Quick Answer
The answer is AWS CodeBuild, as it is the correct service to automate CloudFormation template validation in a CodeCommit pull request workflow. CodeBuild can be configured as a pre-merge check that runs a build project executing commands like `aws cloudformation validate-template` or `cfn-lint` against the template files in the pull request, blocking the merge if validation fails. This serverless, on-demand approach provides a lightweight validation gate without requiring a full CI/CD pipeline or provisioning any infrastructure. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of integrating CodeBuild as a quality gate within source control, often contrasting it with CodePipeline (which is for full orchestration) or Lambda (which lacks native pull request integration). A common trap is selecting CodePipeline because it can run validations, but the question specifically asks for a pre-merge check, which CodeBuild handles directly via CodeCommit’s triggers. Memory tip: think “Build before merge” — CodeBuild validates the template before the code is ever merged.
This DOP-C02 practice question tests your understanding of configuration management and iac. 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 uses AWS CodeCommit to store its infrastructure as code templates. The DevOps team wants to automatically validate CloudFormation templates before merging changes to the main branch. Which service should be used to implement this validation?
AWS CodeBuild
CodeBuild can run validation scripts as part of a pull request approval rule.
AWS CodeDeploy
Why wrong: CodeDeploy is for deploying applications, not validating templates.
AWS CodePipeline
Why wrong: CodePipeline orchestrates deployments but does not natively validate pull requests.
AWS CodeStar
Why wrong: CodeStar is a project management dashboard, not a validation tool.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
AWS CodeBuild
AWS CodeBuild is the correct service because it can be configured as a pre-merge check in a pull request workflow. By integrating CodeBuild with CodeCommit, the DevOps team can automatically run a build project that validates CloudFormation templates (e.g., using `aws cloudformation validate-template` or `cfn-lint`) before the merge is allowed. This provides a serverless, automated validation step without requiring a full pipeline or deployment.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
AWS CodeBuild
Why this is correct
CodeBuild can run validation scripts as part of a pull request approval rule.
Related concept
Read the scenario before looking for a memorised answer.
AWS CodeDeploy
Why it's wrong here
CodeDeploy is for deploying applications, not validating templates.
AWS CodePipeline
Why it's wrong here
CodePipeline orchestrates deployments but does not natively validate pull requests.
AWS CodeStar
Why it's wrong here
CodeStar is a project management dashboard, not a validation tool.
Common exam traps
The trap here is that candidates often confuse CodePipeline's orchestration capabilities with the need for a simple pre-merge validation, overlooking that CodeBuild can be directly triggered by CodeCommit pull request events without a full pipeline.
Detailed technical explanation
Under the hood, CodeBuild can be triggered by CodeCommit pull request events via Amazon EventBridge rules or repository notifications. The buildspec.yml can include a phase that runs `aws cloudformation validate-template --template-body file://template.yaml` to check for syntax errors, missing parameters, or circular dependencies. A real-world scenario where this matters is when a team uses nested stacks or transforms (e.g., AWS SAM) — CodeBuild can also run `cfn-lint` to enforce organizational policies before the template is merged.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
The correct answer is: AWS CodeBuild — AWS CodeBuild is the correct service because it can be configured as a pre-merge check in a pull request workflow. By integrating CodeBuild with CodeCommit, the DevOps team can automatically run a build project that validates CloudFormation templates (e.g., using `aws cloudformation validate-template` or `cfn-lint`) before the merge is allowed. This provides a serverless, automated validation step without requiring a full pipeline or deployment.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This DOP-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DOP-C02 exam.
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