- A
Use Amazon CloudWatch Events to create a custom rule that matches the source code path and triggers the pipeline.
Why wrong: This adds unnecessary complexity and cost; S3 event filtering is simpler and more direct.
- B
Enable versioning on the S3 bucket and configure the pipeline to use the latest version.
Why wrong: Versioning does not filter events by prefix; the pipeline would still trigger on any upload.
- C
Configure the S3 event notification to use a prefix filter that matches the source code directory.
S3 event notifications support prefix and suffix filtering, allowing precise triggers.
- D
Disable the S3 trigger and manually start the pipeline after each code commit.
Why wrong: Manual intervention defeats the purpose of automation and is inefficient.
Using S3 Event Prefix Filters to Limit Pipeline Triggers
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 DevOps team uses AWS CodePipeline with an S3 source action and CodeBuild as a build provider. The pipeline has a manual approval step before deployment. Recently, the team noticed that the pipeline automatically starts when a new object is uploaded to the S3 bucket, even if the object is not the source code. They want to ensure that the pipeline only triggers on changes to the source code directory. What is the MOST efficient solution?
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
Configure the S3 event notification to use a prefix filter that matches the source code directory.
Option C is correct because S3 event notifications support prefix and suffix filters, allowing you to specify that only objects uploaded to a particular directory (e.g., 'source-code/') trigger the event. By configuring the S3 event notification with a prefix filter matching the source code directory, the pipeline will only start when a new object is uploaded to that specific path, ignoring uploads to other directories. This is the most efficient solution as it avoids unnecessary pipeline executions without adding extra components or manual intervention.
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.
- ✗
Use Amazon CloudWatch Events to create a custom rule that matches the source code path and triggers the pipeline.
Why it's wrong here
This adds unnecessary complexity and cost; S3 event filtering is simpler and more direct.
- ✗
Enable versioning on the S3 bucket and configure the pipeline to use the latest version.
Why it's wrong here
Versioning does not filter events by prefix; the pipeline would still trigger on any upload.
- ✓
Configure the S3 event notification to use a prefix filter that matches the source code directory.
Why this is correct
S3 event notifications support prefix and suffix filtering, allowing precise triggers.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Disable the S3 trigger and manually start the pipeline after each code commit.
Why it's wrong here
Manual intervention defeats the purpose of automation and is inefficient.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may overcomplicate the solution by choosing CloudWatch Events (Option A) or versioning (Option B), not realizing that S3 event notifications already have built-in prefix filtering that directly solves the problem without extra services or configuration.
Detailed technical explanation
How to think about this question
S3 event notifications use Amazon SNS, SQS, or Lambda to deliver events, and they support prefix and suffix filters at the bucket level. When you configure a prefix filter like 'src/', S3 only sends the notification for objects whose key starts with that prefix, which directly maps to the source code directory structure. This approach is lightweight and does not require additional AWS services or custom logic, making it the most efficient for filtering pipeline triggers by path.
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 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: Configure the S3 event notification to use a prefix filter that matches the source code directory. — Option C is correct because S3 event notifications support prefix and suffix filters, allowing you to specify that only objects uploaded to a particular directory (e.g., 'source-code/') trigger the event. By configuring the S3 event notification with a prefix filter matching the source code directory, the pipeline will only start when a new object is uploaded to that specific path, ignoring uploads to other directories. This is the most efficient solution as it avoids unnecessary pipeline executions without adding extra components or manual intervention.
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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Last reviewed: Jul 4, 2026
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