DVA-C01 (Page 31)

A developer is building a static, client-side rendered website that is powered by ReactJS.The code has no server-side generated components and does not need to run any programming languages on the server.However, the code serves static HTML, CSS, and JavaScript to the client on each request.The developer’s solution to host the website must maximize performance and cost-effectiveness.Which combination of AWS services or resources should the developer use to meet these requirements?Read More →

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 (transactionID).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 PutItem does not update an existing record?Read More →

A developer is creating a template that uses AWS CloudFormation to deploy an application.The application is serverless and uses Amazon API Gateway.Amazon DynamoDB, and AWS Lambda.Which AWS service or tool should the developer use to define serverless resources in YAML?Read More →

A company has three different environments: Development.QA, and Production.The company wants to deploy its code first in the Development environment, then QA, and then Production.Which AWS service can be used to meet this requirement?Read More →

A developer is using an AWS CodePipeline pipeline to provide continuous integration and continuous delivery (CI/CD) support for a Java application.The developer needs to update the pipeline to support the introduction of a new application dependency .jar file.The pipeline must start a build when a new version of the .jar file becomes available.Which solution will meet these requirements?Read More →

A developer is writing a new serverless application for a company.Several other developers must collaborate on the code for this application, and the company expects frequent changes to the code.The developer needs to deploy the code from source control to AWS Lambda with the fewest number of manual steps.Which strategy for the build and deployment should the developer use to meet these requirements?Read More →

Two containerized microservices are hosted on Amazon EC2 ECS.The first microservice reads an Amazon RDS Aurora database instance, and the second microservice reads an Amazon DynamoDB table.How can each microservice be granted the minimum privileges?Read More →

A developer is writing a web application that allows users to sign in.The application will run on Amazon EC2 instances behind an Application Load Balancer (ALB).The instances will run in an Auto Scaling group across multiple Availability Zones.How can the developer ensure that users stay signed in when the Auto Scaling group is scaled down?Read More →

A developer is designing an AWS Lambda function to perform a maintenance activity.The developer will use Amazon EventBridge (Amazon CloudWatch Events) to invoke the function on an hourly schedule.The developer wants the function to log information at different levels of detail according to the value of a log level variable.The developer must design the function so that the log level can be set without requiring a change to the function code.Which solution will meet these requirements?Read More →

An AWS Lambda function accesses two Amazon DynamoDB tables.A developer wants to improve the performance of the Lambda function by identifying bottlenecks in the function.How can the developer inspect the timing of the DynamoDB API calls?Read More →