SAP-C02 Question #538: Real Exam Question with Answer & Explanation

Question

A company wants to refactor its retail ordering web application that currently has a load-balanced Amazon EC2 instance fleet for web hosting, database API services, and business logic. The company needs to create a decoupled, scalable architecture with a mechanism for retaining failed orders while also minimizing operational costs. Which solution will meet these requirements?

Options

• AUse Amazon S3 for web hosting with Amazon API Gateway for database API services. Use
• BUse AWS Elastic Beanstalk for web hosting with Amazon API Gateway for database API
• CUse Amazon S3 for web hosting with AWS AppSync for database API services. Use Amazon
• DUse Amazon Lightsail for web hosting with AWS AppSync for database API services. Use

Explanation

To create a decoupled, scalable, and cost-effective retail ordering web application with a mechanism for retaining failed orders, a serverless architecture using S3, AppSync, Lambda, and SQS is optimal.

Common mistakes.

• A. While S3, API Gateway, and Lambda are good for serverless, the option incorrectly uses SQS for 'database API services'; SQS is a messaging queue, not an API service.
• B. AWS Elastic Beanstalk involves managing underlying EC2 instances, which is not as decoupled or cost-optimized as a fully serverless approach for web hosting and increases operational overhead.
• D. Amazon Lightsail is a simplified, fixed-price solution that may not provide the full flexibility, scalability, and cost optimization capabilities required for a highly decoupled retail application, compared to dedicated serverless services.

Concept tested. Serverless, decoupled, scalable web application architecture

Reference. https://aws.amazon.com/blogs/mobile/building-a-serverless-graphql-api-with-aws-appsync/

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