The answer is an AWS CodeBuild project with a webhook configured and Amazon CloudWatch Events (now Amazon EventBridge) as the event source. This combination works because EventBridge captures CodeCommit pull request state changes—such as when a pull request is created or updated—and routes those events directly to CodeBuild, eliminating the need for polling. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of event-driven automation versus manual triggers; a common trap is selecting SNS or Lambda as the sole trigger, but EventBridge is the native service for routing repository events. Remember that CodeCommit does not natively support webhooks for pull requests the way GitHub does, so EventBridge acts as the bridge. Memory tip: think “EventBridge bridges the PR event to the build.”
DOP-C02 Configuration Management and IaC Practice Question
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 source code. The development team wants to automatically trigger a build in AWS CodeBuild whenever a pull request is created or updated. Which TWO resources must be configured to accomplish this? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
An Amazon CloudWatch Events rule that listens for CodeCommit pull request events.
Option C is correct because Amazon CloudWatch Events (now Amazon EventBridge) can capture CodeCommit pull request state changes (e.g., created, updated) and route them to targets like AWS CodeBuild. This allows you to automatically trigger a build when a pull request event occurs, without needing a separate polling mechanism.
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.
✗
An AWS Lambda function to process the pull request event.
Why it's wrong here
Lambda is not required; CloudWatch Events can directly target CodeBuild.
✗
An AWS CodePipeline pipeline with a source stage for CodeCommit.
Why it's wrong here
CodePipeline is an alternative, but not required for simple trigger.
✓
An Amazon CloudWatch Events rule that listens for CodeCommit pull request events.
Why this is correct
EventBridge can trigger a build on pull request events.
Related concept
Read the scenario before looking for a memorised answer.
✗
An Amazon Simple Notification Service (SNS) topic to send notifications.
Why it's wrong here
SNS is optional for notifications, not required for triggering the build.
✓
An AWS CodeBuild project with a webhook configured.
Why this is correct
The CodeBuild project can receive events from the webhook triggered by CloudWatch Events.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think they need a Lambda function or CodePipeline to bridge the event, but AWS natively supports direct event-driven triggers from CodeCommit to CodeBuild via CloudWatch Events and webhooks.
Detailed technical explanation
How to think about this question
Under the hood, CodeCommit emits events to Amazon EventBridge (formerly CloudWatch Events) for pull request actions like 'created' and 'updated'. You configure a rule with an event pattern matching the specific CodeCommit source and detail-type, then set the target to the CodeBuild project. The webhook on the CodeBuild project (Option E) is the second required resource because it listens for the 'PULL_REQUEST_CREATED' and 'PULL_REQUEST_UPDATED' events from CodeCommit, enabling CodeBuild to start a build automatically. In real-world scenarios, this setup avoids the latency and cost of polling, and it supports branch-specific triggers via filter groups.
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.
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.
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: An Amazon CloudWatch Events rule that listens for CodeCommit pull request events. — Option C is correct because Amazon CloudWatch Events (now Amazon EventBridge) can capture CodeCommit pull request state changes (e.g., created, updated) and route them to targets like AWS CodeBuild. This allows you to automatically trigger a build when a pull request event occurs, without needing a separate polling mechanism.
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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Question Discussion
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