DVA-C02 Deployment Practice Test 4 — 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?

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

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 shared dependencies to a layer, the individual function code deployment packages become smaller, and the dependencies can be easily shared across multiple functions. Note that while layers make deployment packages smaller and allow console editing, they do not reduce cold start times because Lambda still has to download and extract the layers during a cold start.

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.. 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.. 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.. 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.

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Add more EC2 instances to the existing environment.

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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.. During an in-place deployment on EC2 instances behind an Application Load Balancer (ALB), CodeDeploy can prevent traffic from being routed to instances while they are being updated. To do this, the deployment group must be explicitly associated with the ALB's target group. If this association is missing, CodeDeploy will perform the deployment without deregistering the instances from the target group. Consequently, the load balancer continues to route user traffic to the instances while the application is stopped and updated, resulting in 502 Bad Gateway errors.

Answer

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

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The deployment configuration is set to CodeDeployDefault.OneAtATime.

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The CodeDeploy agent is not installed on the EC2 instances.

Question 6

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 7

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'.. The 'Rollback on failure' option, when set to 'Enabled' in the AWS CloudFormation console, instructs CloudFormation to automatically revert the stack to its previous working state if the stack update fails. Conversely, setting 'Disable rollback' to 'Enabled' (or True) would prevent the stack from rolling back, leaving it in a failed state for troubleshooting.

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 8

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

docker-compose.yml. On modern AWS Elastic Beanstalk platforms (Amazon Linux 2 and Amazon Linux 2023), multi-container Docker deployments are configured using a standard `docker-compose.yml` file. The legacy `Dockerrun.aws.json` (v2) was used for the now-retired Multi-container Docker platform on Amazon Linux 1.

Answer

Dockerrun.aws.json

Answer

Dockerfile

Answer

env.yaml

Question 9

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.. 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 10

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 11

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 12

A developer runs the AWS CLI command shown in the exhibit. The deployment is created successfully, but the CodeDeploy agent on the target instances does not download the revision. What is the most likely cause?

Accepted Answer

The S3 object version is not specified.. If the S3 bucket has versioning enabled, you must specify the object version (using --s3-location versionId) to uniquely identify the revision. Without it, the CodeDeploy agent cannot determine which version to download. Option A is incorrect: the bundle type can be zip or tar, and the command uses 'zip', which is valid. Option B is incorrect: there is no indication the bucket name is incorrect; the command succeeded in creating the deployment. Option C is incorrect: the deployment group name is provided and seems correct since the deployment was created successfully. Thus, the most likely cause is that the S3 object version is missing.

Answer

The bundle type should be 'tar' instead of 'zip'.

Answer

The bucket name is incorrect.

Answer

The deployment group name is misspelled.

Question 13

A CloudFormation template defines a Lambda function and a version resource. After updating the function code in the S3 bucket, the developer updates the stack. The Lambda function is updated, but the version resource remains unchanged. What is the most likely reason?

Accepted Answer

The template should use AutoPublishAlias to create versions.. In AWS CloudFormation, the AWS::Lambda::Version resource is immutable and its properties (such as FunctionName) do not change when the underlying function's code is updated. Because CloudFormation does not detect any property changes on the AWS::Lambda::Version resource, it does not trigger an update or recreation of that resource. To force CloudFormation to create a new Lambda version, you must change the logical ID of the AWS::Lambda::Version resource (for example, by appending a hash or version number to the logical ID) during the template update.

Answer

The function code changed, but CloudFormation does not detect the change because the S3 key is the same.

Answer

The version resource is created before the function update completes.

Answer

The version resource has a DependsOn clause that prevents it from updating.

Question 14

A company is deploying a new microservice using AWS Lambda. The deployment pipeline uses AWS CodeBuild and AWS CodePipeline. The team wants to automatically roll back to the previous function version if the new version fails CloudWatch alarms. Which deployment strategy should they implement?

Accepted Answer

Canary deployment with a CloudWatch alarm-based rollback. Canary deployment with a CloudWatch alarm-based rollback. AWS Lambda supports canary deployments via traffic shifting, where a small percentage of traffic is gradually shifted to the new function version. If the new version triggers CloudWatch alarms (e.g., increased error rate or latency), AWS CodeDeploy can automatically roll back to the previous version. Option B is incorrect because rolling updates are not natively supported for Lambda; Lambda uses traffic shifting instead. Option C is incorrect because immutable deployments do not provide gradual traffic shifting or alarm-based rollback. Option D is incorrect because Blue/Green deployment is a broader concept, but the specific strategy requested is canary with alarm-based rollback, which is a feature of AWS CodeDeploy's Lambda deployment.

Answer

Rolling update with a pre-traffic hook

Answer

Immutable deployment with an automated rollback

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Blue/Green deployment with an AWS CodeDeploy configuration

Question 15

A developer is deploying a serverless application using the AWS Serverless Application Model (SAM). The application includes an API Gateway endpoint backed by a Lambda function. The developer wants to enable canary deployments to shift traffic gradually. Which SAM resource attribute should they configure?

Accepted Answer

DeploymentPreference. The DeploymentPreference attribute in the AWS::Serverless::Function resource allows configuring canary deployments with CodeDeploy. Option B is incorrect because StageName is used to set the API Gateway stage name, not for canary deployments. Option C is incorrect because Events define event sources that trigger the Lambda function, not traffic shifting. Option D is incorrect because AutoPublishAlias enables automatic alias creation for versioning but does not handle canary traffic shifting.

Answer

StageName

Answer

Events

Answer

AutoPublishAlias