Quick Answer
The answer is the kubectl cordon command. When a node displays the 'Ready,SchedulingDisabled' state after running kubectl get nodes, it means the node has been marked as unschedulable, which is exactly what kubectl cordon does—it prevents new pods from being scheduled onto that node while leaving existing workloads running. On the Certified Kubernetes Administrator CKA exam, this concept tests your understanding of node lifecycle management and pod scheduling controls, often appearing in scenarios where you need to safely drain or maintain a node without disrupting running applications. A common trap is confusing cordon with drain; remember that cordon only blocks new scheduling, while drain also evicts existing pods. For the CKA, a helpful memory tip is to think of a "cordon" as a police barrier that stops new traffic from entering but does not remove what is already inside.
This CKA practice question tests your understanding of cluster architecture, installation and configuration. 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.
An administrator runs 'kubectl get nodes' and sees that a worker node is in the 'Ready,SchedulingDisabled' state. Which command was most likely executed on that node?
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.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
kubectl drain node01
Why wrong: drain also evicts pods, but the node may show 'SchedulingDisabled' after cordon.
kubectl taint nodes node01 key=value:NoSchedule
Why wrong: Taints affect pod scheduling but do not set the node to 'SchedulingDisabled'.
kubectl cordon node01
cordon marks the node as unschedulable.
kubectl uncordon node01
Why wrong: uncordon removes the scheduling disablement.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
kubectl cordon node01
The 'Ready,SchedulingDisabled' state indicates the node has been marked as unschedulable using the 'kubectl cordon' command. Cordon marks the node as unschedulable, preventing new pods from being scheduled onto it while existing pods continue running. This matches the observed state exactly.
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.
kubectl drain node01
Why it's wrong here
drain also evicts pods, but the node may show 'SchedulingDisabled' after cordon.
kubectl taint nodes node01 key=value:NoSchedule
Why it's wrong here
Taints affect pod scheduling but do not set the node to 'SchedulingDisabled'.
kubectl cordon node01
Why this is correct
cordon marks the node as unschedulable.
Clue confirmation
The clue words "most likely", "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
kubectl uncordon node01
Why it's wrong here
uncordon removes the scheduling disablement.
Common exam traps
The trap here is confusing 'cordon' with 'drain' — candidates often think 'drain' is required to see 'SchedulingDisabled', but 'cordon' alone produces that state without evicting pods.
Trap categories for this question
Command / output trap
drain also evicts pods, but the node may show 'SchedulingDisabled' after cordon.
Detailed technical explanation
Under the hood, 'kubectl cordon' sets the 'spec.unschedulable' field to 'true' in the Node object, which the kube-scheduler checks before placing pods. A real-world scenario is performing node maintenance: cordoning prevents new workloads while allowing existing pods to drain gracefully, then uncordoning after maintenance restores scheduling. The 'SchedulingDisabled' suffix is a human-readable indicator of this field's state.
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
Cluster Architecture, Installation and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: kubectl cordon node01 — The 'Ready,SchedulingDisabled' state indicates the node has been marked as unschedulable using the 'kubectl cordon' command. Cordon marks the node as unschedulable, preventing new pods from being scheduled onto it while existing pods continue running. This matches the observed state exactly.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely", "which command". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 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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