- A
Create a buildspec file that includes a sleep command to stagger start times.
Why wrong: Does not prevent overlap; just delays.
- B
Configure the CodeBuild project with a concurrent build limit of 1.
Why wrong: CodeBuild does support setting a concurrent build limit per project. However, with hundreds of jobs, you would need separate projects for each job to set individual limits. This approach does not coordinate across projects, so two jobs from different projects could still run simultaneously. Therefore, it does not ensure no overlapping builds.
- C
Set up a separate CodeBuild project for each job and use a custom retry policy.
Why wrong: Different projects do not prevent overlap within same job.
- D
Use Amazon CloudWatch Events to trigger a Lambda function that checks the build status before starting a new build.
Lambda can check and prevent overlapping builds.
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is migrating from Jenkins to AWS CodeBuild. They have hundreds of Jenkins jobs that run on a schedule. Some jobs take hours and must not overlap. What is the most efficient way to migrate these jobs to CodeBuild while ensuring no overlapping builds?
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
Use Amazon CloudWatch Events to trigger a Lambda function that checks the build status before starting a new build.
Option D is correct because it provides a robust, event-driven mechanism to prevent overlapping builds. By using Amazon CloudWatch Events to trigger a Lambda function that checks the current build status of the CodeBuild project before starting a new build, you can ensure that a new build is only initiated when no other build is running. This approach directly addresses the requirement that some jobs take hours and must not overlap, without relying on fragile timing or configuration limits that may not apply across multiple projects.
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.
- ✗
Create a buildspec file that includes a sleep command to stagger start times.
Why it's wrong here
Does not prevent overlap; just delays.
- ✗
Configure the CodeBuild project with a concurrent build limit of 1.
Why it's wrong here
CodeBuild does support setting a concurrent build limit per project. However, with hundreds of jobs, you would need separate projects for each job to set individual limits. This approach does not coordinate across projects, so two jobs from different projects could still run simultaneously. Therefore, it does not ensure no overlapping builds.
- ✗
Set up a separate CodeBuild project for each job and use a custom retry policy.
Why it's wrong here
Different projects do not prevent overlap within same job.
- ✓
Use Amazon CloudWatch Events to trigger a Lambda function that checks the build status before starting a new build.
Why this is correct
Lambda can check and prevent overlapping builds.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common mistake is to assume that setting a concurrent build limit of 1 per CodeBuild project prevents overlapping builds. However, with hundreds of jobs, you would need separate projects (one per job) to apply individual limits. This does not coordinate across projects, so two jobs from different projects could still run simultaneously. Option D correctly uses centralized orchestration via CloudWatch Events and Lambda to ensure only one build runs at a time across all jobs.
Detailed technical explanation
How to think about this question
Under the hood, CodeBuild uses a queue and a concurrency limit per project, but this limit does not coordinate across projects. The Lambda function in option D can use the AWS SDK to call the BatchGetBuilds or ListBuilds API to check for any builds in the IN_PROGRESS state before triggering a new build via StartBuild. This pattern is a common implementation of a distributed mutex using AWS services, ensuring that even if multiple CloudWatch Events fire at the same time, only one build proceeds.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Amazon CloudWatch Events to trigger a Lambda function that checks the build status before starting a new build. — Option D is correct because it provides a robust, event-driven mechanism to prevent overlapping builds. By using Amazon CloudWatch Events to trigger a Lambda function that checks the current build status of the CodeBuild project before starting a new build, you can ensure that a new build is only initiated when no other build is running. This approach directly addresses the requirement that some jobs take hours and must not overlap, without relying on fragile timing or configuration limits that may not apply across multiple projects.
What should I do if I get this DOP-C02 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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Last reviewed: Jul 4, 2026
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