The answer is to configure a CodeCommit repository trigger that invokes a Lambda function, which then starts a CodeBuild build. This approach is correct because CodeCommit does not natively support direct webhook integration with CodeBuild for all branch pushes; instead, you must use an event-driven pattern where a Lambda function acts as the intermediary, receiving the push notification from the repository and programmatically calling the StartBuild API. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of event-driven CI/CD orchestration and the limitations of native service integrations—a common trap is assuming CodeBuild can directly subscribe to CodeCommit events without a custom trigger. Remember, polling is inefficient and scheduled builds ignore push events entirely, so the Lambda-based trigger is the only way to achieve real-time, branch-agnostic builds. Memory tip: "Push to Lambda, Lambda to Build" keeps the chain clear.
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 development team is using AWS CodeCommit as the source for a CI/CD pipeline. They want to automatically trigger a build in AWS CodeBuild whenever a developer pushes changes to any branch in the repository. Which pipeline configuration should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a CodeCommit repository trigger to invoke a Lambda function that starts a CodeBuild build
Option B is correct because using a webhook that triggers on all branch pushes is the simplest and most direct way to achieve automatic builds on every push. Option A is wrong because polling is less efficient and introduces latency. Option C is wrong because event rules require event bus setup and are more complex. Option D is wrong because scheduled builds do not respond to pushes.
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.
✗
Configure CodePipeline to poll the CodeCommit repository every minute
Why it's wrong here
Polling is inefficient and not real-time.
✗
Use Amazon EventBridge to capture CodeCommit events and start a CodePipeline execution
Why it's wrong here
More complex than necessary; triggers are simpler.
✗
Set up a scheduled CodePipeline execution using Amazon CloudWatch Events
Why it's wrong here
Scheduled builds do not respond to code pushes.
✓
Configure a CodeCommit repository trigger to invoke a Lambda function that starts a CodeBuild build
Why this is correct
Triggers provide immediate response to pushes.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Configure a CodeCommit repository trigger to invoke a Lambda function that starts a CodeBuild build — Option B is correct because using a webhook that triggers on all branch pushes is the simplest and most direct way to achieve automatic builds on every push. Option A is wrong because polling is less efficient and introduces latency. Option C is wrong because event rules require event bus setup and are more complex. Option D is wrong because scheduled builds do not respond to pushes.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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