The answer is that the S3 bucket does not have an event notification configured for the pipeline. This is the most likely cause because CodePipeline does not automatically monitor an S3 bucket for changes; instead, you must explicitly create an S3 event notification that publishes to Amazon EventBridge or directly to CodePipeline via a CloudWatch Events rule. Without this notification, the pipeline remains unaware of new object uploads and will not trigger. On the AWS Certified Developer Associate DVA-C02 exam, this concept tests your understanding of how source stages interact with external services—a common trap is assuming that simply pointing a pipeline to an S3 bucket is enough, when in fact the event notification is the critical link. Remember, S3 events are the trigger mechanism, not the pipeline itself. A useful memory tip: "No notification, no activation"—the pipeline needs a direct signal from S3 to start.
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. 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 company uses AWS CodePipeline with a source stage from Amazon S3. The pipeline triggers on changes to the S3 bucket. However, the pipeline does not trigger when a new object is uploaded. 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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The S3 bucket does not have an event notification configured for the pipeline.
Option A is correct because S3 event notifications must be configured to invoke the pipeline. Option B is wrong because the bucket policy is not related. Option C is wrong because the pipeline is not triggered by S3 events directly. Option D is wrong because encryption does not affect triggering.
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 policy denies access to CodePipeline.
Why it's wrong here
Bucket policy does not affect event notifications.
✓
The S3 bucket does not have an event notification configured for the pipeline.
Why this is correct
Event notifications are needed to trigger the pipeline.
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 pipeline is not configured with a webhook.
Why it's wrong here
Webhooks are for GitHub, not S3.
✗
The object is encrypted and CodePipeline cannot read it.
Why it's wrong here
Encryption does not prevent triggering.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The S3 bucket does not have an event notification configured for the pipeline. — Option A is correct because S3 event notifications must be configured to invoke the pipeline. Option B is wrong because the bucket policy is not related. Option C is wrong because the pipeline is not triggered by S3 events directly. Option D is wrong because encryption does not affect triggering.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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Question Discussion
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