KCNA Kubernetes Fundamentals Practice Question
A platform engineer needs to run a one-time batch job that processes a dataset and then exits. The job must run exactly once and not be restarted if it completes successfully. Which Kubernetes resource should be used?
⚠ Common exam trap
It's easy for candidates to confuse a Job with a CronJob; a CronJob is for scheduled recurring tasks, not a single immediate execution.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Job
A Job is the correct resource for run-to-completion workloads. It creates Pods that are expected to terminate successfully, and it does not restart them after successful completion. Deployments, CronJobs, and DaemonSets are designed for different use cases: long-running services, scheduled tasks, and node-level agents, respectively.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
DaemonSet
Why it's wrong here
A DaemonSet ensures that a copy of a Pod runs on all (or some) nodes, typically for cluster-wide services like log collectors or node monitors. It does not support run-to-completion semantics and would keep restarting the Pod, which is inappropriate for a one-time batch job.
- ✗
CronJob
Why it's wrong here
A CronJob is used to run Jobs on a scheduled basis, such as daily or hourly. While it creates Jobs, it is not suitable for a single, immediate one-time execution because it requires a schedule and would trigger the job multiple times according to that schedule.
- ✗
Deployment
Why it's wrong here
A Deployment manages long-running, stateless applications and maintains a desired number of replicas. It is not intended for batch workloads that terminate; if a Pod exits, the Deployment's ReplicaSet will replace it, causing the job to run repeatedly instead of once.
- ✓
Job
Why this is correct
A Job creates one or more Pods and ensures that a specified number of them successfully terminate. It is designed for run-to-completion workloads. By default, it does not restart Pods after successful completion, making it ideal for a one-time batch process that must finish and exit.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CNCF exam blueprint
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