DVA-C01 (Page 35)

A company built an online event platform.For each event, the company organizes quizzes and generates leaderboards that are based on the quiz scores.The company stores the leaderboard data in Amazon DynamoDB and retains the data for 30 days after an event is complete.The company then uses a scheduled job to delete the old leaderboard dataThe DynamoDB table is configured with a fixed write capacity.During the months when many events occur, the DynamoDB write API requests are throttled when the scheduled delete job runs.A developer must create a long-term solution that deletes the old leaderboard data and optimizes write throughput.Which solution meets these requirements?Read More →

A new mobile app uses Amazon Cognito web identity federation.Immediately after a user logs in, the following error occurs:AccessDenied — Not authorized to perform sts:AssumeRoleWithWebIdentityA developer determines that the Amazon Cognito configuration appears to be correct.Which of the following could be the cause of the error?Read More →

A company is planning to use AWS CodeDeploy to deploy an application to Amazon Elastic Container Service (Amazon ECS).During the deployment of a new version of the application, the company initially must expose only 10% of live traffic to the new version of the deployed application.Then, after 15 minutes elapse, the company must route all the remaining live traffic to the new version of the deployed application.Which CodeDeploy predefined configuration will meet these requirements?Read More →

A company is building an application for stock trading.The application needs sub-millisecond latency for processing trade requests.The company uses AmazonDynamoDB to store all the trading data that is used to process each trading request.A development team performs load testing on the application and finds that the data retrieval time is higher than expected.The development team needs a solution that reduces the data retrieval time with the least possible effort.Which solution meets these requirements?Read More →

A developer is planning to use an Amazon API Gateway and AWS Lambda to provide a REST API.The developer will have three distinct environments to manage: development, test, and production.How should the application be deployed while minimizing the number of resources to manage?Read More →

A developer needs to build an AWS CloudFormation template that self-populates the AWS Region variable that deploys the CloudFormation template.What is the MOST operationally efficient way to determine the Region in which the template is being deployed?Read More →

A developer registered an AWS Lambda function as a target for an Application Load Balancer (ALB) using a CLI command.However, the Lambda function is not being invoked when the client sends requests through the ALB.Why is the Lambda function not being invoked?Read More →