- A
Set the 'requireSignedCommits' parameter in the repository configuration to 'true'.
Why wrong: This parameter does not exist in CodeCommit.
- B
Configure branch protection rules in IAM to deny push access to main unless the commit is signed.
Why wrong: IAM cannot inspect commit signatures.
- C
Use an AWS CodeCommit trigger with an AWS Lambda function that validates commit signatures and rejects unsigned commits.
Lambda can validate signatures and reject pushes via CodeCommit's ability to reject triggers.
- D
Create a repository policy that denies git push actions unless the condition 'codecommit:References' and 'codecommit:SourceIp' match.
Why wrong: This does not check signatures.
Question 723 of 1,750
Enforce GPG Signed Commits in AWS CodeCommit
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 company uses AWS CodeCommit for source control and wants to enforce that all commits to the main branch are signed. The DevOps team has configured Git commit signing using GPG keys. However, some developers are able to push unsigned commits to main. What should the engineer do to enforce signed commits?
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
✓
Use an AWS CodeCommit trigger with an AWS Lambda function that validates commit signatures and rejects unsigned commits.
Option C is correct because AWS CodeCommit does not natively support a 'require signed commits' setting like GitHub or GitLab. To enforce signed commits, you must use a CodeCommit trigger that invokes an AWS Lambda function to validate the GPG signature of each commit pushed to the main branch. The Lambda function can parse the commit object, verify the signature using the developer's public key, and reject the push by returning an error if the commit is unsigned or the signature is invalid.
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.
- ✗
Set the 'requireSignedCommits' parameter in the repository configuration to 'true'.
Why it's wrong here
This parameter does not exist in CodeCommit.
- ✗
Configure branch protection rules in IAM to deny push access to main unless the commit is signed.
Why it's wrong here
IAM cannot inspect commit signatures.
- ✓
Use an AWS CodeCommit trigger with an AWS Lambda function that validates commit signatures and rejects unsigned commits.
Why this is correct
Lambda can validate signatures and reject pushes via CodeCommit's ability to reject triggers.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a repository policy that denies git push actions unless the condition 'codecommit:References' and 'codecommit:SourceIp' match.
Why it's wrong here
This does not check signatures.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume AWS CodeCommit has a built-in 'require signed commits' toggle like GitHub or GitLab, but AWS CodeCommit requires a custom serverless solution (Lambda trigger) to enforce this, and the exam tests your ability to recognize when native features are absent.
Detailed technical explanation
How to think about this question
Under the hood, CodeCommit triggers are configured to invoke a Lambda function synchronously on push events. The Lambda function receives a JSON payload containing commit details, including the commit ID and branch reference. The function can use the AWS SDK to call GetCommit and retrieve the commit object, which includes the 'committer' field with the GPG signature key ID if present. If the signature is missing or invalid, the Lambda function can throw an exception to reject the push, effectively enforcing signed commits at the repository level.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
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: Use an AWS CodeCommit trigger with an AWS Lambda function that validates commit signatures and rejects unsigned commits. — Option C is correct because AWS CodeCommit does not natively support a 'require signed commits' setting like GitHub or GitLab. To enforce signed commits, you must use a CodeCommit trigger that invokes an AWS Lambda function to validate the GPG signature of each commit pushed to the main branch. The Lambda function can parse the commit object, verify the signature using the developer's public key, and reject the push by returning an error if the commit is unsigned or the signature is invalid.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
2 more ways this is tested on DOP-C02
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company uses AWS CodeCommit as a Git repository. Developers want to enforce that all commits are signed with GPG keys. How can this be achieved?
medium- A.Configure a Git hook in the repository to reject unsigned commits.
- B.Use an IAM policy condition to deny pushes if the commit is not signed.
- C.Enable the 'Require GPG signatures' option in the CodeCommit repository settings.
- ✓ D.Ask developers to sign commits locally and use a pre-commit hook.
Why D: AWS CodeCommit does not natively support server-side GPG signature verification or a repository-level setting to require signed commits. The most practical way to enforce signed commits is through client-side Git hooks. Option D describes this approach: developers sign commits locally and a pre-commit hook ensures that every commit is signed before it is created. While not foolproof (developers can bypass the hook), it is the only viable method among the options that aligns with CodeCommit's capabilities. Option A misinterprets 'Git hook in the repository' as a server-side hook, which CodeCommit does not support. Option B is incorrect because IAM policies cannot evaluate commit signature status. Option C is incorrect because CodeCommit lacks such a native setting.
Variation 2. A team is using AWS CodeCommit as their version control system. They want to ensure that all commits are signed with a GPG key. What is the simplest way to enforce this?
easy- A.Use AWS CloudTrail to monitor unsigned commits and automatically revert them.
- B.Use a pre-commit hook in the local repository to enforce signing.
- C.Configure an IAM policy that denies PutFile if the commit is not signed.
- ✓ D.Enable the 'Require signed commits' option in the CodeCommit repository settings.
Why D: Option D is correct because AWS CodeCommit provides a built-in repository setting called 'Require signed commits' that, when enabled, rejects any push containing unsigned commits at the server side. This is the simplest and most reliable enforcement mechanism because it does not rely on client-side configurations or custom scripts, and it leverages CodeCommit's native integration with GPG signature verification.
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Last reviewed: Jul 4, 2026
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