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Question 256 of 1,750

SDLC Automation →hardMultiple ChoiceObjective-mapped

DOP-C02 SDLC Automation Practice Question

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 is using AWS CodeDeploy to deploy a web application to an Auto Scaling group of Amazon EC2 instances. The deployment strategy is Blue/Green. After a successful deployment, the team notices that the new instances are receiving traffic but the application returns errors. The old instances are still serving traffic correctly. The team wants to roll back immediately. What should be done?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.

A
Stop the current deployment using the AWS CLI.
Why wrong: Stopping the deployment does not reroute traffic; the green environment remains active.
B
Manually update the Auto Scaling group to associate new instances with the old launch configuration.
Why wrong: This would not reroute traffic; you would need to modify the load balancer target groups, which is more complex than using CodeDeploy rollback.
C
Configure the deployment group to automatically roll back when a deployment fails, then manually trigger a rollback.
CodeDeploy supports automatic rollback; triggering a rollback will reroute traffic back to the blue environment.
D
Redeploy the same application revision to the same Auto Scaling group.
Why wrong: Redeploying the same revision would not fix the errors; it would repeat the same faulty deployment.

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

✓

Configure the deployment group to automatically roll back when a deployment fails, then manually trigger a rollback.

Option C is correct because CodeDeploy Blue/Green deployments create a new Auto Scaling group for the new instances. When the new instances fail, you can configure the deployment group to automatically roll back on failure, and then manually trigger a rollback via the AWS CLI or console. This action terminates the new Auto Scaling group and re-routes traffic back to the original (old) Auto Scaling group, restoring the working application.

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.

✗
Stop the current deployment using the AWS CLI.
Why it's wrong here
Stopping the deployment does not reroute traffic; the green environment remains active.
✗
Manually update the Auto Scaling group to associate new instances with the old launch configuration.
Why it's wrong here
This would not reroute traffic; you would need to modify the load balancer target groups, which is more complex than using CodeDeploy rollback.
✓
Configure the deployment group to automatically roll back when a deployment fails, then manually trigger a rollback.
Why this is correct
CodeDeploy supports automatic rollback; triggering a rollback will reroute traffic back to the blue environment.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Redeploy the same application revision to the same Auto Scaling group.
Why it's wrong here
Redeploying the same revision would not fix the errors; it would repeat the same faulty deployment.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates assume stopping a deployment or manually adjusting Auto Scaling groups will revert traffic, but CodeDeploy Blue/Green deployments require a specific rollback action that terminates the new environment and restores the original one.

Detailed technical explanation

How to think about this question

In a CodeDeploy Blue/Green deployment, the original Auto Scaling group is preserved and traffic is shifted to a newly created Auto Scaling group. The rollback mechanism works by terminating the new Auto Scaling group and re-routing traffic to the original group, effectively undoing the deployment. This is distinct from an in-place deployment where rollback might involve re-deploying a previous revision to the same instances.

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.

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: Configure the deployment group to automatically roll back when a deployment fails, then manually trigger a rollback. — Option C is correct because CodeDeploy Blue/Green deployments create a new Auto Scaling group for the new instances. When the new instances fail, you can configure the deployment group to automatically roll back on failure, and then manually trigger a rollback via the AWS CLI or console. This action terminates the new Auto Scaling group and re-routes traffic back to the original (old) Auto Scaling group, restoring the working application.

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: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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