CKAD Application Design and Build Practice Question
This CKAD practice question tests your understanding of application design and build. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 of the following are valid fields in a CronJob spec? (Select 2)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
concurrencyPolicy
B is correct because `concurrencyPolicy` is a valid field in a CronJob spec that controls how concurrent executions of the job are handled. It can be set to `Allow`, `Forbid`, or `Replace`, which determines whether a new job can start while a previous one is still running.
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.
✗
restartPolicy
Why it's wrong here
restartPolicy is a Pod spec field, not a CronJob field.
✓
concurrencyPolicy
Why this is correct
Correct: concurrencyPolicy controls how concurrent runs are handled (Allow, Forbid, Replace).
Related concept
Read the scenario before looking for a memorised answer.
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completions
Why it's wrong here
completions is a field of the Job template, not the CronJob.
✓
schedule
Why this is correct
Correct: schedule defines the cron expression.
Related concept
Read the scenario before looking for a memorised answer.
✗
parallelism
Why it's wrong here
parallelism is a field of the Job template inside the CronJob, not a top-level CronJob field.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between CronJob spec fields and Job spec fields, trapping candidates who confuse `completions` and `parallelism` (Job-level) with CronJob-level fields like `schedule` and `concurrencyPolicy`.
Detailed technical explanation
How to think about this question
Under the hood, a CronJob creates a Job object for each scheduled run, and the CronJob controller manages the lifecycle of these Jobs. The `concurrencyPolicy` field is crucial in production to prevent overlapping job runs when a job takes longer than the cron interval, with `Forbid` being the safest choice for idempotent workloads. Real-world scenarios often use `Replace` for cleanup jobs to ensure only the latest run is active.
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 practitioner preparing for the CKAD 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKAD question in full detail.
Application Design and Build — This question tests Application Design and Build — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: concurrencyPolicy — B is correct because `concurrencyPolicy` is a valid field in a CronJob spec that controls how concurrent executions of the job are handled. It can be set to `Allow`, `Forbid`, or `Replace`, which determines whether a new job can start while a previous one is still running.
What should I do if I get this CKAD 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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