This KCNA practice question tests your understanding of container orchestration. 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.
You need to run a batch job that processes data every hour and exits upon completion. Which Kubernetes resource should you use?
Why wrong: Deployments are for long-running stateless services.
B
Job
A Job runs a pod until successful completion.
C
DaemonSet
Why wrong: DaemonSet runs a pod on every node.
D
CronJob
Why wrong: CronJob is for scheduled jobs; the question says 'every hour', but it specifically says 'runs every hour and exits' – a CronJob is appropriate, but the option is not listed; however Job is the building block. Since CronJob is not listed, Job is the correct core resource.
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 Kubernetes resource because it is designed to run a finite task to completion, such as a batch job that processes data every hour and then exits. Unlike a Deployment, which maintains a desired number of continuously running Pods, a Job ensures that a specified number of Pods successfully terminate, making it ideal for one-off or scheduled batch workloads.
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.
✗
Deployment
Why it's wrong here
Deployments are for long-running stateless services.
✓
Job
Why this is correct
A Job runs a pod until successful completion.
Related concept
Read the scenario before looking for a memorised answer.
✗
DaemonSet
Why it's wrong here
DaemonSet runs a pod on every node.
✗
CronJob
Why it's wrong here
CronJob is for scheduled jobs; the question says 'every hour', but it specifically says 'runs every hour and exits' – a CronJob is appropriate, but the option is not listed; however Job is the building block. Since CronJob is not listed, Job is the correct core resource.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between a CronJob (the scheduler) and a Job (the actual workload), so candidates mistakenly choose CronJob because the question mentions 'every hour', but the resource that runs and exits is the Job, not the CronJob.
Detailed technical explanation
How to think about this question
Under the hood, a Job creates one or more Pods and tracks their successful completion via the `.status.succeeded` field; once the specified number of completions is reached, the Job is marked as finished and no further Pods are created. A subtle behavior is that if a Pod fails, the Job controller will automatically restart it (depending on the `restartPolicy`, which must be `OnFailure` or `Never`), and by default, Jobs do not have a deadline unless a `activeDeadlineSeconds` is set. In a real-world scenario, a data processing pipeline might use a CronJob to trigger a Job every hour, where the Job itself runs a container that processes a batch of files and then exits, ensuring no resource waste from idle Pods.
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 KCNA question in full detail.
Container Orchestration — This question tests Container Orchestration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Job — A Job is the correct Kubernetes resource because it is designed to run a finite task to completion, such as a batch job that processes data every hour and then exits. Unlike a Deployment, which maintains a desired number of continuously running Pods, a Job ensures that a specified number of Pods successfully terminate, making it ideal for one-off or scheduled batch workloads.
What should I do if I get this KCNA 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.
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Question Discussion
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