DVA-C02 (Page 37)

A developer is building an ecommerce application.When there is a sale event, the application needs to concurrently call three third-party systems to record the sale.The developer wrote three AWS Lambda functions.There is one Lambda function for each third-party system, which contains complex integration logic.These Lambda functions are all independent.The developer needs to design the application so each Lambda function will run regardless of others’ success or failure.Which solution will meet these requirements?Read More →

A developer is publishing critical log data to a log group in Amazon CloudWatch Logs.The log group was created 2 months ago.The developer must encrypt the log data by using an AWS Key Management Service (AWS KMS) key so that future data can be encrypted to comply with the company’s security policy.Which solution will meet this requirement with the LEAST effort?Read More →

A developer is working on a web application that requires selective activation of specific features.The developer wants to keep the features hidden from end users until the features are ready for public access.Which solution will meet these requirements?Read More →

A company with multiple branch locations has an analytics and reporting application.Each branch office pushes a sales report to a shared Amazon S3 bucket at a predefined time each day.The company has developed an AWS Lambda function that analyzes the reports from all branch offices in a single pass.The Lambda function stores the results in a database.The company needs to start the analysis once each day at a specific time.Which solution will meet these requirements MOST cost-effectively?Read More →

A developer is building an event-driven application by using AWS Lambda and Amazon EventBridge.The Lambda function needs to push events to an EventBridge event bus.The developer uses an SDK to run the PutEvents EventBridge action and specifies no credentials in the code.After deploying the Lambda function, the developer notices that the function is failing and there are AccessDeniedException errors in the logs.How should the developer resolve this issue?Read More →

A developer is creating a simple proof-of-concept demo by using AWS CloudFormation and AWS Lambda functions.The demo will use a CloudFormation template to deploy an existing Lambda function.The Lambda function uses deployment packages and dependencies stored in Amazon S3.The developer defined an AWS::Lambda::Function resource in a CloudFormation template.The developer needs to add the S3 bucket to the CloudFormation template.What should the developer do to meet these requirements with the LEAST development effort?Read More →

A company runs its website on AWS.The company posts daily polls on its website and publishes the poll results next day.The website stores user responses in an Amazon DynamoDB table.After the poll results are published, the company does not need to keep the user responses.A developer needs to implement a solution that will automatically remove old user responses from the DynamoDB table.The developer adds a new expiration_date attribute to the DynamoDB table.The developer plans to use the expiration_date attribute for the automation.Which solution will meet these requirements with the LEAST development effort?Read More →

A company uses an AWS Lambda function that reads messages from an Amazon Simple Queue Service (Amazon SQS) standard queue.The Lambda function makes an HTTP call to a third-party API for each message.The company wants to ensure that the Lambda function does not overwhelm the third-party API with more than two concurrent requests.Which solution will meet these requirements?Read More →

A developer is designing a serverless application that customers use to select seats for a concert venue.Customers send the ticket requests to an Amazon API Gateway API with an AWS Lambda function that acknowledges the order and generates an order ID.The application includes two additional Lambda functions: one for inventory management and one for payment processing.These two Lambda functions run in parallel and write the order to an Amazon Dynamo DB table.The application must provide seats to customers according to the following requirements.If a seat is accidently sold more than once, the first order that the application received must get the seat.In these cases, the application must process the payment for only the first order.However, if the first order is rejected during payment processing, the second order must get the seat.In these cases, the application must process the payment for the second order.Which solution will meet these requirements?Read More →

A company is expanding the compatibility of its photo-sharing 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-effectively?Read More →