DVA-C01 (Page 29)

A company manages a microservices application on Amazon EC2 instances.A developer has integrated the AWS X-Ray SDK with the application.The developer also has an IAM role that is associated with the EC2 instances.The role includes the AWSXRayDaemonWriteAccess managed IAM policy.When the developer queries the X-Ray traces by using the GetServiceGraph API operation, no errors and no trace data are returned.What could be the reason that no X-Ray trace data is being returned? (Choose two.)Read More →

An application is real-time processing millions of events that are received through an API.What service could be used to allow multiple consumers to process the data concurrently and MOST cost-effectively?Read More →

A company has a web application that is deployed on AWS.The application uses an Amazon API Gateway API and an AWS Lambda function as its backend.The application recently demonstrated unexpected behavior.A developer examines the Lambda function code, finds an error, and modifies the code to resolve the problem.Before deploying the change to production, the developer needs to run tests to validate that the application operates properly.The application has only a production environment available.The developer must create a new development environment to test the code changes.The developer must also prevent other developers from overwriting these changes during the test cycle.Which combination of steps will meet these requirements with the LEAST development effort? (Choose two.)Read More →

A company has an ecommerce application.To track product reviews, the company’s development team uses an Amazon DynamoDB table.Every record includes the following:• A Review ID, a 16-digit universally unique identifier (UUID)• A Product ID and User ID, 16-digit UUIDs that reference other tables• A Product Rating on a scale of 1-5• An optional comment from the userThe table partition key is the Review ID.The most performed query against the table is to find the 10 reviews with the highest rating for a given product.Which index will provide the FASTEST response for this query?Read More →

A development team set up a pipeline to launch a test environment.The developers want to automate tests for their application.The team created an AWS CodePipeline stage to deploy the application to a test environment in batches using AWS Elastic Beanstalk.A later CodePipeline stage contains a single action that uses AWS CodeBuild to run numerous automated Selenium-based tests on the deployed application.The team must speed up the pipeline without removing any of the individual tests.Which set of actions will MOST effectively speed up application deployment and testing?Read More →

A developer is deploying a company’s application to Amazon EC2 instances.The application generates gigabytes of data files each day.The files are rarely accessed, but the files must be available to the application’s users within minutes of a request during the first year of storage.The company must retain the files for 7 years.How can the developer implement the application to meet these requirements MOST cost-effectively?Read More →

A company has a two-tier application that consists of a frontend application and an Amazon RDS for MySQL database. The frontend application retrieves data from the database. The data consists of postal codes and their associated geographic coordinates The application performs many more database reads than writes. The application retrieves each postal code from the database thousands of times each day.A developer must improve the performance of the application to decrease latency.Which change should the developer make to the application to meet these requirements?Read More →

While developing an application that runs on Amazon EC2 in an Amazon VPC, a Developer identifies the need for centralized storage of application-level logs.Which AWS service can be used to securely store these logs?Read More →

A security review for a software company’s application infrastructure shows that there is no test coverage in any of the company’s deployment pipelines.A developer must fix this issue as soon as possible.The company has been integrating the AWS Cloud Development Kit (AWS CDK) into the deployment process.However, much of the pipeline still uses AWS CloudFormation templates.The developer needs to add test coverage to all the deployment code.Which solution will meet these requirements with the LEAST amount of configuration?Read More →

A company has migrated an application to Amazon EC2 instances.Automatic scaling is working well for the application user interface.However, the process to deliver shipping requests to the company’s warehouse staff is encountering issues.Duplicate shipping requests are arriving, and some requests are lost or arrive out of order.The company must avoid duplicate shipping requests and must process the requests in the order that the requests arrive.Requests are never more than 250 KB in size and take 5-10 minutes to process.A developer needs to rearchitect the application to improve the reliability of the delivery and processing of the requests.What should the developer do to meet these requirements?Read More →