DVA-C02 (Page 21)

A developer has created an AWS Lambda function that is written in Python.The Lambda function reads data from objects in Amazon S3 and writes data to an Amazon DynamoDB table.The function is successfully invoked from an S3 event notification when an object is created.However, the function fails when it attempts to write to the DynamoDB table.What is the MOST likely cause of this issue?Read More →

A developer has an application that uses WebSocket APIs in Amazon API Gateway.The developer wants to use an API Gateway Lambda authorizer to control access to the application.The developer needs to add credential caching and reduce repeated usage of secret keys and authorization tokens on every request.Which combination of steps should the developer take to meet these requirements? (Choose two.)Read More →

A company uses an AWS CloudFormation template to deploy and manage its AWS infrastructure.The CloudFormation template creates Amazon VPC security groups and Amazon EC2 security groups.A manager finds out that some engineers modified the security groups of a few EC2 instances for testing purposes.A developer needs to determine what modifications occurred.Which solution will meet this requirement?Read More →

A developer uses an AWS Lambda function in an application to edit users’ uploaded photos.The developer needs to update the Lambda function code and needs to test the updates.For testing, the developer must divide the user traffic between the original version of the Lambda function and the new version of the Lambda function.Which combination of steps will meet these requirements? (Choose two.)Read More →

A company that has large online business uses an Amazon DynamoDB table to store sales data.The company enabled Amazon DynamoDB Streams on the table.The transaction status of each sale is stored in a TransactionStatus attribute in the table.The value of the TransactionStatus attribute must be either failed, pending, or completed.The company wants to be notified of failed sales where the Price attribute is above a specific threshold.A developer needs to set up notification for the failed sales.Which solution will meet these requirements with the LEAST development effort?Read More →

A developer wants the ability to roll back to a previous version of an AWS Lambda function in the event of errors caused by a new deployment.How can the developer achieve this with MINIMAL impact on users?Read More →

A company launched an online portal to announce a new product that the company will release in 6 months.The portal requests that users enter an email address to receive communications about the product.The company needs to create a REST API that will store the email addresses in Amazon DynamoDB.A developer has created an AWS Lambda function that can store the email addresses.The developer will deploy the Lambda function by using the AWS Serverless Application Model (AWS SAM).The developer must provide access to the Lambda function over HTTP.Which solutions will meet these requirements with the LEAST additional configuration? (Choose two.)Read More →

A company used AWS to develop an application for customers.The application includes an Amazon API Gateway API that invokes AWS Lambda functions.The Lambda functions process data and store the data in Amazon DynamoDB tables.The company must monitor the entire application to identify potential bottlenecks in the architecture that can negatively affect customers.Which solution will meet this requirement with the LEAST development effort?Read More →

A developer needs to modify an application architecture to meet new functional requirements.Application data is stored in Amazon DynamoDB and processed for analysis in a nightly batch.The system analysts do not want to wait until the next day to view the processed data and have asked to have it available in near-real time.Which application architecture pattern would enable the data to be processed as it is received?Read More →

A developer has written a distributed application that uses microservices.The microservices are running on Amazon EC2 instances.Because of message volume, the developer is unable to match log output from each microservice to a specific transaction.The developer needs to analyze the message flow to debug the application.Which combination of steps should the developer take to meet this requirement? (Choose two.)Read More →