubeadm` tool automatically applies the `node-role.kubernetes.io/master:NoSchedule` taint to master nodes during cluster initialization, and core control plane components (e.g., `kube-apiserver`, `etcd`) include the corresponding toleration in their pod specs.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Workloads & Scheduling — This question tests Workloads & Scheduling — Read the scenario before looking for a memorised answer..
The correct answer is: Add a taint to the master node — Adding a taint to the master node(s) with the `node-role.kubernetes.io/master:NoSchedule` effect is the best practice because it prevents the Kubernetes scheduler from placing any pods on that node unless a pod explicitly tolerates the taint. This ensures that only critical system pods (which include the toleration) can run on the master, keeping it dedicated to cluster control plane operations.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This CKA practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CKA exam.
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