Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A developer is using AWS CodeDeploy to deploy an application to an EC2 Auto Scaling group. The developer wants the deployment to automatically roll back if any of the new instances fail a health check within the first 10 minutes after deployment. Which configuration should the developer set in the CodeDeploy deployment group?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Configure a CloudWatch alarm and enable alarm-based automatic rollback in the AutoRollbackConfiguration.
The AutoRollbackConfiguration in the deployment group allows you to specify events that trigger an automatic rollback, including alarm (CloudWatch alarm). The developer can set an alarm that monitors health check metrics and configure the deployment group to roll back if that alarm is in the ALARM state.
B
Distractor review
Set the DeploymentStyle to 'BLUE_GREEN' and configure the 'LoadBalancerInfo' with the target group.
This configures a blue/green deployment, but does not set up automatic rollback. Rollback still requires additional configuration.
C
Distractor review
Create a lifecycle hook for the Auto Scaling group to trigger a rollback script.
Lifecycle hooks allow you to perform custom actions before instances launch or terminate, but they do not inherently trigger a CodeDeploy rollback.
D
Distractor review
Set a TriggerConfiguration in the deployment group to send notifications on deployment failure.
TriggerConfiguration is used for SNS notifications, not for automatic rollback. Rollback must be configured separately.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
Related DVA-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer is building a REST API using Amazon API Gateway that will serve static content from an Amazon S3 bucket. The API should cache responses for frequently accessed objects to reduce latency. Which API Gateway feature should the developer enable?
Question 2
A developer is running a web application on multiple Amazon EC2 instances behind an Application Load Balancer (ALB). The application needs to store user session state that must be available across all instances. The session data is small and temporary but must survive individual instance failures. Which AWS service should the developer use to store this session state?
Question 3
A developer has an AWS Lambda function that processes messages from an Amazon SQS standard queue. The function is idempotent and currently has a batch size of 10. The developer wants to increase throughput and increases the batch size to 100. After the change, CloudWatch metrics show a significant increase in throttles and the queue backlog is growing. The function's reserved concurrency is set to 10. What is the most effective action to resolve the throttling and improve throughput?
Question 4
A developer is managing an application running on Amazon EC2 instances behind an Application Load Balancer. Users report that the application becomes unresponsive after several hours, and restarting the instance temporarily fixes the issue. The developer suspects a memory leak but cannot add custom instrumentation. Which AWS service can collect memory utilization metrics and help identify the memory leak with minimal configuration?
Question 5
A developer is building a serverless web application using AWS Lambda and Amazon DynamoDB. The application needs to perform complex aggregations on data stored in DynamoDB. Which AWS service should the developer use to perform these aggregations efficiently without reading all the data into Lambda?
Question 6
A developer has an Amazon S3 bucket containing private user documents. The application must generate a time-limited URL for users to download their own documents without requiring the users to have AWS credentials. Which solution should the developer use?
FAQ
Questions learners often ask
What does this DVA-C02 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Configure a CloudWatch alarm and enable alarm-based automatic rollback in the AutoRollbackConfiguration. — To automatically roll back based on health check failures after deployment, the developer must configure alarm-based rollback in the deployment group settings. This involves creating a CloudWatch alarm that triggers when the new instances fail health checks, and then specifying that alarm in the rollback configuration. CodeDeploy can also roll back on deployment failure, but that is a different trigger. The 'AutoRollbackConfiguration' in the deployment group defines whether to roll back on deployment failure, alarm, or both. The developer should enable rollback on alarm and provide the CloudWatch alarm ARN. The other options are incorrect: 'DeploymentStyle' defines blue/green or in-place, 'LoadBalancerInfo' specifies the load balancer for health checks (but not the rollback trigger), and 'TriggerConfiguration' is for SNS notifications, not rollback.
What should I do if I get this DVA-C02 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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