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SDLC Automation →mediumMultiple ChoiceObjective-mapped

DOP-C02 SDLC Automation Practice Question

This DOP-C02 practice question tests your understanding of sdlc automation. 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 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.

A
The IAM role for CodePipeline does not have s3:GetObject permission.
Why wrong: The role has necessary permissions as stated.
B
The S3 bucket policy denies access to CodePipeline.
Why wrong: The bucket policy is not the issue; the pipeline has permissions.
C
The S3 bucket does not have event notifications configured.
Why wrong: CodePipeline uses CloudWatch Events, not S3 event notifications, to detect changes.
D
AWS CloudTrail is not configured to deliver S3 data events to CloudWatch Logs.
CodePipeline relies on CloudWatch Events, which require CloudTrail to log S3 data events.

Full breakdown with real-world context →

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

✓

AWS CloudTrail is not configured to deliver S3 data events to CloudWatch Logs.

Option D is correct because CodePipeline's S3 source action does not rely on S3 event notifications to trigger pipeline executions. Instead, it uses Amazon CloudWatch Events (now Amazon EventBridge) to detect changes to the S3 bucket. For this to work, AWS CloudTrail must be configured to deliver S3 data events (specifically `PutObject` API calls) to CloudWatch Logs, which then generates the event that triggers the pipeline. Without CloudTrail data event logging, CodePipeline cannot detect object uploads, even if the IAM role has proper permissions.

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

The trap here is that candidates assume S3 event notifications are required for CodePipeline triggers, but AWS actually uses CloudTrail and EventBridge, so the correct answer focuses on CloudTrail configuration rather than S3 notifications.

Detailed technical explanation

How to think about this question

Under the hood, CodePipeline's S3 source action creates an Amazon EventBridge rule that matches `Object Created` events from CloudTrail for the specified S3 bucket. CloudTrail must be enabled with data events for `s3:PutObject` and `s3:CompleteMultipartUpload` to capture all upload scenarios. A common subtlety is that if CloudTrail is configured but the trail does not include data events for the specific bucket, or if the trail is disabled, the pipeline will not trigger. In real-world scenarios, teams often forget to enable CloudTrail data events after creating the pipeline, leading to silent failures.

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.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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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: AWS CloudTrail is not configured to deliver S3 data events to CloudWatch Logs. — Option D is correct because CodePipeline's S3 source action does not rely on S3 event notifications to trigger pipeline executions. Instead, it uses Amazon CloudWatch Events (now Amazon EventBridge) to detect changes to the S3 bucket. For this to work, AWS CloudTrail must be configured to deliver S3 data events (specifically `PutObject` API calls) to CloudWatch Logs, which then generates the event that triggers the pipeline. Without CloudTrail data event logging, CodePipeline cannot detect object uploads, even if the IAM role has proper permissions.

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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