This DOP-C02 practice question tests your understanding of sdlc automation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 for source control and AWS CodeBuild for building a Java application. They want to enforce that every commit triggers a build, but only if the commit message contains a specific pattern 'BUILD:'. Which THREE steps are required?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a webhook in CodeBuild that filters events by commit message pattern.
Option B creates the trigger. Option C adds a condition for the commit message. Option E ensures the build runs in a VPC. Option A is not needed for filtering. Option D is for Lambda integration, not required.
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.
✗
Create an AWS Lambda function that processes the commit message and calls CodeBuild.
Why it's wrong here
Incorrect: Adds complexity; not required.
✗
Create a CloudWatch Events rule to invoke CodeBuild on every push to CodeCommit.
Why it's wrong here
Incorrect: Must filter by commit message.
✓
Configure a webhook in CodeBuild that filters events by commit message pattern.
Why this is correct
Correct: Webhooks can filter by pattern.
Related concept
Static NAT maps one inside address to one outside address.
✓
Create a custom trigger in CodeCommit that invokes CodeBuild.
Why this is correct
Correct: Triggers can invoke CodeBuild.
Related concept
Static NAT maps one inside address to one outside address.
✓
Use a buildspec.yml file with a conditional phase that checks the commit message.
Why this is correct
Correct: The buildspec can skip build if message doesn't match.
Related concept
Static NAT maps one inside address to one outside address.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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.
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: Configure a webhook in CodeBuild that filters events by commit message pattern. — Option B creates the trigger. Option C adds a condition for the commit message. Option E ensures the build runs in a VPC. Option A is not needed for filtering. Option D is for Lambda integration, not required.
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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Question Discussion
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