- A
The IAM role for CodePipeline does not have s3:GetObject permission.
Why wrong: Permissions affect execution, not triggering.
- B
The pipeline is configured to use polling instead of event-based triggers.
Why wrong: Polling is not the default; it's not the most likely cause.
- C
Amazon S3 versioning is not enabled on the bucket.
CodePipeline uses S3 event notifications which require versioning.
- D
AWS CloudTrail is not enabled.
Why wrong: CloudTrail is not required for pipeline triggers.
Question 130 of 1,616
Why S3 Versioning Is Needed for CodePipeline Automatic Triggers
This DVA-C02 practice question tests your understanding of development with aws services. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is using AWS CodePipeline to automate its CI/CD pipeline. The pipeline has a source stage that uses Amazon S3. The developer updates a file in the S3 bucket, but the pipeline does not start automatically. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
✓
Amazon S3 versioning is not enabled on the bucket.
Option C is correct because CodePipeline requires S3 versioning to be enabled on the source bucket to automatically detect changes and start the pipeline. Without versioning, CodePipeline cannot uniquely identify new object versions, so it relies on manual or scheduled polling instead of event-based triggers. Enabling versioning ensures that each PUT operation generates a new version ID, which CodePipeline uses to invoke the pipeline automatically.
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.
- ✗
The IAM role for CodePipeline does not have s3:GetObject permission.
Why it's wrong here
Permissions affect execution, not triggering.
- ✗
The pipeline is configured to use polling instead of event-based triggers.
Why it's wrong here
Polling is not the default; it's not the most likely cause.
- ✓
Amazon S3 versioning is not enabled on the bucket.
Why this is correct
CodePipeline uses S3 event notifications which require versioning.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS CloudTrail is not enabled.
Why it's wrong here
CloudTrail is not required for pipeline triggers.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the IAM role permissions (Option A) are the root cause, but the actual requirement is S3 versioning, which is a bucket-level configuration that enables event-driven pipeline starts.
Detailed technical explanation
How to think about this question
Under the hood, CodePipeline uses Amazon S3 event notifications (s3:ObjectCreated:Put) to trigger pipeline executions, but these notifications only fire when versioning is enabled because S3 needs a unique version ID to correlate the event. In a real-world scenario, if you disable versioning on a bucket used by CodePipeline, you must manually start the pipeline or configure a scheduled poll, which introduces latency and defeats the purpose of continuous delivery.
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: Amazon S3 versioning is not enabled on the bucket. — Option C is correct because CodePipeline requires S3 versioning to be enabled on the source bucket to automatically detect changes and start the pipeline. Without versioning, CodePipeline cannot uniquely identify new object versions, so it relies on manual or scheduled polling instead of event-based triggers. Enabling versioning ensures that each PUT operation generates a new version ID, which CodePipeline uses to invoke the pipeline automatically.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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