- A
Use an AWS Lambda function that polls CodeCommit for new pull requests and invokes CodeBuild when changes in 'src' directory are detected.
Why wrong: Polling is inefficient and not recommended; webhooks are preferred.
- B
Create an AWS CodeBuild project with a source provider of CodeCommit and configure 'WEBHOOK' events with a filter for pull requests and path filter for 'src/**'.
CodeBuild webhooks can trigger on pull request events with path filters.
- C
Set up an Amazon EventBridge rule that matches CodeCommit pull request events and invoke CodeBuild. Add a condition in the CodeBuild buildspec to check if changes are in 'src' directory.
Why wrong: While EventBridge can trigger on pull requests, path filtering should be done at the trigger level, not in the buildspec, for efficiency.
- D
Configure an AWS CodePipeline with a Source stage for CodeCommit and a Test stage for CodeBuild. Use a manual approval step to trigger on pull requests.
Why wrong: CodePipeline does not support pull request triggers natively; it tracks branches.
Quick Answer
The answer is to create an AWS CodeBuild project with a source provider of CodeCommit and configure WEBHOOK events with a filter for pull requests and a path filter for 'src/**'. This is correct because CodeBuild natively supports webhook-based triggers that can listen for specific Git events like pull request creation, and its path filter allows you to restrict execution to changes within a defined directory pattern, such as 'src/**', ensuring unit tests run only when relevant code is modified. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of how to run tests on pull request with path filter efficiently without overcomplicating the architecture—a common trap is reaching for CodePipeline or Lambda, but CodeBuild’s built-in webhook filtering is the simplest and most direct solution. Remember the mnemonic: "CodeBuild catches the PR path" to recall that CodeBuild handles both the pull request trigger and the path filter in one configuration.
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 run unit tests when a pull request is created, but only for changes to the 'src' directory. Which approach should they use?
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
Create an AWS CodeBuild project with a source provider of CodeCommit and configure 'WEBHOOK' events with a filter for pull requests and path filter for 'src/**'.
Option B is correct because AWS CodeBuild can be triggered by a pull request event with a path filter. Option A is wrong because CodePipeline does not natively trigger on pull requests. Option C is wrong because Lambda alone cannot trigger on CodeCommit events without an additional trigger. Option D is wrong because EventBridge can trigger on pull request events, but the path filtering should be done in the CodeBuild project configuration for efficiency.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use an AWS Lambda function that polls CodeCommit for new pull requests and invokes CodeBuild when changes in 'src' directory are detected.
Why it's wrong here
Polling is inefficient and not recommended; webhooks are preferred.
- ✓
Create an AWS CodeBuild project with a source provider of CodeCommit and configure 'WEBHOOK' events with a filter for pull requests and path filter for 'src/**'.
Why this is correct
CodeBuild webhooks can trigger on pull request events with path filters.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Set up an Amazon EventBridge rule that matches CodeCommit pull request events and invoke CodeBuild. Add a condition in the CodeBuild buildspec to check if changes are in 'src' directory.
Why it's wrong here
While EventBridge can trigger on pull requests, path filtering should be done at the trigger level, not in the buildspec, for efficiency.
- ✗
Configure an AWS CodePipeline with a Source stage for CodeCommit and a Test stage for CodeBuild. Use a manual approval step to trigger on pull requests.
Why it's wrong here
CodePipeline does not support pull request triggers natively; it tracks branches.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
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
How to think about this question
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.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. 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.
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 DOP-C02 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Create an AWS CodeBuild project with a source provider of CodeCommit and configure 'WEBHOOK' events with a filter for pull requests and path filter for 'src/**'. — Option B is correct because AWS CodeBuild can be triggered by a pull request event with a path filter. Option A is wrong because CodePipeline does not natively trigger on pull requests. Option C is wrong because Lambda alone cannot trigger on CodeCommit events without an additional trigger. Option D is wrong because EventBridge can trigger on pull request events, but the path filtering should be done in the CodeBuild project configuration for efficiency.
What should I do if I get this DOP-C02 question wrong?
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 DOP-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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