- A
Create a webhook in CodePipeline and configure S3 to send HTTP requests to the webhook URL.
Why wrong: Incorrect: Webhooks are for GitHub or other web-based sources.
- B
Enable S3 event notifications on the bucket to publish events to Amazon CloudWatch Events.
Correct: S3 event notifications can trigger CloudWatch Events, which can trigger the pipeline.
- C
Configure AWS CloudTrail to log S3 PutObject events and trigger the pipeline.
Why wrong: Incorrect: CloudTrail is for API auditing, not triggering pipelines.
- D
Create an AWS Lambda function that is invoked on S3 object creation and starts the pipeline.
Why wrong: Incorrect: Lambda is unnecessary; S3 events can directly trigger CodePipeline via CloudWatch Events.
- E
In the CodePipeline source action, specify the S3 bucket and enable 'S3 source change detection'.
Correct: This option allows CodePipeline to use S3 event notifications automatically.
How to Trigger CodePipeline Automatically on S3 Object Upload
This DVA-C02 practice question tests your understanding of development with aws services. 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 developer is implementing a CI/CD pipeline using AWS CodePipeline. The pipeline has a source stage that uses an Amazon S3 bucket, a build stage that uses AWS CodeBuild, and a deploy stage that uses AWS CodeDeploy. The developer wants to ensure that the pipeline automatically triggers when a new file is uploaded to the S3 source bucket. Which TWO steps should the developer take to configure this? (Choose two.)
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
Enable S3 event notifications on the bucket to publish events to Amazon CloudWatch Events.
Option B is correct because S3 event notifications can be sent to Amazon CloudWatch Events (now Amazon EventBridge), which can then trigger a CodePipeline execution. This is a supported integration pattern for detecting changes in an S3 source bucket. Option E is also correct because CodePipeline's built-in 'S3 source change detection' feature uses Amazon CloudWatch Events to automatically detect new or updated objects in the specified S3 bucket and start the pipeline.
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.
- ✗
Create a webhook in CodePipeline and configure S3 to send HTTP requests to the webhook URL.
Why it's wrong here
Incorrect: Webhooks are for GitHub or other web-based sources.
- ✓
Enable S3 event notifications on the bucket to publish events to Amazon CloudWatch Events.
Why this is correct
Correct: S3 event notifications can trigger CloudWatch Events, which can trigger the pipeline.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure AWS CloudTrail to log S3 PutObject events and trigger the pipeline.
Why it's wrong here
Incorrect: CloudTrail is for API auditing, not triggering pipelines.
- ✗
Create an AWS Lambda function that is invoked on S3 object creation and starts the pipeline.
Why it's wrong here
Incorrect: Lambda is unnecessary; S3 events can directly trigger CodePipeline via CloudWatch Events.
- ✓
In the CodePipeline source action, specify the S3 bucket and enable 'S3 source change detection'.
Why this is correct
Correct: This option allows CodePipeline to use S3 event notifications automatically.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse S3 event notifications with CloudWatch Events, not realizing that CodePipeline's built-in detection already uses CloudWatch Events under the hood, making additional Lambda or webhook configurations unnecessary.
Detailed technical explanation
How to think about this question
Under the hood, CodePipeline's S3 change detection works by automatically creating an Amazon CloudWatch Events rule that listens for s3:ObjectCreated:* events on the specified bucket. This rule then targets the CodePipeline execution API, ensuring near-real-time pipeline starts. A subtle behavior is that if you manually disable the CloudWatch Events rule, the automatic detection stops, and you must re-enable it or use an alternative trigger like Lambda.
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
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable S3 event notifications on the bucket to publish events to Amazon CloudWatch Events. — Option B is correct because S3 event notifications can be sent to Amazon CloudWatch Events (now Amazon EventBridge), which can then trigger a CodePipeline execution. This is a supported integration pattern for detecting changes in an S3 source bucket. Option E is also correct because CodePipeline's built-in 'S3 source change detection' feature uses Amazon CloudWatch Events to automatically detect new or updated objects in the specified S3 bucket and start the pipeline.
What should I do if I get this DVA-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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Last reviewed: Jul 4, 2026
This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.
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