Quick Answer
The correct answers are that a node can have multiple taints with different effects, and tolerations allow pods to schedule on tainted nodes. Taints are applied to nodes to repel pods that do not have a matching toleration, with effects like NoSchedule, PreferNoSchedule, or NoExecute controlling whether the pod is blocked, avoided, or evicted. Tolerations, placed on pods, act as an override that permits scheduling on tainted nodes, but they do not guarantee placement—scheduling still respects other constraints like node affinity. On the CKA exam, this concept tests your understanding of how to isolate workloads or dedicate nodes, often appearing in multi-part scenarios where a pod must tolerate a specific taint to land on a reserved node. A common trap is confusing tolerations with node selectors: tolerations allow, they do not force. Memory tip: think of taints as a “keep out” sign on the node, and tolerations as the pod’s “permission badge” to enter.
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.
Which TWO are true about taints and tolerations? (Select 2)
Taints prevent all pods from scheduling on a node
Why wrong: Only those without toleration.
A node can have multiple taints
Yes.
Taints are applied to pods
Why wrong: Taints are on nodes.
Tolerations are set on nodes
Why wrong: Pods have tolerations.
Tolerations allow pods to schedule on tainted nodes
Correct.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
A node can have multiple taints
Option B is correct because a node can indeed have multiple taints applied to it, each with different effects (NoSchedule, PreferNoSchedule, or NoExecute). This allows fine-grained control over pod placement, such as dedicating nodes for specific workloads or isolating sensitive pods. Option E is correct because tolerations are applied to pods and allow them to be scheduled on nodes that have matching taints, effectively overriding the taint's restriction.
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.
Taints prevent all pods from scheduling on a node
Why it's wrong here
Only those without toleration.
A node can have multiple taints
Why this is correct
Yes.
Related concept
Read the scenario before looking for a memorised answer.
Taints are applied to pods
Why it's wrong here
Taints are on nodes.
Tolerations are set on nodes
Why it's wrong here
Pods have tolerations.
Tolerations allow pods to schedule on tainted nodes
Why this is correct
Correct.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse which object (node vs. pod) receives taints versus tolerations, leading them to incorrectly select options C or D.
Detailed technical explanation
Taints and tolerations work together as a mechanism to control pod placement based on node characteristics. When a node has a taint with effect NoSchedule, the Kubernetes scheduler will not schedule a pod onto that node unless the pod has a matching toleration. The NoExecute effect additionally evicts existing pods that do not tolerate the taint. This is commonly used in multi-tenant clusters to isolate workloads or to reserve nodes for critical system components.
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
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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: A node can have multiple taints — Option B is correct because a node can indeed have multiple taints applied to it, each with different effects (NoSchedule, PreferNoSchedule, or NoExecute). This allows fine-grained control over pod placement, such as dedicating nodes for specific workloads or isolating sensitive pods. Option E is correct because tolerations are applied to pods and allow them to be scheduled on nodes that have matching taints, effectively overriding the taint's restriction.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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