← DOP-C02·Amazon Web Services

Question 1,116 of 1,750

SDLC Automation →easyMultiple ChoiceObjective-mapped

Troubleshooting CodePipeline Webhook: Missing Event Rule

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 DevOps engineer is configuring a webhook trigger in AWS CodePipeline to automatically start a pipeline when changes are pushed to a specific branch in a CodeCommit repository. The webhook is created and the trigger is set to the 'main' branch. However, when a developer pushes a commit to the 'main' branch, the pipeline does not start. 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.

A
The webhook is not properly registered with CodeCommit due to a conflict with an existing webhook.
Why wrong: CodeCommit supports multiple webhooks; conflicts are not a common issue.
B
The CodeCommit repository is set to send events to Amazon S3, which conflicts with the webhook.
Why wrong: S3 notifications are used for S3 sources, not CodeCommit triggers.
C
The pipeline requires an Amazon SNS notification to be configured for the trigger to work.
Why wrong: SNS is not required for webhook triggers.
D
The CloudWatch Events rule that triggers the pipeline on repository changes is not configured.
CodePipeline webhooks rely on CloudWatch Events to detect changes; without the rule, the pipeline won't 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 CloudWatch Events rule that triggers the pipeline on repository changes is not configured.

Option D is correct because AWS CodePipeline uses Amazon CloudWatch Events (now Amazon EventBridge) to detect repository changes and trigger pipeline executions. When a webhook is created in CodePipeline, it automatically sets up a CloudWatch Events rule that listens for CodeCommit repository state changes (e.g., push to a branch). If this rule is missing, misconfigured, or deleted, the pipeline will not start despite the webhook being present. The webhook itself only registers the endpoint; the actual event routing depends on the CloudWatch Events rule.

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 webhook is not properly registered with CodeCommit due to a conflict with an existing webhook.
Why it's wrong here
CodeCommit supports multiple webhooks; conflicts are not a common issue.
✗
The CodeCommit repository is set to send events to Amazon S3, which conflicts with the webhook.
Why it's wrong here
S3 notifications are used for S3 sources, not CodeCommit triggers.
✗
The pipeline requires an Amazon SNS notification to be configured for the trigger to work.
Why it's wrong here
SNS is not required for webhook triggers.
✓
The CloudWatch Events rule that triggers the pipeline on repository changes is not configured.
Why this is correct
CodePipeline webhooks rely on CloudWatch Events to detect changes; without the rule, the pipeline won't 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 assume the webhook itself directly triggers the pipeline, but AWS CodePipeline relies on CloudWatch Events as the intermediary event bus, so a missing or misconfigured CloudWatch Events rule will break the trigger even if the webhook is correctly set up.

Detailed technical explanation

How to think about this question

Under the hood, when you create a webhook in CodePipeline, it registers a target in CloudWatch Events for the `aws.codecommit` source with a detail-type of `CodeCommit Repository State Change`. The rule filters on branch names (e.g., `main`) and triggers the pipeline. If the rule's IAM role lacks permissions to invoke the pipeline, or if the rule is disabled, the trigger fails silently. In real-world scenarios, this often happens when the CloudWatch Events rule is accidentally deleted during infrastructure cleanup or when using Infrastructure as Code without proper drift detection.

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.

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: The CloudWatch Events rule that triggers the pipeline on repository changes is not configured. — Option D is correct because AWS CodePipeline uses Amazon CloudWatch Events (now Amazon EventBridge) to detect repository changes and trigger pipeline executions. When a webhook is created in CodePipeline, it automatically sets up a CloudWatch Events rule that listens for CodeCommit repository state changes (e.g., push to a branch). If this rule is missing, misconfigured, or deleted, the pipeline will not start despite the webhook being present. The webhook itself only registers the endpoint; the actual event routing depends on the CloudWatch Events rule.

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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