DVA-C02 Deployment Practice Test 15 — 15 Questions

Question 1

A developer is deploying a new version of an application to Amazon ECS using AWS CodeDeploy. The application uses a blue/green deployment strategy. After the deployment, traffic is automatically shifted to the new task set. However, the developer wants to test the new version with a small percentage of users before shifting all traffic. What should the developer do?

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

Accepted Answer

Use CodeDeploy to perform a canary deployment that shifts 10% of traffic initially.. CodeDeploy supports canary deployments for ECS, which allow you to shift a specified percentage of traffic to the new task set initially (e.g., 10%) and then, after a configured interval, shift the remaining traffic. This matches the requirement to test with a small percentage of users before shifting all traffic. Option B directly implements this canary strategy.

Answer

Create a new ECS task definition with a different CPU/memory allocation.

Answer

Configure the target group to route traffic to a specific task set.

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Use ECS service auto scaling to gradually increase the number of tasks.

Question 2

A company uses AWS Elastic Beanstalk to deploy a web application. The environment is currently running a previous version. The developer uploads a new application version and deploys it to the environment. After the deployment, the environment health status turns 'Severe' and the new version is not accessible. The developer needs to quickly revert to the previous working version. What should the developer do?

Accepted Answer

Use the Elastic Beanstalk console to deploy the previous application version.. Elastic Beanstalk allows you to deploy a previous application version directly from the console or CLI without creating a new environment. This action replaces the current application version in the existing environment, restoring the previously working code and resolving the health status. It is the fastest and most straightforward way to revert while preserving the environment's configuration and resources.

Answer

Create a new environment with the previous version and swap CNAMEs.

Answer

Roll back the environment configuration to a previous saved configuration.

Answer

Terminate the environment and launch a new one with the previous version.

Question 3

A developer is deploying a serverless application using the AWS Serverless Application Model (SAM). The application consists of an API Gateway, a Lambda function, and a DynamoDB table. The developer wants to enable canary deployments for the Lambda function. What should the developer do?

Accepted Answer

Add the AutoPublishAlias and DeploymentPreference properties to the Lambda function in the SAM template.. The AWS SAM template supports canary deployments for Lambda functions by adding the `AutoPublishAlias` property (which automatically creates and publishes a new version to a Lambda alias) and the `DeploymentPreference` property (which defines the traffic-shifting strategy, such as `Canary10Percent5Minutes`). This enables CodeDeploy to gradually shift traffic from the current version to the new version without manual intervention.

Answer

Configure a CodeDeploy deployment group in the SAM template.

Answer

Create a Lambda alias and configure traffic shifting manually.

Answer

Use AWS CodePipeline to orchestrate the canary deployment.

Question 4

A company uses AWS CodeBuild to run tests and build artifacts for a Java application. The build process is taking longer than expected. The developer wants to speed up the build by caching dependencies. What should the developer do?

Accepted Answer

Enable local caching in the CodeBuild project configuration.. CodeBuild's local caching feature allows the build environment to cache dependencies (e.g., Maven local repository) in a local directory that persists across build runs for the same project. This eliminates the need to re-download dependencies on every build, significantly reducing build time. The cache is stored on the build instance's local storage and is automatically managed by CodeBuild.

Answer

Use a CodeCommit repository to store dependencies.

Answer

Store dependencies in an S3 bucket and download them in each build.

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Mount an Amazon EFS file system to the build environment and store dependencies there.

Question 5

A developer is deploying a microservices application on Amazon ECS using Fargate. The application uses an Application Load Balancer (ALB) to distribute traffic. The developer needs to perform a blue/green deployment with automatic rollback if health checks fail. What should the developer use?

Accepted Answer

Use AWS CodeDeploy with a blue/green deployment configuration.. AWS CodeDeploy natively supports blue/green deployments for Amazon ECS, allowing you to specify a blue/green configuration that automatically shifts traffic from the old (blue) task set to the new (green) task set. It integrates with the ALB to perform health checks and can automatically roll back the deployment if the health checks fail, meeting the requirement without manual intervention.

Answer

Configure ECS service auto scaling to replace tasks gradually.

Answer

Manually update the ECS service using the AWS Management Console.

Answer

Use AWS CloudFormation to update the ECS service with a new task definition.

Question 6

A developer is using AWS Elastic Beanstalk to deploy a web application. The environment uses an Application Load Balancer (ALB). The developer wants to perform a blue/green deployment to minimize downtime. Which TWO steps should the developer take? (Choose two.)

Accepted Answer

Deploy the new version to a separate Elastic Beanstalk environment.. Blue/green deployment requires a separate, isolated environment running the new version. Elastic Beanstalk supports this by allowing you to create a second environment (green) alongside the existing one (blue), ensuring zero overlap and no risk to the live application during deployment.

Answer

Terminate the old environment after the new environment is deployed.

Answer

Add more EC2 instances to the existing environment.

Answer

Update the existing environment with the new version.

Question 7

A development team uses AWS Elastic Beanstalk to deploy a web application. They want to perform a blue/green deployment to minimize downtime. What should they do to implement this?

Accepted Answer

Create a new environment, deploy the new version, and then swap the environment URLs.. Blue/green deployment in Elastic Beanstalk is achieved by creating a separate environment (the green environment) with the new application version, then swapping the CNAME records (URLs) of the two environments. This instantly routes traffic from the old (blue) environment to the new (green) environment with zero downtime, and allows quick rollback by swapping back.

Answer

Create an Auto Scaling group and manually replace instances.

Answer

Update the existing environment with the new version and set the deployment policy to 'Rolling'.

Answer

Use AWS CodeDeploy to perform a blue/green deployment on the EC2 instances.

Question 8

A team uses AWS CodePipeline to automate deployments. They notice that a deployment to Amazon ECS fails because the task definition is not updated. The pipeline includes a source stage from CodeCommit, a build stage using AWS CodeBuild, and a deploy stage to Amazon ECS. What is the most likely missing step?

Accepted Answer

The build stage does not output the updated task definition as an artifact.. In a CodePipeline that deploys to Amazon ECS, the build stage must output the updated task definition file (typically `imagedefinitions.json` or a task definition JSON) as an artifact. Without this artifact, the deploy stage cannot reference the new task definition revision, so it continues using the old one, causing the deployment to fail.

Answer

The pipeline has a manual approval step before deployment.

Answer

The deploy stage action is set to 'Create a new ECS service'.

Answer

The task definition is not registered in the Amazon ECS console.

Question 9

An organization uses AWS Lambda functions behind an Amazon API Gateway REST API. They want to deploy a new version of the Lambda function using canary deployments. What is the recommended approach?

Accepted Answer

Deploy the new Lambda version using AWS SAM with AutoPublishAlias and DeploymentPreference.. AWS SAM (Serverless Application Model) provides built-in support for safe Lambda deployments. By defining the `AutoPublishAlias` and `DeploymentPreference` (such as `Canary10Percent10Minutes`) in the SAM template, AWS SAM automatically configures AWS CodeDeploy to gradually shift traffic to the new Lambda version. It also monitors CloudWatch alarms and automatically rolls back if any errors are detected, making it the recommended and most robust approach.

Answer

Use AWS CodeDeploy to create a canary deployment for the Lambda function.

Answer

Use API Gateway canary release deployment to shift traffic to the new Lambda version.

Answer

Configure the Lambda function alias with traffic shifting using weights.

Question 10

A company uses AWS OpsWorks for configuration management. They have a stack with multiple layers. They want to deploy a new application version to the application layer using rolling updates. What is the correct way to achieve this?

Accepted Answer

Update the app with the new version and run the 'deploy' command on the stack.. In AWS OpsWorks, deploying a new application version to a layer is done by updating the app configuration with the new version and then running the 'deploy' command on the stack. This command triggers the built-in Chef deploy recipes on the layer's instances, performing a rolling update that installs the new application version while minimizing downtime. The 'deploy' lifecycle event is specifically designed for application deployment, unlike 'setup' which configures the instance's initial state.

Answer

Update the custom cookbook and run the 'setup' command on the layer.

Answer

Clone the stack and then delete the old stack.

Answer

Modify the Auto Scaling group to launch new instances with the updated app.

Question 11

A company uses AWS CodeBuild for building and testing their application. They have a build project that runs on a Linux environment. They want to run a build in a custom Docker image that is stored in Amazon ECR. How should they configure the build project?

Accepted Answer

In the environment configuration, set the 'Image' field to the ECR image URI.. AWS CodeBuild allows you to specify a custom Docker image from Amazon ECR by entering its URI directly in the 'Image' field under the environment configuration. This enables the build to run in a container that includes all necessary dependencies, without requiring a Dockerfile in the source code or a managed image.

Answer

Add a 'Dockerfile' to the source code and specify it in the buildspec.

Answer

Use a managed image provided by AWS CodeBuild.

Answer

Configure the pipeline to pass the image URI as an environment variable.

Question 12

Which TWO statements are true about AWS CodeDeploy deployment groups? (Choose two.)

Accepted Answer

A deployment group can use an Auto Scaling group as its target.. Option B is correct because a CodeDeploy deployment group can target an Auto Scaling group, allowing deployments to scale across the instances managed by that group. Option D is correct because a deployment group is fundamentally defined as a set of deployment targets (such as EC2 instances, on-premises instances, Lambda functions, or ECS services) associated with a single CodeDeploy application. Option A is incorrect because a deployment group can contain many instances, not just one. Option C is incorrect because a deployment group belongs to exactly one CodeDeploy application and cannot be shared across multiple applications. Option E is incorrect because a deployment group can be associated with a load balancer to manage traffic during deployments.

Answer

A deployment group can only target a single EC2 instance.

Answer

A deployment group can be shared across multiple CodeDeploy applications.

Answer

A deployment group cannot be associated with a load balancer.

Question 13

Which THREE actions are required to set up a blue/green deployment for an Amazon ECS service using AWS CodeDeploy? (Choose three.)

Accepted Answer

Create an ECS application and deployment group in CodeDeploy.. CodeDeploy requires an ECS application and deployment group to manage the deployment lifecycle, including traffic shifting and rollback. The deployment group defines the ECS service, target groups, and load balancer listener for routing traffic between blue and green environments.

Answer

Create a second ECS service for the green environment.

Answer

Create a new Application Load Balancer for the green environment.

Question 14

Which TWO AWS services can be used to automatically deploy code to Amazon EC2 instances? (Choose two.)

Accepted Answer

AWS Elastic Beanstalk. AWS Elastic Beanstalk is a PaaS service that automates the deployment of applications to EC2 instances by handling capacity provisioning, load balancing, and health monitoring. It automatically deploys code when you upload a new application version, making it a correct choice for automated deployment to EC2.

Answer

AWS CloudFormation

Answer

AWS OpsWorks

Answer

AWS CodeBuild

Question 15

An IAM policy is attached to an EC2 instance role. The instance is part of a CodeDeploy deployment group. The deployment fails because the CodeDeploy agent cannot download the revision. What is the most likely reason?

Accepted Answer

The policy does not allow s3:GetObject on the specific bucket where the revision is stored.. The CodeDeploy agent on the EC2 instance downloads the application revision from an S3 bucket. For this to succeed, the IAM role attached to the instance must include an s3:GetObject permission on the specific bucket and object. Without it, the agent cannot retrieve the revision file, causing the deployment to fail. Options A and B are irrelevant because the agent does not call CodeDeploy API actions like GetDeployment or CreateDeployment; those are used by the user or CI/CD pipeline initiating the deployment. Option C is incorrect because IAM policies for S3 actions do not require a region in the resource ARN.

Answer

The policy does not allow the codedeploy:GetDeployment action.

Answer

The policy does not allow the codedeploy:CreateDeployment action.

Answer

The policy does not specify a region in the resource ARN.