DVA-C02 Deployment Practice Test 4 — 15 Questions

Question 1

A developer is using AWS CodeDeploy to deploy an application to an EC2 Auto Scaling group. The developer wants to monitor the deployment and automatically roll back if a specified Amazon CloudWatch alarm is triggered during the deployment. Which CodeDeploy feature should the developer configure?

Accepted Answer

Deployment group alarm configuration. The Deployment group alarm configuration in AWS CodeDeploy allows you to specify Amazon CloudWatch alarms that, when triggered during a deployment, automatically initiate a rollback. This feature is configured at the deployment group level and ensures that if a predefined alarm (e.g., high error rate or latency) enters the ALARM state, CodeDeploy stops the deployment and reverts to the last known good revision. This provides automated, policy-driven rollback without manual intervention.

Answer

Deployment configuration with alarm

Answer

Revision rollback

Answer

EC2 instance health check

Question 2

A developer is deploying a containerized application to Amazon ECS with the Fargate launch type using AWS CodeDeploy for blue/green deployments. The application is behind an Application Load Balancer (ALB). What is the minimum number of ALB target groups required for a blue/green deployment?

Accepted Answer

2. In a blue/green deployment with Amazon ECS (Fargate) and AWS CodeDeploy, the deployment process requires two distinct target groups: 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 during the deployment, allowing for instant rollback by switching back. A single target group cannot differentiate between the two environments, and three or more are unnecessary because the blue/green model only needs two active target groups at any time.

Answer

1

Answer

3

Answer

4

Question 3

A developer is using AWS Elastic Beanstalk to deploy a web application. The application requires a relational database. The developer wants to ensure that the database is not accidentally deleted when the Elastic Beanstalk environment is terminated. Which approach should the developer take?

Accepted Answer

Create the RDS instance outside of Elastic Beanstalk and configure the application to connect to it using environment variables.. Option B is correct because creating the RDS instance outside of Elastic Beanstalk decouples the database lifecycle from the environment lifecycle. When the Elastic Beanstalk environment is terminated, the external RDS instance remains intact and is not deleted. The application can connect to it using environment variables configured in the Elastic Beanstalk environment, ensuring persistence of data.

Answer

Create the database as part of the Elastic Beanstalk environment by adding an RDS database configuration in the .ebextensions.

Answer

Use an Amazon DynamoDB table instead of a relational database.

Answer

Configure a retention policy on the RDS instance within the Elastic Beanstalk environment.

Question 4

A developer is using AWS CloudFormation to deploy a stack with multiple resources. To ensure that a specific EC2 instance is created only after a security group is created, the developer wants to define the dependency. How should the developer achieve this in the CloudFormation template?

Accepted Answer

Use the DependsOn attribute on the EC2 instance resource. Option A is correct because the `DependsOn` attribute explicitly tells AWS CloudFormation to create the EC2 instance only after the security group has been successfully created. Without this explicit dependency, CloudFormation may attempt to create resources in parallel, which could cause the EC2 instance launch to fail if it references a security group that does not yet exist.

Answer

Use the Ref function to refer to the security group in the EC2 instance properties

Answer

Use the AWS::NoValue intrinsic function

Answer

Use the Condition attribute on the EC2 instance

Question 5

A developer is deploying an application using AWS Elastic Beanstalk. The application requires a custom Amazon Machine Image (AMI) that includes specific software packages not available in the standard Elastic Beanstalk platform. Which approach should the developer use to ensure the custom AMI is used for all EC2 instances in the environment?

Accepted Answer

Create a custom platform using the Packer tool and specify it in the environment configuration.. Option A is correct because AWS Elastic Beanstalk allows you to create a custom platform using Packer, which can include a custom AMI with specific software packages. You then specify this custom platform in the environment configuration, ensuring all EC2 instances in the environment use that AMI. This approach is the only supported method for using a custom AMI that is not part of the standard Elastic Beanstalk platform.

Answer

Use the Elastic Beanstalk console to change the AMI ID in the environment configuration after creation.

Answer

Modify the .ebextensions configuration file to specify the custom AMI ID.

Answer

Launch a new environment with a different platform version that includes the required software.

Question 6

A developer is deploying an application using AWS Elastic Beanstalk with a Docker platform. The developer wants to minimize downtime during deployments and ensure that the new version is fully tested before routing traffic to it. Which deployment policy should the developer choose?

Accepted Answer

Traffic splitting.. Traffic splitting (option D) is correct because it allows the developer to gradually shift a percentage of traffic from the old application version to the new version, enabling canary testing. This minimizes downtime by ensuring the new version is fully validated before receiving full traffic, and it aligns with the requirement to test the new version before routing all traffic to it.

Answer

All at once.

Answer

Rolling with additional batch.

Answer

Immutable.

Question 7

A developer is deploying a web application using AWS Elastic Beanstalk. The application runs on multiple Amazon EC2 instances behind an Application Load Balancer. The developer wants to deploy a new version with zero downtime and the ability to quickly roll back if issues are discovered. Which deployment policy should the developer choose?

Accepted Answer

Immutable. Immutable deployment is the correct choice because it launches a completely new set of EC2 instances in a new Auto Scaling group with the updated application version, then swaps the load balancer target group to point to the new instances. This ensures zero downtime during deployment and provides an instant rollback by simply reverting the target group to the old instances if issues are detected.

Answer

All at once

Answer

Rolling

Answer

Rolling with additional batch

Question 8

A developer wants to deploy a new version of an application to an EC2 Auto Scaling group using AWS CodeDeploy. The developer wants to minimize downtime and ensure that if the deployment fails, it automatically rolls back to the previous version. Which deployment type should the developer choose?

Accepted Answer

Blue/green. Blue/green deployment is the correct choice because it creates a separate, new Auto Scaling group (green) alongside the existing one (blue), allowing traffic to be shifted to the new environment after validation. This minimizes downtime by keeping the old environment fully operational during the deployment, and CodeDeploy can automatically roll back by redirecting traffic to the blue environment if the deployment fails.

Answer

In-place

Answer

Canary

Answer

Linear

Question 9

A developer is deploying a web application on AWS Elastic Beanstalk. The environment must maintain the same number of running instances throughout the deployment to ensure capacity. The developer also wants to minimize downtime. Which deployment policy should be used?

Accepted Answer

Rolling with additional batch. Rolling with additional batch is correct because it first launches a new batch of instances in addition to the existing ones, ensuring full capacity is maintained throughout the deployment. Once the new instances are healthy, instances are updated in batches, and the original batch is terminated only after the new ones are fully serving traffic, minimizing downtime.

Answer

All at once

Answer

Rolling

Answer

Immutable

Question 10

A developer is deploying a serverless application using AWS SAM. The application includes an API Gateway REST API and a Lambda function. The developer wants to set up a custom domain name for the API in the production stage. Which resource should the developer define in the SAM template to achieve this with minimal effort?

Accepted Answer

AWS::Serverless::Api. The AWS::Serverless::Api resource in an AWS SAM template provides a high-level abstraction that simplifies the configuration of API Gateway REST APIs, including the ability to set up a custom domain name via the Domain property. This approach requires minimal effort because SAM automatically creates the underlying AWS::ApiGateway::DomainName and AWS::ApiGateway::BasePathMapping resources, handles the TLS certificate association, and manages the stage deployment. Defining a raw AWS::ApiGateway::DomainName would require additional manual configuration for base path mapping and stage integration, making the Serverless::Api the most efficient choice.

Answer

AWS::ApiGateway::DomainName

Answer

AWS::ApiGateway::BasePathMapping

Answer

AWS::Route53::RecordSet

Question 11

A developer is using AWS CodeBuild to build a Java application. The buildspec.yml file currently runs unit tests. The developer wants to generate a code coverage report and publish it to the CodeBuild console for analysis. Which CodeBuild feature should be used?

Accepted Answer

Test reports. AWS CodeBuild's test reports feature allows developers to create reports from test result files, including code coverage reports, and publish them to the CodeBuild console for analysis. This feature supports various report formats such as JaCoCo, Cobertura, and SimpleCov, enabling the developer to visualize coverage metrics directly in the console without external tools.

Answer

Build artifacts

Answer

Amazon CloudWatch Logs

Answer

Amazon S3 access logs

Question 12

A developer is using AWS CodeDeploy to deploy an application to an Amazon ECS service using the Fargate launch type. The developer wants to ensure that the deployment rolls back automatically if the new task set fails health checks. Which configuration should the developer set?

Accepted Answer

Enable rollback in the deployment group settings.. Option B is correct because enabling rollback in the deployment group settings allows CodeDeploy to automatically revert the deployment to the previous working task set if the new task set fails health checks. This is a native feature of CodeDeploy that monitors the health of the ECS service and triggers a rollback without manual intervention.

Answer

Set the deployment type to in-place.

Answer

Set the deployment configuration to CodeDeployDefault.OneAtATime.

Answer

Configure CloudWatch alarms to trigger a rollback.

Question 13

A developer is using AWS CodeDeploy to perform a canary deployment for an AWS Lambda function. The deployment should first shift 10% of traffic to the new version, and then shift the remaining 90% after 5 minutes. Which deployment configuration should be used?

Accepted Answer

Canary10Percent5Minutes. Option B is correct because the Canary10Percent5Minutes deployment configuration is specifically designed for canary deployments with AWS Lambda, shifting 10% of traffic to the new version immediately and then automatically shifting the remaining 90% after a 5-minute interval. This matches the requirement exactly, as CodeDeploy uses this predefined configuration to orchestrate the traffic shift in two steps with a built-in wait period.

Answer

AllAtOnce

Answer

Linear10PercentEvery10Minutes

Answer

BlueGreen

Question 14

A developer is using AWS CodeDeploy to deploy a new version of an AWS Lambda function. The developer wants to gradually shift traffic from the old version to the new version in 10-minute increments. Which deployment configuration should the developer use?

Accepted Answer

Linear10PercentEvery10Minutes. The Linear10PercentEvery10Minutes configuration shifts traffic from the old Lambda version to the new version in 10% increments every 10 minutes, which matches the developer's requirement of gradually shifting traffic in 10-minute increments. This is a linear deployment type in AWS CodeDeploy that provides a steady, incremental traffic shift over time.

Answer

Canary10Percent10Minutes

Answer

Canary10Percent30Minutes

Answer

AllAtOnce

Question 15

A developer is using AWS CodeDeploy to deploy an application to an EC2 Auto Scaling group. The deployment must follow a rolling update, deploying to exactly 50% of the instances at a time. Which built-in deployment configuration should the developer use?

Accepted Answer

CodeDeployDefault.HalfAtATime. Option B, CodeDeployDefault.HalfAtATime, is correct because it instructs CodeDeploy to deploy to exactly 50% of the instances in the Auto Scaling group at a time during a rolling update. This built-in configuration ensures that half the instances are updated before the other half, matching the requirement for a 50% rolling deployment.

Answer

CodeDeployDefault.OneAtATime

Answer

CodeDeployDefault.AllAtOnce

Answer

CodeDeployDefault.LambdaAllAtOnce