Amazon DVA-C01 Practice Test - Questions Answers, Page 58
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A company is creating a continuous integration and continuous delivery (CI/CD) process by using AWS CodePipeline for its application on AWS The CI/CD process will pull code from an AWS CodeCommit repository, create the application infrastructure by using AWS Cloud Formation, deploy the frontend code to an Amazon S3 bucket that is configured for static website hosting, and deploy the application backend on an Amazon Elastic Container Service (Amazon ECS) cluster.
A developer needs to create a new CodePipeline stage that creates the application infrastructure.
Which solution will meet these requirements with the LEAST operational overhead?
A developer wants to implement authentication using Amazon Cognito user pools for an existing API in Amazon API Gateway. After creating the Amazon Cognito user pool, the developer tests the GET request to the API. Unauthenticated requests to the API return a 200 OK status response.
Which combination of additional steps are required to complete the authentication implementation?
(Select TWO.)
A company is building an application for stock trading. The application needs sub-millisecond latency for processing trade requests. The company uses Amazon DynamoDB 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?
A developer is building varKHJS microservices for an application that will run on Amazon EC2 instances. The developer needs to monitor the end-to-end view of the requests between the microservices and debug any issues in the various microservices.
What should the developer do to accomplish these tasks?
An application adds a processing date to each transaction that it receives. The application writes each transaction to an Amazon DynamoDB table by using the Putitem operation. Each transaction has a unique ID (transactionlD). Sometimes the application receives transactions more than once.
A developer notices that duplicate transactions in DynamoDB have the latest processing date instead of the date when the transaction was first received. Duplicate records happen infrequently, and most of the transactions are unique. What is the MOST cost-effective solution that the developer can implement to ensure that Putltem does not update an existing record?
A developer is exposing an API by using Amazon API Gateway and AWS Lambda as the backend for an application. The developer wants to add validation rules for a POST method to ensure that the data (rom the frontend web form is valid. The validation rules must include mandatory fields, data type, length, and regular expressions. Which solution will meet these requirements?
A developer is writing an application that stores data in an Amazon DynamoDB table by using the Putltem API operation. The table has a partition key of streamlD and has a sort key of seqlD. The developer needs to make sure that the Putltem invocation does not overwrite the existing partition key and sort key.
Which condition expression will maintain the uniqueness of the partition key and the sort key?
A developer created a web API that receives requests by using an internet-facing Application Load Balancer (ALB) with an HTTPS listener. The developer configures an Amazon Cognito user pool and wants to ensure that every request to the API is authenticated through Amazon Cognito.
What should the developer do to meet this requirement?
A company manages a financial services application that stores a large volume of data in an Amazon DynamoDB table. A developer needs to improve the performance of the DynamoDB read queries without increasing the cost. Which solution meets these requirements?
A distributed application includes an AWS Lambda function that runs successfully in the DEV environment with 128 MB of memory assigned. The same function is failing in the TEST environment. The developer is monitoring the application using AWS X-Ray, but the Lambda function cannot be seen on the X-Ray service graph. The Lambda execution role has AWS X-Ray permissions What is the MOST LIKELY cause for AWS X-Ray not showing any data for the Lambda function?
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