Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A developer is deploying a microservice using AWS CodeDeploy with an Amazon ECS compute platform. The service must be updated with a blue/green deployment strategy. The developer wants to ensure that if the deployment fails, the new task set is automatically terminated and the original task set continues to serve traffic. Which configuration should the developer set?
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
Distractor review
Set the deployment configuration to 'AllAtOnce' and enable termination of the original task set
The 'AllAtOnce' deployment configuration is not valid for ECS blue/green deployments. ECS blue/green uses 'Canary' or 'Linear' or custom configurations based on traffic shifting. 'AllAtOnce' is for Lambda or EC2/On-Premises compute platforms. Also, termination of the original task set is done after success, not on failure.
B
Distractor review
Define a blue/green deployment using an AppSpec file with a 'Hooks' section to specify a 'BeforeAllowTraffic' hook that checks health. If the check fails, CodeDeploy automatically rolls back.
Hooks can be used to run validation scripts, but automatic rollback on failure is configured separately in the deployment group under 'Rollback configuration'. The hooks themselves do not trigger a rollback; they can cause the deployment to fail, but the rollback behavior must be explicitly enabled.
C
Best answer
Set the deployment group's 'Rollback configuration' to automatically roll back failed deployments and configure the 'Deployment configuration' to terminate the original task set on success, but keep it on failure.
By enabling automatic rollback in the deployment group, CodeDeploy will automatically roll back to the original task set if the deployment fails. The 'terminate original task set on success' setting ensures that after a successful deployment, the old task set is terminated. The rollback configuration handles the failure case by terminating the new task set and keeping the original.
D
Distractor review
Use a manual approval step in the pipeline to decide whether to terminate the new task set.
A manual approval step does not provide automatic rollback on failure. It requires human intervention and does not automatically terminate the new task set on failure.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Set the deployment group's 'Rollback configuration' to automatically roll back failed deployments and configure the 'Deployment configuration' to terminate the original task set on success, but keep it on failure. — For ECS blue/green deployments with CodeDeploy, the developer can configure a deployment failure behavior in the deployment group's rollback configuration. By enabling automatic rollback, CodeDeploy will automatically terminate the new task set and keep the original task set serving traffic if the deployment fails.
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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