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.
You have a CronJob that runs every 5 minutes. The previous job is still running when the next scheduled time arrives. You want the new job to be skipped if the previous one is still running. Which concurrencyPolicy should you set?
Skip
Why wrong: Skip is not a valid concurrencyPolicy value.
Allow
Why wrong: Allow permits concurrent runs, which is not what you want.
Replace
Why wrong: Replace would kill the existing job and start a new one, not skip.
Forbid
Forbid skips the new job if the previous one is still running, meeting the requirement.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Forbid
Option B is correct. concurrencyPolicy: Forbid prevents a new job from starting if the previous one hasn't finished. Allow would start another instance concurrently; Replace would terminate the running job and start a new one.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Skip
Why it's wrong here
Skip is not a valid concurrencyPolicy value.
Allow
Why it's wrong here
Allow permits concurrent runs, which is not what you want.
Replace
Why it's wrong here
Replace would kill the existing job and start a new one, not skip.
Forbid
Why this is correct
Forbid skips the new job if the previous one is still running, meeting the requirement.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
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.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CKAD NAT questions on configuration and troubleshooting.
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FAQ
Application Design and Build — This question tests Application Design and Build — Static NAT maps one inside address to one outside address..
The correct answer is: Forbid — Option B is correct. concurrencyPolicy: Forbid prevents a new job from starting if the previous one hasn't finished. Allow would start another instance concurrently; Replace would terminate the running job and start a new one.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CKAD NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
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