DVA-C02 Deployment Practice Test 10 — 15 Questions

Question 1

A developer is using AWS Elastic Beanstalk to deploy a web application. The application requires a highly available environment across multiple Availability Zones. The developer wants to update the application without any downtime while minimizing the number of new instances launched. Which deployment policy should the developer use?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Rolling with additional batch. (Rolling with additional batch) is correct because it launches a new batch of instances before taking the old ones out of service, ensuring full capacity is maintained during the deployment. This provides high availability across multiple Availability Zones while minimizing the number of new instances compared to an immutable deployment, which would double the instance count. The additional batch absorbs the traffic during the rolling update, preventing any downtime.

Answer

All at once

Answer

Rolling

Answer

Immutable

Question 2

A developer is deploying a microservices application on Amazon ECS with the Fargate launch type. The application uses an Application Load Balancer (ALB) to route traffic. The developer wants to perform a blue/green deployment with automated traffic shifting using AWS CodeDeploy. What is the minimum number of target groups required for this deployment?

Accepted Answer

Two. In a blue/green deployment with AWS CodeDeploy and an Application Load Balancer (ALB) on Amazon ECS (Fargate), two target groups are required: one for the 'blue' (current) environment and one for the 'green' (new) environment. CodeDeploy shifts traffic from the blue target group to the green target group by updating the ALB listener rules, allowing zero-downtime deployments and automated rollback if needed.

Answer

One

Answer

Three

Answer

Four

Question 3

A developer is using AWS SAM to define a serverless application. The application includes an AWS Lambda function and an Amazon API Gateway REST API. The developer wants to configure the API Gateway stage to enable logging and set the stage name based on the SAM parameter Stage. In the SAM template, which property of the AWS::Serverless::Api resource should the developer use to set the stage name?

Accepted Answer

StageName. The `StageName` property of the `AWS::Serverless::Api` resource directly sets the stage name for the API Gateway REST API. By using a SAM parameter like `Stage` (e.g., `StageName: !Ref Stage`), the developer can dynamically control the stage name at deployment time. This is the intended and simplest way to configure the stage name in an AWS SAM template.

Answer

DefinitionBody

Answer

StageDescription

Answer

EndpointConfiguration

Question 4

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 5

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.. 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 6

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.. 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 7

A developer is using AWS Elastic Beanstalk to deploy a web application. The application requires a highly available environment across multiple Availability Zones. The developer wants to update the application without any downtime while minimizing the number of new instances launched. Which deployment policy should the developer use?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Create a standalone Amazon RDS instance and reconfigure the application to use it instead of the in-environment database.. 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 8

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. 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. While database connection strings are sensitive, environment properties are the simplest configuration method within Elastic Beanstalk for such values. AWS Systems Manager Parameter Store (Option D) is more secure for secrets but is not a native Elastic Beanstalk feature and requires additional setup; the question specifically asks for a configuration method within Elastic Beanstalk's native capabilities.

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 9

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 10

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 11

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. 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 12

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. 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 13

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 14

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

Question 15

A developer is using AWS Elastic Beanstalk to deploy a web application. The application requires a highly available environment across multiple Availability Zones. The developer wants to update the application without any downtime while minimizing the number of new instances launched. Which deployment policy should the developer use?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Decouple the database from the Elastic Beanstalk environment by creating a separate RDS instance and connecting the application to it externally.. When an RDS instance is included in an Elastic Beanstalk environment, it is tied to the environment's lifecycle. If the environment is terminated or rebuilt, the database is also deleted. Decoupling the database by creating a standalone RDS instance and connecting the application to it externally ensures the database persists independently of application deployments, allowing code updates without risking data loss.

Answer

Update the application code directly on the EC2 instances without redeploying the environment.

Answer

Create a new environment configuration, update the code, and swap the CNAME of the environments.

Answer

Use Elastic Beanstalk's platform updates while keeping the database attached to the environment.