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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 company uses AWS CodePipeline to deploy a web application to an Elastic Beanstalk environment. The pipeline has a source stage from CodeCommit, a build stage using CodeBuild, and a deploy stage to Elastic Beanstalk. Recently, deployments started failing with an error: 'The deployment failed because the Elastic Beanstalk environment is in an UPDATE_ROLLBACK_IN_PROGRESS state.' 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 buildspec.yml file contains an invalid command that prevents artifact generation
Why wrong: Build spec errors would cause the build stage to fail, not the deploy stage.
B
A previous deployment failed and triggered an automatic rollback, leaving the environment in an unstable state
Elastic Beanstalk environments can enter UPDATE_ROLLBACK_IN_PROGRESS if a previous deployment failed, blocking new deployments until the rollback completes.
C
A CloudWatch alarm is blocking the deployment due to high error rates
Why wrong: CloudWatch alarms do not block deployments; they only notify or trigger auto scaling actions.
D
Insufficient IAM permissions for CodePipeline to pull source code from CodeCommit
Why wrong: Permissions issues would affect the source stage, not the deploy stage.

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

✓

A previous deployment failed and triggered an automatic rollback, leaving the environment in an unstable state

The error indicates the Elastic Beanstalk environment is stuck in an UPDATE_ROLLBACK_IN_PROGRESS state, which occurs when a previous deployment failed and Elastic Beanstalk automatically rolled back the changes. This leaves the environment in an unstable state that prevents new deployments until the rollback completes or is manually resolved. CodePipeline cannot proceed because Elastic Beanstalk rejects any new update operations while in this state.

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 buildspec.yml file contains an invalid command that prevents artifact generation
Why it's wrong here
Build spec errors would cause the build stage to fail, not the deploy stage.
✓
A previous deployment failed and triggered an automatic rollback, leaving the environment in an unstable state
Why this is correct
Elastic Beanstalk environments can enter UPDATE_ROLLBACK_IN_PROGRESS if a previous deployment failed, blocking new deployments until the rollback completes.
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.
✗
A CloudWatch alarm is blocking the deployment due to high error rates
Why it's wrong here
CloudWatch alarms do not block deployments; they only notify or trigger auto scaling actions.
✗
Insufficient IAM permissions for CodePipeline to pull source code from CodeCommit
Why it's wrong here
Permissions issues would affect the source stage, not the deploy stage.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may confuse a deployment failure with a permissions or build configuration issue, but the specific error message about the environment state directly points to a prior failed deployment and rollback as the root cause.

Detailed technical explanation

How to think about this question

When an Elastic Beanstalk environment update fails, the service automatically initiates a rollback to the last known good configuration, setting the environment to UPDATE_ROLLBACK_IN_PROGRESS. During this state, Elastic Beanstalk locks the environment to prevent concurrent modifications, and any new deployment attempts (including from CodePipeline) will fail with the observed error. The environment must reach a stable state (e.g., Ready) before new updates can be applied, which may require manual intervention via the AWS Management Console or CLI to abort or complete the rollback.

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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

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: A previous deployment failed and triggered an automatic rollback, leaving the environment in an unstable state — The error indicates the Elastic Beanstalk environment is stuck in an UPDATE_ROLLBACK_IN_PROGRESS state, which occurs when a previous deployment failed and Elastic Beanstalk automatically rolled back the changes. This leaves the environment in an unstable state that prevents new deployments until the rollback completes or is manually resolved. CodePipeline cannot proceed because Elastic Beanstalk rejects any new update operations while in this state.

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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