← DOP-C02·Amazon Web Services

Question 981 of 1,750

SDLC Automation →mediumMultiple ChoiceObjective-mapped

Why CodePipeline Does Not Trigger When New Objects Are Uploaded to S3

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 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.

A
The S3 bucket policy denies the CodePipeline service role.
Why wrong: Bucket policies affect access, not event notifications.
B
The S3 bucket is in a different AWS Region than the pipeline.
Why wrong: Cross-region pipelines are possible; region mismatch would cause a different error.
C
The S3 bucket does not have versioning enabled.
Why wrong: Versioning is not required for triggers; it's for object version management.
D
The S3 bucket does not have an event notification configured to invoke the pipeline.
CodePipeline requires S3 event notifications to automatically start.

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

✓

The S3 bucket does not have an event notification configured to invoke the pipeline.

Option D is correct because CodePipeline does not automatically monitor S3 buckets for new objects. To trigger a pipeline on S3 events, you must explicitly configure an S3 event notification (e.g., s3:ObjectCreated:Put) that sends the event to CloudWatch Events or directly to CodePipeline via Amazon EventBridge. Without this notification, the pipeline will not start when a new object is uploaded.

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 the CodePipeline service role.
Why it's wrong here
Bucket policies affect access, not event notifications.
✗
The S3 bucket is in a different AWS Region than the pipeline.
Why it's wrong here
Cross-region pipelines are possible; region mismatch would cause a different error.
✗
The S3 bucket does not have versioning enabled.
Why it's wrong here
Versioning is not required for triggers; it's for object version management.
✓
The S3 bucket does not have an event notification configured to invoke the pipeline.
Why this is correct
CodePipeline requires S3 event notifications to automatically start.
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 often assume CodePipeline automatically polls S3 for changes (like GitHub webhooks), but in reality, S3 requires an explicit event notification configuration to trigger the pipeline, and the exam tests this distinction between polling-based and event-driven triggers.

Detailed technical explanation

How to think about this question

Under the hood, CodePipeline relies on Amazon EventBridge (formerly CloudWatch Events) to receive S3 event notifications. When you configure an S3 event notification, S3 publishes the event to EventBridge, which then invokes the pipeline via a rule. Without this rule, the pipeline has no mechanism to detect new objects. A subtle behavior is that if you enable S3 EventBridge integration at the bucket level, you must also create an EventBridge rule with the pipeline as the target; simply enabling the integration does not automatically trigger the pipeline.

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.

Related DOP-C02 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Configuration Management and IaC practice questions

Practise DOP-C02 questions linked to Configuration Management and IaC.

Resilient Cloud Solutions practice questions

Practise DOP-C02 questions linked to Resilient Cloud Solutions.

Monitoring and Logging practice questions

Practise DOP-C02 questions linked to Monitoring and Logging.

Incident and Event Response practice questions

Practise DOP-C02 questions linked to Incident and Event Response.

Security and Compliance practice questions

Practise DOP-C02 questions linked to Security and Compliance.

SDLC Automation practice questions

Practise DOP-C02 questions linked to SDLC Automation.

DOP-C02 fundamentals practice questions

Practise DOP-C02 questions linked to DOP-C02 fundamentals.

DOP-C02 scenario practice questions

Practise DOP-C02 questions linked to DOP-C02 scenario.

DOP-C02 troubleshooting practice questions

Practise DOP-C02 questions linked to DOP-C02 troubleshooting.

Practice this exam

Start a free DOP-C02 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

DOP-C02 practice-test guide →Study guide →Browse all practice tests

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 S3 bucket does not have an event notification configured to invoke the pipeline. — Option D is correct because CodePipeline does not automatically monitor S3 buckets for new objects. To trigger a pipeline on S3 events, you must explicitly configure an S3 event notification (e.g., s3:ObjectCreated:Put) that sends the event to CloudWatch Events or directly to CodePipeline via Amazon EventBridge. Without this notification, the pipeline will not start when a new object is uploaded.

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.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

How Courseiva writes practice questions · Editorial policy

Keep practising

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

This DOP-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 DOP-C02 exam.