AWS Certified Solutions Architect – Professional (SAP-C02) — Question 296

A company is building an application that will run on an AWS Lambda function. Hundreds of customers will use the application. The company wants to give each customer a quota of requests for a specific time period. The quotas must match customer usage patterns. Some customers must receive a higher quota for a shorter time period.

Which solution will meet these requirements?

Answer options

• A. Create an Amazon API Gateway REST API with a proxy integration to invoke the Lambda function. For each customer, configure an API Gateway usage plan that includes an appropriate request quota. Create an API key from the usage plan for each user that the customer needs.
• B. Create an Amazon API Gateway HTTP API with a proxy integration to invoke the Lambda function. For each customer configure an API Gateway usage plan that includes an appropriate request quota Configure route-level throttling for each usage plan. Create an API Key from the usage plan for each user that the customer needs.
• C. Create a Lambda function alias for each customer. Include a concurrency limit with an appropriate request quota. Create a Lambda function URL for each function alias. Share the Lambda function URL for each alias with the relevant customer.
• D. Create an Application Load Balancer (ALB) in a VPC. Configure the Lambda function as a target for the ALB. Configure an AWS WAF web ACL for the ALB. For each customer configure a rale-based rule that includes an appropriate request quota.

Correct answer: A

Explanation

Amazon API Gateway REST APIs natively support usage plans and API keys, which allow administrators to define custom request quotas and throttling limits for individual customers or tiers. HTTP APIs do not support usage plans, making Option B incorrect. AWS WAF rate-based rules and Lambda concurrency limits are designed for rate limiting and resource protection, respectively, rather than managing granular, business-level request quotas for hundreds of individual clients.