DVA-C02 Deployment Practice Test 2 — 15 Questions

Question 1

A developer is using AWS CodeDeploy to deploy an application to an Auto Scaling group. The deployment must be as fast as possible while ensuring that at least 50% of instances remain healthy throughout. Which deployment configuration should be used?

Accepted Answer

CodeDeployDefault.HalfAtATime. CodeDeployDefault.HalfAtATime is the correct choice because it deploys to half of the instances in the Auto Scaling group at a time, ensuring that at least 50% of instances remain healthy throughout the deployment. This configuration balances speed (by deploying to multiple instances concurrently) with the required availability constraint, making it the fastest option that satisfies the 'at least 50% healthy' requirement.

Answer

CodeDeployDefault.OneAtATime

Answer

CodeDeployDefault.AllAtOnce

Answer

CodeDeployDefault.MinHealthyPercent

Question 2

A developer uses AWS CodePipeline to deploy a serverless application defined with AWS SAM. The pipeline consists of Source (S3), Build (CodeBuild), and Deploy (CloudFormation) stages. The developer wants to run integration tests after the stack is deployed but before the pipeline completes. Which approach should the developer use?

Accepted Answer

Add a test stage after the Deploy stage with an action that invokes a Lambda function to run tests.. Option A is correct because AWS CodePipeline allows you to add a test stage after the Deploy stage, and you can configure an action that invokes an AWS Lambda function to run integration tests. This ensures tests run automatically after the CloudFormation stack is deployed but before the pipeline completes, meeting the requirement without manual intervention.

Answer

Use the CloudFormation stack's Outputs to trigger a Lambda function that runs tests.

Answer

Configure a post-deployment hook in the SAM template that runs tests.

Answer

Add a manual approval step after Deploy, then run tests manually.

Question 3

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?

Accepted Answer

Configure a CloudWatch alarm and enable alarm-based automatic rollback in the AutoRollbackConfiguration.. Option A is correct because CodeDeploy's AutoRollbackConfiguration allows you to specify CloudWatch alarms as triggers for automatic rollback. By creating a CloudWatch alarm that monitors the EC2 Auto Scaling group's health check failures and setting the alarm's evaluation period to 10 minutes, the deployment will automatically roll back if any new instance fails a health check within that window. This directly meets the requirement without custom scripting or manual intervention.

Answer

Set the DeploymentStyle to 'BLUE_GREEN' and configure the 'LoadBalancerInfo' with the target group.

Answer

Create a lifecycle hook for the Auto Scaling group to trigger a rollback script.

Answer

Set a TriggerConfiguration in the deployment group to send notifications on deployment failure.

Question 4

A developer is using AWS Elastic Beanstalk to deploy a web application. The application uses an in-environment Amazon RDS database instance. The developer needs to update the application code without risking data loss. The database must not be affected by environment operations such as termination or updates. What is the recommended approach?

Accepted Answer

Create a standalone Amazon RDS instance and reconfigure the application to use it instead of the in-environment database.. Option A is correct because decoupling the RDS database from the Elastic Beanstalk environment by creating a standalone RDS instance ensures that the database is not tied to the environment's lifecycle. In-environment databases are automatically deleted when the environment is terminated or updated, risking data loss. By reconfiguring the application to point to an external RDS instance, the database persists independently of environment operations, meeting the requirement to avoid data loss during code updates or environment changes.

Answer

Take a snapshot of the database before each deployment and restore it after the deployment completes.

Answer

Use the Elastic Beanstalk environment's 'Swap environment URLs' feature to perform a blue/green deployment.

Answer

Create a new Elastic Beanstalk environment with a new RDS instance and migrate data manually.

Question 5

A developer is using AWS CodePipeline with a two-stage pipeline: Source (CodeCommit) and Deploy (Elastic Beanstalk). The developer wants to add a test stage that runs unit tests using AWS CodeBuild. The test stage should run only when a specific branch (development) is pushed. Which approach should the developer use?

Accepted Answer

Add a test stage in the pipeline and configure a 'branch' filter on the source action to only trigger for the development branch.. Option B is correct because AWS CodePipeline allows you to configure a 'branch' filter directly on the source action (CodeCommit) to restrict which branch triggers the pipeline execution. By adding a test stage with a CodeBuild action and setting the source action's 'Branch' filter to 'development', the pipeline will only run the test stage when changes are pushed to that specific branch. This is the simplest and most native approach, requiring no additional compute or manual intervention.

Answer

Create a separate pipeline for the development branch and configure it with the test stage.

Answer

Add a test stage in the pipeline and configure a 'branch' condition on the test action using a Lambda function.

Answer

Add a test stage in the pipeline and use a 'Manual approval' action that requires a human to verify the branch.

Question 6

A company uses AWS Elastic Beanstalk to deploy a web application. The application requires a database connection string that is different for each environment (development, staging, production). The developer wants to set these values without hardcoding them in the application code. Which configuration method should the developer use?

Accepted Answer

Use environment properties in the Elastic Beanstalk console. Option B is correct because Elastic Beanstalk environment properties allow you to inject configuration values (like database connection strings) into your application at deployment time without hardcoding them. These properties are set per environment in the Elastic Beanstalk console or via CLI, and the application retrieves them as environment variables, making them environment-specific and secure.

Answer

Use the .ebextensions configuration files with environment-specific snippet files

Answer

Use Amazon RDS within Elastic Beanstalk

Answer

Use AWS Systems Manager Parameter Store with an IAM instance profile

Question 7

A company uses AWS CodePipeline with a manual approval step before deployment. The developer wants to ensure that if a pipeline execution is waiting for approval and new code is pushed, the awaiting execution is canceled and a new one starts with the latest code. Which pipeline execution mode should be configured?

Accepted Answer

Superseded. The Superseded execution mode is correct because it automatically cancels any currently running or waiting pipeline execution when a new one is triggered, ensuring that only the latest code proceeds through the pipeline. This is ideal for scenarios with manual approval steps where stale executions should not block or delay the deployment of the most recent commit.

Answer

Queued

Answer

Parallel

Answer

Single

Question 8

A developer is deploying a serverless application using AWS SAM. The application consists of multiple Lambda functions and an Amazon API Gateway. The developer wants to enable canary deployments for the API Gateway stage to gradually shift traffic. Which SAM resource attribute should the developer use?

Accepted Answer

DeploymentPreference. Option A is correct because the `DeploymentPreference` attribute in AWS SAM's `AWS::Serverless::Api` resource enables canary deployments for API Gateway stages. This attribute allows you to configure traffic shifting patterns, such as linear or canary, by specifying settings like `Type` (e.g., `Canary10Percent5Minutes`) and `Alarms` to automatically roll back on failures. It directly integrates with AWS CodeDeploy to manage the gradual traffic shift without manual intervention.

Answer

CanarySetting

Answer

StageName

Answer

MethodSettings

Question 9

A developer is using AWS CodeDeploy to deploy an application to an EC2 Auto Scaling group. The deployment must be rolled back automatically if any instance in the deployment fails a health check within 10 minutes after the deployment. Which configuration should the developer set in the CodeDeploy deployment group?

Accepted Answer

Configure a deployment group with automatic rollback enabled and set the rollback trigger to instance failure.. Option D is correct because the developer needs to configure the CodeDeploy deployment group with automatic rollback enabled and set the rollback trigger to 'instance failure'. This configuration ensures that if any instance fails a health check within the specified monitoring period (10 minutes after deployment), CodeDeploy automatically rolls back the deployment to the last known good revision. The 'instance failure' trigger specifically monitors the health of each instance and initiates a rollback when a health check fails, meeting the requirement exactly.

Answer

Set the deployment style to in-place and enable automatic rollback with event triggers.

Answer

Configure a deployment configuration with a minimum healthy hosts of 90% and enable CloudWatch alarm-based rollback.

Answer

Set the deployment style to blue/green and enable automatic rollback for deployment failure.

Question 10

A company uses AWS CodeDeploy to deploy a web application to an Auto Scaling group of EC2 instances. The deployment must automatically roll back if the new application version causes health check failures for more than 20% of the instances within the first 5 minutes after deployment. Which configuration should the developer set in the deployment group?

Accepted Answer

Create a CloudWatch alarm that monitors the DeploymentFailure metric and configure it as a rollback trigger in the deployment group.. Option A is correct because AWS CodeDeploy supports CloudWatch alarm-based rollback triggers. By creating a CloudWatch alarm that monitors the DeploymentFailure metric (or a custom metric reflecting health check failures) and configuring it as a rollback trigger in the deployment group, the deployment will automatically roll back if the alarm state is breached within the specified monitoring period (e.g., 5 minutes). This directly meets the requirement to roll back when more than 20% of instances fail health checks.

Answer

Define a lifecycle hook in the Auto Scaling group that terminates instances with failing health checks.

Answer

Set the deployment configuration to use a minimum healthy host percentage of 80% and a timeout of 5 minutes.

Answer

Configure the AppSpec file with a rollback section that specifies the health check failure threshold.

Question 11

A developer is using AWS CodeDeploy to deploy an application to a fleet of EC2 instances in an Auto Scaling group. The application must remain available during the deployment. The developer wants to update one instance at a time, ensuring that only one instance is taken offline at any moment. Which deployment configuration should the developer choose?

Accepted Answer

CodeDeployDefault.OneAtATime. CodeDeployDefault.OneAtATime is the correct deployment configuration because it deploys the application to only one instance at a time, ensuring that the remaining instances continue to serve traffic. This matches the requirement to take only one instance offline at any moment, preserving high availability throughout the deployment.

Answer

CodeDeployDefault.HalfAtATime

Answer

CodeDeployDefault.AllAtOnce

Answer

CodeDeployDefault.LambdaCanary10Percent5Minutes

Question 12

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?

Accepted Answer

Configure the deployment group to use an alarm-based rollback with a CloudWatch alarm on the ELB health check. Option B is correct because the requirement is to automatically roll back based on health check failures within a specific time window after deployment. AWS CodeDeploy supports alarm-based rollbacks where you can configure a CloudWatch alarm that monitors the ELB health check status of the new instances. When the alarm triggers within the configured monitoring period (e.g., 10 minutes), CodeDeploy automatically rolls back the deployment to the previous version, meeting the exact condition described.

Answer

Set the deployment configuration to 'CodeDeployDefault.EC2AllAtOnce'

Answer

Enable automatic rollback in the deployment group configuration and set the event to 'DEPLOYMENT_FAILURE' or 'DEPLOYMENT_STOP_ON_REQUEST'

Answer

Configure the deployment group with a 'LoadBalancerInfo' and enable 'originalInstanceTermination' for rollback

Question 13

A developer is using AWS CodeDeploy to deploy an application to an EC2 Auto Scaling group. The deployment must ensure that a minimum number of instances are always running and healthy. The developer wants to deploy to 10 instances. Which deployment configuration should the developer use?

Accepted Answer

CodeDeployDefault.OneAtATime. Option A, CodeDeployDefault.OneAtATime, is correct because it ensures that only one instance is updated at a time, which guarantees that a minimum number of instances (9 out of 10) remain healthy and running throughout the deployment. This configuration is ideal for maintaining high availability and meeting strict uptime requirements.

Answer

CodeDeployDefault.AllAtOnce

Answer

CodeDeployDefault.HalfAtATime

Answer

CodeDeployDefault.MinHealthyHostsPercentage: 90

Question 14

A developer is deploying a serverless application using AWS SAM. The application includes an AWS Lambda function that is triggered by an S3 bucket event when an object is created. The developer wants to ensure that the Lambda function has the correct permissions to be invoked by S3. Which resource should the developer define in the SAM template?

Accepted Answer

AWS::Lambda::Permission. AWS::Lambda::Permission is the correct resource because it explicitly grants the S3 service principal permission to invoke the Lambda function when an object is created. In AWS SAM, this resource is automatically generated when you define an S3 event source on a Lambda function, but if you need to declare it manually or override permissions, you use AWS::Lambda::Permission with a SourceArn pointing to the S3 bucket and a SourceAccount to prevent confused deputy attacks.

Answer

AWS::S3::BucketPolicy

Answer

AWS::Lambda::EventSourceMapping

Answer

AWS::IAM::Role

Question 15

A company uses AWS Elastic Beanstalk to run a web application. They want to deploy a new version with zero downtime. They have a production environment running the current version and a staging environment running the new version. After thoroughly testing the staging environment, they want to swap the URLs so that production now points to the new version. Which deployment strategy should they use?

Accepted Answer

Blue/green deployment with CNAME swap. Blue/green deployment with a CNAME swap is the correct strategy because it allows you to run two identical environments (blue = current production, green = new version) and switch traffic atomically by updating the DNS CNAME record. This achieves zero downtime since the production environment remains active until the swap is complete, and the staging environment has been fully tested. Elastic Beanstalk supports this by letting you perform a CNAME swap between environments via the console, CLI, or API.

Answer

Rolling deployment

Answer

Immutable deployment

Answer

All at once deployment