Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A developer is using AWS CodeDeploy with a blue/green deployment strategy for an EC2 Auto Scaling group. The deployment must 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?
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 'CodeDeployDefault.EC2AllAtOnce'
This configuration deploys to all instances at once but does not enable automatic rollback based on health checks.
B
Best answer
Configure the deployment group to use an alarm-based rollback with a CloudWatch alarm on the ELB health check
Alarm-based rollback allows you to define a CloudWatch alarm that triggers a rollback if the new instances are unhealthy. This meets the requirement.
C
Distractor review
Enable automatic rollback in the deployment group configuration and set the event to 'DEPLOYMENT_FAILURE' or 'DEPLOYMENT_STOP_ON_REQUEST'
These events trigger rollback on deployment failure or manual stop, not on health check failures of instances.
D
Distractor review
Configure the deployment group with a 'LoadBalancerInfo' and enable 'originalInstanceTermination' for rollback
Original instance termination is for cleaning up after a successful deployment, not for automatic rollback based on health checks.
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: Configure the deployment group to use an alarm-based rollback with a CloudWatch alarm on the ELB health check — In CodeDeploy, automatic rollback for blue/green deployments can be triggered by a CloudWatch alarm. The developer should create an alarm that monitors the health of the new instances (e.g., ELB health check) and configure the deployment group to roll back when the alarm enters the ALARM state. Option B describes this approach. Option A does not enable rollback. Option C refers to deployment failure or stop-on-request events, not health check failures. Option D is about terminating original instances, 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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