DVA-C01 (Page 21)

A company hosts a microservices application that uses Amazon API Gateway.AWS Lambda, Amazon Simple Queue Service (Amazon SQS), and AmazonDynamoDB.One of the Lambda functions adds messages to an SQS FIFO queue.When a developer checks the application logs, the developer finds a few duplicated items in a DynamoDB table.The items were inserted by another polling function that processes messages from the queue.What is the MOST likely cause of this issue?Read More →

A company that has multiple offices uses an Amazon DynamoDB table to store employee payroll information. Item attributes consist of employee names, office identifiers, and cumulative daily hours worked The most frequently used query extracts a report of an alphabetical subset of employees for a specific office.Which design of the DynamoDB table primary key will have the MINIMUM performance impact?Read More →

A developer is writing an AWS Lambda function.The Lambda function needs to access items that are stored in an Amazon DynamoDB table.What is the MOST secure way to configure this access for the Lambda function?Read More →

A company has point-of-sale devices across thousands of retail shops that synchronize sales transactions with a centralized system.The system includes anAmazon API Gateway API that exposes an AWS Lambda function.The Lambda function processes the transactions and stores the transactions in Amazon RDS for MySQL.The number of transactions increases rapidly during the day and is near zero at night.How can a developer increase the elasticity of the system MOST cost-effectively?Read More →

A company is using AWS CodeDeploy for all production deployments.A developer has an Amazon Elastic Container Service (Amazon ECS) application that uses the CodeDeployDefault.ECSAIIAtOnce configuration.The developer needs to update the production environment in increments of 10% until the entire production environment is updated.Which CodeDeploy configuration should the developer use to meet these requirements?Read More →

A developer creates a customer managed key for multiple AWS users to encrypt data in Amazon S3.The developer configures Amazon Simple NotificationService (Amazon SNS) to publish a message if key deletion is scheduled.The developer needs to preserve any SNS messages that cannot be delivered so that those messages can be reprocessed.Which AWS service or feature should the developer use to meet this requirement?Read More →

An application under development is required to store hundreds of video files.The data must be encrypted within the application prior to storage, with a unique key for each video file.How should the Developer code the application?Read More →

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 company has a two-tier application running on an Amazon EC2 server that handles all of its AWS based e-commerce activity.During peak times, the backend servers that process orders are overloaded with requests.This results in some orders failing to process.A developer needs to create a solution that will re-factor the application.Which steps will allow for more flexibility during peak times, while still remaining cost-effective? (Choose two.)Read More →

An application running on multiple Amazon EC2 instances pulls messages from a standard Amazon SQS queue.A requirement for the application is that all messages must be encrypted at rest.Developers are instructed to use methods that allow for centralized key management and minimize possible support requirements whenever possible.Which of the following solutions supports these requirements?Read More →