Skip to Content

AWS SAA-C03: Cost-Effective Web Application Building on AWS

By: Author Alex Lim

Posted on

Categories Exam

Learn how to build a cost-effective web application on AWS using AWS Lambda, Amazon DynamoDB, Amazon Cognito, and AWS Amplify.

Table of Contents

Question

A company wants to build a web application on AWS. Client access requests to the website are not predictable and can be idle for a long time. Only customers who have paid a subscription fee can have the ability to sign in and use the web application.

Which combination of steps will meet these requirements MOST cost-effectively? (Choose three.)

A. Create an AWS Lambda function to retrieve user information from Amazon DynamoDB. Create an Amazon API Gateway endpoint to accept RESTful APIs. Send the API calls to the Lambda function.
B. Create an Amazon Elastic Container Service (Amazon ECS) service behind an Application Load Balancer to retrieve user information from Amazon RDS. Create an Amazon API Gateway endpoint to accept RESTful APIs. Send the API calls to the Lambda function.
C. Create an Amazon Cognito user pool to authenticate users.
D. Create an Amazon Cognito identity pool to authenticate users.
E. Use AWS Amplify to serve the frontend web content with HTML, CSS, and JS. Use an integrated Amazon CloudFront configuration.
F. Use Amazon S3 static web hosting with PHP, CSS, and JS. Use Amazon CloudFront to serve the frontend web content.

Answer

A. Create an AWS Lambda function to retrieve user information from Amazon DynamoDB. Create an Amazon API Gateway endpoint to accept RESTful APIs. Send the API calls to the Lambda function.
C. Create an Amazon Cognito user pool to authenticate users.
E. Use AWS Amplify to serve the frontend web content with HTML, CSS, and JS. Use an integrated Amazon CloudFront configuration.

Explanation

The most cost-effective steps to meet these requirements are:

  • Option A: Create an AWS Lambda function to retrieve user information from Amazon DynamoDB. Create an Amazon API Gateway endpoint to accept RESTful APIs. Send the API calls to the Lambda function. This approach is cost-effective as you only pay for the compute time you consume with AWS Lambda and Amazon DynamoDB, and there is no charge when your code is not running.
  • Option C: Create an Amazon Cognito user pool to authenticate users. Amazon Cognito User Pools provide a secure user directory that scales to hundreds of millions of users. It is a simple, cost-effective option for developers who want to delegate user authentication.
  • Option E: Use AWS Amplify to serve the frontend web content with HTML, CSS, and JS. Use an integrated Amazon CloudFront configuration. AWS Amplify enables developers to develop and deploy cloud-powered mobile and web apps. The Amplify Console provides a Git-based workflow for building, deploying, and hosting your app.

Amazon AWS Certified Solutions Architect – Associate SAA-C03 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Amazon AWS Certified Solutions Architect – Associate SAA-C03 exam and earn Amazon AWS Certified Solutions Architect – Associate SAA-C03 certification.