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. Developers frequently push large binary files (e.g., compiled JARs) to the repository, causing the repository size to grow rapidly and slowing down clone operations. The team wants to enforce a policy to reject pushes that contain files larger than 50 MB. Which approach 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 trigger that invokes an AWS Lambda function to validate file sizes and reject the push.
Option A is correct because AWS CodeCommit supports custom triggers that invoke AWS Lambda functions on repository events, including pushes. By configuring a trigger for the 'push' event, a Lambda function can inspect each file in the push payload, check its size against the 50 MB threshold, and programmatically reject the push by returning an error response. This approach enforces the policy at the repository level without requiring client-side changes.
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 a CodeCommit trigger that invokes an AWS Lambda function to validate file sizes and reject the push.
Why this is correct
CodeCommit triggers allow custom validation before accepting a push.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set up an Amazon CloudWatch Events rule to monitor repository size and alert when it exceeds a threshold.
Why it's wrong here
This is reactive, not preventive.
✗
Create an IAM policy that denies the `codecommit:GitPush` action if the file size exceeds 50 MB.
Why it's wrong here
IAM policies cannot evaluate file sizes.
✗
Use a pre-receive hook in the repository to reject large files by generating an S3 pre-signed URL.
Why it's wrong here
Pre-receive hooks are not natively supported in CodeCommit.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse CodeCommit triggers with Git hooks (like pre-receive hooks) or assume IAM policies can enforce content-based rules, when in fact IAM cannot inspect file contents and CodeCommit does not support server-side Git hooks.
Detailed technical explanation
How to think about this question
Under the hood, CodeCommit triggers use Amazon SNS or Lambda to react to events asynchronously, but for synchronous rejection, the Lambda function must be invoked synchronously via the trigger and return an error to abort the push. The Lambda function receives a JSON payload containing the commit details and can iterate over the diff to check blob sizes using the Git object IDs. In practice, this pattern is also used to enforce naming conventions or scan for secrets, but note that the Lambda must complete within 15 seconds (the Git push timeout) to avoid the push succeeding by default.
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.
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.
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 trigger that invokes an AWS Lambda function to validate file sizes and reject the push. — Option A is correct because AWS CodeCommit supports custom triggers that invoke AWS Lambda functions on repository events, including pushes. By configuring a trigger for the 'push' event, a Lambda function can inspect each file in the push payload, check its size against the 50 MB threshold, and programmatically reject the push by returning an error response. This approach enforces the policy at the repository level without requiring client-side changes.
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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