Free Amazon DVA-C02 Exam Questions

Question 1

A developer needs to create a serverless application that uses an event-driven architecture.

How can the developer configure the application to automatically receive and process events?

A : eate an Amazon SQS queue and publish events to the queue. Configure an Amazon EC2 instance to poll the queue and consume the messages.

B : eate an Amazon SQS topic and an Amazon EC2 instance. Subscribe the instance to the SNS topic and submit events to the topic.

C : Create an Amazon SNS topic and an AWS Lambda function. Configure an HTTP endpoint on the Lambda function and subscribe the HTTP endpoint to the SNS topic. Submit events to the SNS topic.

D : eate an Amazon SNS topic and an AWS Lambda function. Subscribe the Lambda function to the SNS topic and submit events to the SNS topic.

Answer: D

Question 2

A company wants to use AWS AppConfig to gradually deploy a new feature to 15% of users to test the feature before a full deployment. Which solution will meet this requirement with the LEAST operational overhead?

A : Set up a custom script within the application to randomly select 15% of users. Assign a flag for the new feature to the selected users.

B : Create separate AWS AppConfig feature flags for both groups of users. Configure the flags to target 15% of users.

C : Create an AWS AppConfig feature flag. Define a variant for the new feature, and create a rule to target 15% of users.

D : Use AWS AppConfig to create a feature flag without variants. Implement a custom traffic splitting mechanism in the application code.

Answer: C

Question 3

A company is using Amazon RDS as the backend database for its application. After a recent marketing campaign, a surge of read requests to the database increased the latency of data retrieval from the database. The company has decided to implement a caching layer in front of the database. The cached content must be encrypted and must be highly available.

Which solution will meet these requirements?

A : Amazon CloudFront

B : Amazon ElastiCache for Memcached

C : Amazon ElastiCache for Redis in cluster mode

D : Amazon DynamoDB Accelerator (DAX)

Answer: C

Question 4

A company is expanding the compatibility of its photo-snaring mobile app to hundreds of additional devices with unique screen dimensions and resolutions. Photos are stored in Amazon S3 in their original format and resolution. The company uses an Amazon CloudFront distribution to serve the photos The app includes the dimension and resolution of the display as GET parameters with every request. A developer needs to implement a solution that optimizes the photos that are served to each device to reduce load time and increase photo quality. Which solution will meet these requirements MOST cost-effective?

A : Use S3 Batch Operations to invoke an AWS Lambda function to create new variants of the photos with the required dimensions and resolutions. Create a dynamic CloudFront origin that automatically maps the request of each device to the corresponding photo variant.

B : Use S3 Batch Operations to invoke an AWS Lambda function to create new variants of the photos with the required dimensions and resolutions. Create a Lambda@Edge function to route requests to the corresponding photo variant by using request headers.

C : Create a Lambda@Edge function that optimizes the photos upon request and returns the photos as a response. Change the CloudFront TTL cache policy to the maximum value possible.

D : Create a Lambda@Edge function that optimizes the photos upon request and returns the photos as a response. In the same function, store a copy of the processed photos on Amazon S3 for subsequent requests.

Answer: D

Question 5

A company has a serverless application that uses Amazon API Gateway and AWS Lambda functions to expose a RESTful API. The company uses a continuous integration and continuous delivery (CI/CD) workflow to deploy the application to multiple environments. The company wants to implement automated integration tests after deployment. A developer needs to set up the necessary infrastructure and processes to automate the deployment and integration tests for the serverless application.

A : Configure API Gateway stages to represent each application environment. Use AWS SAM templates to manage the infrastructure for the Lambda functions and API resources. Use AWS CodeBuild to implement automated deployment tests to validate the deployments in each stage.

B : Configure API Gateway stages to represent each application environment. Use AWS CloudFormation to manage the infrastructure for the Lambda functions and API resources. Use AWS CodeBuild to implement automated deployment tests to validate the deployments in each stage.

C : Use AWS CodePipeline to create a CI/CD pipeline. Configure API Gateway stages to represent each application environment. Use AWS CloudFormation templates to manage the infrastructure for the Lambda functions and API resources. Use AWS CodeBuild to implement automated deployment tests to validate the deployments in each stage.

D : Use AWS CloudFormation to create and deploy the application infrastructure in each application environment. Use the AWS CLI to invoke Lambda functions to perform deployment tests after each deployment.

Answer: C