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 company runs a batch job that processes a queue. The job should run to completion exactly once. Which resource should be used?
Job
A Job runs until completion and is suitable for batch processing.
DaemonSet
Why wrong: DaemonSets run a Pod on each node.
CronJob
Why wrong: CronJobs run on a schedule, not exactly once.
Deployment
Why wrong: Deployments maintain a desired number of replicas running continuously.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Job
A Kubernetes Job is designed to run a specified number of pods to successful completion. When the pod exits with a zero exit code, the Job is marked as complete and will not be restarted, making it the correct choice for a batch job that must run exactly once.
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.
Job
Why this is correct
A Job runs until completion and is suitable for batch processing.
Related concept
Read the scenario before looking for a memorised answer.
DaemonSet
Why it's wrong here
DaemonSets run a Pod on each node.
CronJob
Why it's wrong here
CronJobs run on a schedule, not exactly once.
Deployment
Why it's wrong here
Deployments maintain a desired number of replicas running continuously.
Common exam traps
The trap here is that candidates often confuse a CronJob with a Job, thinking that a CronJob can also run a one-time task, but CronJob is specifically for scheduled, recurring execution, not a single run-to-completion workload.
Detailed technical explanation
Under the hood, a Job controller tracks pod completions via the `status.succeeded` field and can be configured with `spec.completions` and `spec.parallelism` to control how many successful completions are required. A subtle behavior is that if the pod fails (non-zero exit), the Job controller will restart the pod by default (unless `spec.backoffLimit` is set to 0), which can cause the job to run more than once if not configured carefully — for strict 'exactly once' semantics, you must also consider idempotency in the application logic.
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
Workloads & Scheduling — This question tests Workloads & Scheduling — Read the scenario before looking for a memorised answer..
The correct answer is: Job — A Kubernetes Job is designed to run a specified number of pods to successful completion. When the pod exits with a zero exit code, the Job is marked as complete and will not be restarted, making it the correct choice for a batch job that must run exactly once.
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 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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