- A
Configure the deployment group to automatically roll back when a CloudWatch alarm is triggered, and also enable automatic rollback on deployment failure. Set up a CloudWatch alarm on the deployment group's failure metric to notify the on-call engineer
Provides both automatic rollback on alarm and failure, and alerting on rollback failure.
- B
Create a CloudWatch Events rule that triggers an AWS Lambda function to roll back the deployment when the alarm state is reached, and configure the Lambda function to send an SNS notification on failure
Why wrong: More complex than using built-in CodeDeploy features.
- C
Add a manual approval step before the deploy stage in CodePipeline and require the on-call engineer to approve or reject the deployment
Why wrong: Manual approval defeats automation.
- D
Enable the 'rollback when a deployment fails' option in the deployment group and create a CloudWatch alarm on the deployment group's failure metric to notify the on-call engineer via Amazon SNS
Why wrong: This handles failure but not the alarm-based rollback.
Quick Answer
The correct answer is to configure the deployment group to automatically roll back when a CloudWatch alarm is triggered, and also enable automatic rollback on deployment failure, while setting up a CloudWatch alarm on the deployment group's failure metric to notify the on-call engineer. This solution directly addresses the automatic rollback deployment failure CloudWatch alarm scenario because CodeDeploy can trigger a rollback when a CloudWatch alarm enters the ALARM state, catching HTTP 500 errors before the deployment is considered complete. Additionally, enabling rollback on deployment failure ensures that if the rollback itself fails, the deployment group status reflects a failure, which can be monitored by a separate CloudWatch alarm to alert the on-call engineer. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this tests your understanding of CodeDeploy’s automatic rollback triggers versus manual approval steps or simple notifications—a common trap is choosing SNS alone, which alerts but does not perform the rollback. Memory tip: think “Alarm triggers rollback, failure triggers alarm” to remember the two-layer automation.
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 has a CI/CD pipeline using AWS CodePipeline that deploys a critical web application to an Auto Scaling group of EC2 instances. The pipeline includes a deploy stage using AWS CodeDeploy. Recently, the deployment failed because the new application version caused an increase in HTTP 500 errors. The operations team manually rolled back the deployment by redeploying the previous version. However, the team wants to automate this process so that future failed deployments are automatically rolled back. Additionally, they want to ensure that if the rollback itself fails, the system should alert the on-call engineer. Currently, the deployment group is configured with 'rollback when a deployment fails' disabled. The team has also set up a CloudWatch alarm that triggers when the HTTP 500 error rate exceeds a threshold. What should a DevOps engineer do to meet these requirements with minimal operational overhead?
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 CloudWatch alarm is triggered, and also enable automatic rollback on deployment failure. Set up a CloudWatch alarm on the deployment group's failure metric to notify the on-call engineer
Option C is correct because enabling automatic rollback on alarm in CodeDeploy will trigger a rollback when the CloudWatch alarm is in ALARM state. Additionally, enabling automatic rollback on deployment failure ensures that if the rollback itself fails, the deployment group status will indicate failure, and a CloudWatch alarm can be set on the deployment group's failure metric to alert the on-call engineer. Option A is wrong because it does not address rollback on alarm. Option B is wrong because a manual approval step would require human intervention. Option D is wrong because SNS notification alone does not perform the rollback.
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.
- ✓
Configure the deployment group to automatically roll back when a CloudWatch alarm is triggered, and also enable automatic rollback on deployment failure. Set up a CloudWatch alarm on the deployment group's failure metric to notify the on-call engineer
Why this is correct
Provides both automatic rollback on alarm and failure, and alerting on rollback failure.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a CloudWatch Events rule that triggers an AWS Lambda function to roll back the deployment when the alarm state is reached, and configure the Lambda function to send an SNS notification on failure
Why it's wrong here
More complex than using built-in CodeDeploy features.
- ✗
Add a manual approval step before the deploy stage in CodePipeline and require the on-call engineer to approve or reject the deployment
Why it's wrong here
Manual approval defeats automation.
- ✗
Enable the 'rollback when a deployment fails' option in the deployment group and create a CloudWatch alarm on the deployment group's failure metric to notify the on-call engineer via Amazon SNS
Why it's wrong here
This handles failure but not the alarm-based rollback.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
What to study next
Got this wrong? Here's your next step.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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 CloudWatch alarm is triggered, and also enable automatic rollback on deployment failure. Set up a CloudWatch alarm on the deployment group's failure metric to notify the on-call engineer — Option C is correct because enabling automatic rollback on alarm in CodeDeploy will trigger a rollback when the CloudWatch alarm is in ALARM state. Additionally, enabling automatic rollback on deployment failure ensures that if the rollback itself fails, the deployment group status will indicate failure, and a CloudWatch alarm can be set on the deployment group's failure metric to alert the on-call engineer. Option A is wrong because it does not address rollback on alarm. Option B is wrong because a manual approval step would require human intervention. Option D is wrong because SNS notification alone does not perform the rollback.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 20, 2026
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.
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