DVA-C02 Deployment Practice Test 9 — 15 Questions

Question 1

A developer is deploying a Python application to AWS Lambda. The application has several dependencies. The developer wants to ensure that the deployment package is as small as possible to reduce cold start times. What should the developer do?

Accepted Answer

Use Lambda Layers to manage dependencies separately from the function code.. Lambda Layers allow you to package and manage dependencies (like Python libraries) separately from your function code. By moving dependencies to a layer, the function code deployment package becomes smaller, which reduces the time Lambda spends downloading and extracting the package during cold starts. Layers are cached across executions, further improving performance.

Answer

Use an S3 bucket to store the deployment package.

Answer

Use AWS CodeBuild to optimize the package.

Answer

Include all dependencies in the deployment package.

Question 2

A developer is using AWS CodePipeline to deploy a web application. The pipeline has a source stage from Amazon S3, a build stage using AWS CodeBuild, and a deploy stage using AWS CodeDeploy. The developer notices that the deploy stage fails intermittently due to EC2 instances not being available. Which TWO actions should the developer take to improve the reliability of the deployment? (Choose two.)

Accepted Answer

Configure the CodeDeploy deployment group to have a minimum healthy hosts threshold.. Option B is correct because configuring a minimum healthy hosts threshold in the CodeDeploy deployment group ensures that a certain percentage or number of EC2 instances remain healthy during the deployment. This prevents the deployment from proceeding if too many instances are unavailable, reducing the risk of failure due to insufficient capacity. Option E is correct because adding a manual approval step before the deploy stage allows the developer to verify instance health (e.g., via AWS Systems Manager or custom scripts) before triggering the deployment, catching availability issues early.

Answer

Increase the number of EC2 instances in the Auto Scaling group to ensure availability.

Answer

Reduce the deployment timeout to fail faster.

Answer

Use a different deployment type, such as blue/green, instead of in-place.

Question 3

A company is deploying a containerized application on Amazon ECS using AWS Fargate. The application needs to handle variable traffic. The developer wants to set up automatic scaling based on CPU utilization. Which THREE steps are required to achieve this? (Choose three.)

Accepted Answer

Create a CloudWatch alarm for CPUUtilization metric.. Option B is correct because a CloudWatch alarm for the CPUUtilization metric is required to trigger the scaling action. This alarm monitors the average CPU utilization of the ECS service and, when breached, invokes the Application Auto Scaling policy to adjust the desired count. Without this alarm, the scaling policy has no trigger to act upon.

Answer

Update the ECS service to set the desired count to a static value.

Answer

Define a task definition with CPU and memory limits.

Question 4

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.. Option C is correct because 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 5

A company is deploying a new microservice using AWS CodeDeploy. The deployment group uses an EC2/On-Premises compute platform with an in-place deployment configuration. After the deployment, the new application version is not receiving traffic. The previous version continues to serve requests. What is the most likely cause?

Accepted Answer

The deployment group is not associated with a load balancer or target group.. In an in-place deployment with CodeDeploy on the EC2/On-Premises compute platform, traffic is routed to the new application version by a load balancer. If the deployment group is not associated with a load balancer or target group, CodeDeploy cannot register the instances or shift traffic to the new version, so the previous version continues serving requests. The deployment itself may succeed, but without the load balancer integration, the new application revision never receives incoming traffic.

Answer

The application revision is not stored in the correct S3 bucket.

Answer

The deployment configuration is set to CodeDeployDefault.OneAtATime.

Answer

The CodeDeploy agent is not installed on the EC2 instances.

Question 6

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.. Option D is correct because 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 7

A company uses AWS CloudFormation to deploy infrastructure. They have a stack that creates an Amazon RDS DB instance. They want to update the DB instance class without downtime. Which update policy should they use?

Accepted Answer

UseLatestRestorableTime. Option A is correct because the `UseLatestRestorableTime` update policy is used with AWS CloudFormation to perform an update that replaces the DB instance with the latest restorable time snapshot, which minimizes downtime by allowing the new instance to be created from the most recent automated backup. This policy is specifically designed for RDS instances to enable a blue/green deployment-like update without manual intervention, ensuring the database remains available during the transition.

Answer

AutoScalingRollingUpdate

Answer

UpdateReplacePolicy

Answer

CreationPolicy

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.. Option D is correct because 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

Configure the Lambda function alias with traffic shifting using weights.. Option D is correct because Lambda function aliases support traffic shifting by assigning weights to different versions, enabling canary deployments without external services. This is the native AWS mechanism for gradually routing a percentage of invocations to a new version while monitoring for errors, then shifting all traffic once stable.

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

Deploy the new Lambda version using AWS SAM with AutoPublishAlias and DeploymentPreference.

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.. Option C is correct because 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 developer is using AWS CloudFormation to create a stack. They want to update the stack but need to ensure that if the update fails, the stack is automatically rolled back to the previous state. Which stack option should they configure?

Accepted Answer

Set the 'Rollback on failure' option to 'Yes'.. Option B is correct because the 'Rollback on failure' option, when set to 'Yes', instructs AWS CloudFormation to automatically revert the stack to its previous working state if the stack update fails. This ensures that any changes that cause errors are undone, maintaining stack stability without manual intervention.

Answer

Configure SNS notification topics for the stack.

Answer

Set the 'Disable rollback' option to 'No'.

Answer

Define a stack policy that protects critical resources.

Question 12

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.. Option B is correct because 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 13

A team uses AWS Elastic Beanstalk with a Docker platform. They want to deploy a multi-container Docker application. What file is required to define the container configuration?

Accepted Answer

Dockerrun.aws.json. AWS Elastic Beanstalk uses the `Dockerrun.aws.json` file to define the configuration for multi-container Docker environments. This JSON file specifies the images to use, port mappings, links between containers, and volumes, and it is required when deploying a multi-container Docker application on Elastic Beanstalk.

Answer

docker-compose.yml

Answer

Dockerfile

Answer

env.yaml

Question 14

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 AWS CodeDeploy deployment groups can target an Auto Scaling group, enabling automatic deployment to all instances in the group and integration with scaling events. This allows CodeDeploy to automatically deploy revisions to new instances launched by the Auto Scaling group, ensuring consistent application versions across the fleet.

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 15

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.. Option B is correct because 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.