AWS Certified Solutions Architect – Professional (SAP-C02) — Question 104

A company has an asynchronous HTTP application that is hosted as an AWS Lambda function. A public Amazon API Gateway endpoint invokes the Lambda function. The Lambda function and the API Gateway endpoint reside in the us-east-1 Region. A solutions architect needs to redesign the application to support failover to another AWS Region.

Which solution will meet these requirements?

Answer options

• A. Create an API Gateway endpoint in the us-west-2 Region to direct traffic to the Lambda function in us-east-1. Configure Amazon Route 53 to use a failover routing policy to route traffic for the two API Gateway endpoints.
• B. Create an Amazon Simple Queue Service (Amazon SQS) queue. Configure API Gateway to direct traffic to the SQS queue instead of to the Lambda function. Configure the Lambda function to pull messages from the queue for processing.
• C. Deploy the Lambda function to the us-west-2 Region. Create an API Gateway endpoint in us-west-2 10 direct traffic to the Lambda function in us-west-2. Configure AWS Global Accelerator and an Application Load Balancer to manage traffic across the two API Gateway endpoints.
• D. Deploy the Lambda function and an API Gateway endpoint to the us-west-2 Region. Configure Amazon Route 53 to use a failover routing policy to route traffic for the two API Gateway endpoints.

Correct answer: D

Explanation

Option D is correct because it involves deploying both the Lambda function and the API Gateway endpoint in the us-west-2 Region, allowing for proper failover capabilities. Options A and C do not adequately create a failover situation since they still rely on the us-east-1 Region. Option B introduces an SQS queue but does not address the need for a failover setup between regions.