The correct answer is that AWS CloudTrail is not configured to deliver S3 data events to CloudWatch Logs. CodePipeline relies on Amazon CloudWatch Events to detect changes in an S3 source bucket, and CloudTrail must be enabled to capture S3 data events and forward them to CloudWatch Logs for this trigger mechanism to work. Without this delivery, the pipeline sees no activity and fails to start automatically. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding that CodePipeline does not use native S3 event notifications for triggers—a common trap where candidates assume S3 events alone suffice. Instead, the integration flows through CloudTrail and CloudWatch Events, making the data event delivery configuration critical. A useful memory tip: think of CloudTrail as the “eyes” that see the S3 change, CloudWatch Logs as the “ears” that hear it, and CloudWatch Events as the “mouth” that tells CodePipeline to act—if any link is missing, the pipeline stays silent.
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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 development team uses AWS CodePipeline with multiple stages including source, build, and deploy. The pipeline uses an Amazon S3 source action that triggers on changes to a specific bucket. Recently, the pipeline stopped triggering automatically. The IAM role for CodePipeline has the necessary permissions. 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
✓
AWS CloudTrail is not configured to deliver S3 data events to CloudWatch Logs.
Option C is correct because CodePipeline uses Amazon CloudWatch Events to detect S3 events. If CloudTrail is not configured to deliver events to CloudWatch Logs, the pipeline won't trigger. Option A is wrong because S3 event notifications are not used for CodePipeline triggers. Option B is wrong because the pipeline role has permissions. Option D is wrong because the S3 bucket policy is not relevant for 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 IAM role for CodePipeline does not have s3:GetObject permission.
Why it's wrong here
The role has necessary permissions as stated.
✗
The S3 bucket policy denies access to CodePipeline.
Why it's wrong here
The bucket policy is not the issue; the pipeline has permissions.
✗
The S3 bucket does not have event notifications configured.
Why it's wrong here
CodePipeline uses CloudWatch Events, not S3 event notifications, to detect changes.
✓
AWS CloudTrail is not configured to deliver S3 data events to CloudWatch Logs.
Why this is correct
CodePipeline relies on CloudWatch Events, which require CloudTrail to log S3 data events.
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.
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 DOP-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.
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: AWS CloudTrail is not configured to deliver S3 data events to CloudWatch Logs. — Option C is correct because CodePipeline uses Amazon CloudWatch Events to detect S3 events. If CloudTrail is not configured to deliver events to CloudWatch Logs, the pipeline won't trigger. Option A is wrong because S3 event notifications are not used for CodePipeline triggers. Option B is wrong because the pipeline role has permissions. Option D is wrong because the S3 bucket policy is not relevant for triggering.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-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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