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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 DevOps team is using AWS CodePipeline to automate build, test, and deploy phases. The team notices that the pipeline is failing intermittently during the deploy stage due to a timeout when updating an Auto Scaling group. The deploy stage uses CodeDeploy with a blue/green deployment configuration. What is the MOST likely cause and solution?

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 CloudFormation stack update is failing. Update the stack with a longer timeout.
Why wrong: CloudFormation is not mentioned in the deploy stage.
B
The CodeCommit repository has too many branches. Clean up unused branches.
Why wrong: Number of branches does not cause deploy timeouts.
C
The CodeDeploy deployment group has a low original revision timeout. Increase the original revision timeout.
Blue/green deployment waits for new instances to be healthy; increasing timeout allows more time.
D
The CodeBuild project has a low build timeout. Increase the build timeout.
Why wrong: Build timeout is irrelevant to deploy stage failures.

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 CodeDeploy deployment group has a low original revision timeout. Increase the original revision timeout.

The intermittent timeout during the deploy stage when updating an Auto Scaling group with a blue/green deployment is most likely caused by the CodeDeploy deployment group's original revision timeout being too low. This timeout controls how long CodeDeploy waits for the new instances in the green environment to become healthy and complete their lifecycle hooks before considering the original revision as failed. Increasing this timeout allows sufficient time for instance initialization, application deployment, and health checks, resolving the intermittent failures.

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 CloudFormation stack update is failing. Update the stack with a longer timeout.
Why it's wrong here
CloudFormation is not mentioned in the deploy stage.
✗
The CodeCommit repository has too many branches. Clean up unused branches.
Why it's wrong here
Number of branches does not cause deploy timeouts.
✓
The CodeDeploy deployment group has a low original revision timeout. Increase the original revision timeout.
Why this is correct
Blue/green deployment waits for new instances to be healthy; increasing timeout allows more time.
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 CodeBuild project has a low build timeout. Increase the build timeout.
Why it's wrong here
Build timeout is irrelevant to deploy stage failures.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse the deploy stage timeout with build timeouts or unrelated service timeouts (like CloudFormation or CodeBuild), failing to recognize that CodeDeploy has its own specific timeout for the blue/green transition that directly impacts Auto Scaling group updates.

Detailed technical explanation

How to think about this question

In CodeDeploy blue/green deployments, the original revision timeout (also known as the 'original revision termination timeout') is the period CodeDeploy waits for the green fleet to pass health checks before terminating the blue fleet. If this timeout is too short, new instances may not complete their bootstrapping or application deployment within the window, causing the deployment to fail. This is distinct from the 'install timeout' which applies to individual deployment steps; the original revision timeout specifically governs the overall transition from blue to green, making it critical for Auto Scaling group integrations where instance initialization can be variable.

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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

Visual reference

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 CodeDeploy deployment group has a low original revision timeout. Increase the original revision timeout. — The intermittent timeout during the deploy stage when updating an Auto Scaling group with a blue/green deployment is most likely caused by the CodeDeploy deployment group's original revision timeout being too low. This timeout controls how long CodeDeploy waits for the new instances in the green environment to become healthy and complete their lifecycle hooks before considering the original revision as failed. Increasing this timeout allows sufficient time for instance initialization, application deployment, and health checks, resolving the intermittent failures.

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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