- A
The S3 bucket is the same bucket used for the deploy action.
Why wrong: Using the same bucket for source and deploy is allowed and does not prevent triggers.
- B
The pipeline is configured to detect changes based on object key, but the uploaded file uses the same key as an existing object.
CodePipeline triggers only when the object key changes or a new version is created; overwriting with same key may not trigger if versioning is not combined with proper event filtering.
- C
The S3 bucket is not configured to send Amazon SQS notifications to CodePipeline.
Why wrong: CodePipeline uses Amazon CloudWatch Events or S3 event notifications, not SQS directly.
- D
The S3 bucket does not have versioning enabled.
Why wrong: Versioning is required for S3 source actions; if it were disabled, the pipeline would not work at all.
DOP-C02 SDLC Automation Practice Question
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 is using AWS CodePipeline with multiple stages that include source, build, and deploy. The pipeline uses an Amazon S3 bucket as the source action. The team notices that the pipeline is not automatically starting when new files are uploaded to the S3 bucket. The S3 bucket has versioning enabled. What is the most likely reason?
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
The pipeline is configured to detect changes based on object key, but the uploaded file uses the same key as an existing object.
Option B is correct because CodePipeline's S3 source action detects changes based on object key and ETag. When a file is uploaded with the same key as an existing object, even with versioning enabled, the ETag may not change if the content is identical, or the pipeline may not trigger if it only monitors for new keys. Versioning creates a new version ID, but CodePipeline's default detection relies on object key changes or ETag changes, not version ID changes, so uploading a file with the same key may not 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.
- ✗
The S3 bucket is the same bucket used for the deploy action.
Why it's wrong here
Using the same bucket for source and deploy is allowed and does not prevent triggers.
- ✓
The pipeline is configured to detect changes based on object key, but the uploaded file uses the same key as an existing object.
Why this is correct
CodePipeline triggers only when the object key changes or a new version is created; overwriting with same key may not trigger if versioning is not combined with proper event filtering.
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.
- ✗
The S3 bucket is not configured to send Amazon SQS notifications to CodePipeline.
Why it's wrong here
CodePipeline uses Amazon CloudWatch Events or S3 event notifications, not SQS directly.
- ✗
The S3 bucket does not have versioning enabled.
Why it's wrong here
Versioning is required for S3 source actions; if it were disabled, the pipeline would not work at all.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume versioning always triggers the pipeline, but CodePipeline's S3 source action relies on object key or ETag changes, not version ID changes, so uploading the same key with identical content may not start the pipeline.
Detailed technical explanation
How to think about this question
Under the hood, CodePipeline's S3 source action uses Amazon S3 event notifications (via Amazon EventBridge or CloudWatch Events) to detect object creation events. The pipeline triggers only when a new object key is created or an existing object's ETag changes. With versioning, uploading a file with the same key creates a new version, but the object key remains the same, and if the content is identical, the ETag may not change, causing the pipeline to miss the trigger. This is a subtle behavior where versioning alone does not guarantee pipeline execution.
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: The pipeline is configured to detect changes based on object key, but the uploaded file uses the same key as an existing object. — Option B is correct because CodePipeline's S3 source action detects changes based on object key and ETag. When a file is uploaded with the same key as an existing object, even with versioning enabled, the ETag may not change if the content is identical, or the pipeline may not trigger if it only monitors for new keys. Versioning creates a new version ID, but CodePipeline's default detection relies on object key changes or ETag changes, not version ID changes, so uploading a file with the same key may not start the pipeline.
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.
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
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