AWS Certified Solutions Architect - Associate SAA-C03 — Topic 1 Question 10

Question

A company is building an ecommerce web application on AWS. The application sends information about new orders to an Amazon API Gateway REST API to process. The company wants to ensure that orders are processed in the order that they are received. Which solution will meet these requirements?

Accepted Answer

Correct answer: B. Correct: B. 'Processed in the order received' requires a FIFO queue: an API Gateway to SQS FIFO integration preserves exact ordering (and exactly-once processing) before Lambda consumes the messages. A (SNS) and D (SQS standard) provide only best-effort ordering. C (blocking requests with an authorizer) is not how you enforce processing order and would break the API.

AWS Certified Solutions Architect - Associate SAA-C03 — Question 10