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 a set of batch processing Pods are preemptible and should not cause disruption to other critical workloads. Which combination of scheduling features should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Assign a low priority class to the batch Pods and set a PodDisruptionBudget for critical workloads.
Option B is correct because assigning a low priority class to batch Pods ensures they are preempted by higher-priority critical workloads when resources are scarce, while a PodDisruptionBudget (PDB) for critical workloads guarantees that a minimum number of those Pods remain available during voluntary disruptions (e.g., node drains). This combination allows batch Pods to be preemptible without causing disruption to critical workloads, aligning with the requirement.
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.
✗
Taint all worker nodes with a custom taint and add tolerations to batch Pods.
Why it's wrong here
Taints/tolerations control scheduling but not preemption behavior.
✓
Assign a low priority class to the batch Pods and set a PodDisruptionBudget for critical workloads.
Why this is correct
Low priority allows preemption, and PDB prevents excessive disruption to critical Pods.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use nodeAffinity to schedule batch Pods on dedicated nodes.
Why it's wrong here
Node affinity does not provide preemption or disruption protection.
✗
Use resource quotas to limit the batch Pods' resource consumption.
Why it's wrong here
Resource quotas limit usage but do not affect scheduling priority or disruption.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse taints/tolerations or node affinity with preemption and disruption protection, failing to realize that only priority classes enable preemption and PDBs control voluntary disruptions.
Detailed technical explanation
How to think about this question
Priority classes in Kubernetes use a PriorityClass object with a numeric value; when the scheduler preempts Pods, it evicts lower-priority Pods to accommodate higher-priority ones, and the preempted Pods are terminated gracefully (subject to terminationGracePeriodSeconds). A PodDisruptionBudget (PDB) uses a selector and minAvailable or maxUnavailable to limit voluntary disruptions; it does not prevent involuntary disruptions (e.g., node crashes) but ensures that during operations like node drains, the specified number of Pods remain running. In practice, combining a low priority class with a PDB for critical workloads ensures that batch Pods are evicted first under resource pressure, while critical workloads maintain availability during planned maintenance.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKA question in full detail.
Workloads & Scheduling — This question tests Workloads & Scheduling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Assign a low priority class to the batch Pods and set a PodDisruptionBudget for critical workloads. — Option B is correct because assigning a low priority class to batch Pods ensures they are preempted by higher-priority critical workloads when resources are scarce, while a PodDisruptionBudget (PDB) for critical workloads guarantees that a minimum number of those Pods remain available during voluntary disruptions (e.g., node drains). This combination allows batch Pods to be preemptible without causing disruption to critical workloads, aligning with the requirement.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.