What should the developer do to meet these requirements?

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In: DVA-C01
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A company has moved a legacy on-premises application to AWS by performing a lift and shift.The application exposes a REST API that can be used to retrieve billing information.The application is running on a single Amazon EC2 instance.The application code cannot support concurrent invocations.Many clients access the API, and the company adds new clients all the time.A developer is concerned that the application might become overwhelmed by too many requests.The developer needs to limit the number of requests to the API for all current and future clients.The developer must not change the API, the application, or the client code.

What should the developer do to meet these requirements?

Place the API behind an Amazon API Gateway API. Set the server-side throttling limits.

Place the API behind a Network Load Balancer. Set the target group throttling limits.

Place the API behind an Application Load Balancer. Set the target group throttling limits.

Place the API behind an Amazon API Gateway API. Set the per-client throttling limits.

Explanations:

API Gateway provides built-in throttling capabilities and can limit the number of requests to the API. Server-side throttling can be set to manage overall request rates, which helps prevent the API from being overwhelmed.

A Network Load Balancer (NLB) is designed to handle high volumes of TCP traffic and cannot directly limit the rate of HTTP requests, making it unsuitable for throttling API requests.

While an Application Load Balancer (ALB) can distribute HTTP(S) traffic, it does not offer request throttling capabilities for controlling the rate of incoming requests.

API Gateway supports per-client throttling, but this option implies that the developer wants to apply the limit universally for all clients, which can be achieved by setting server-side throttling limits instead.

2026-03-27

2 Comments

  1. Jerry
    Author

    As far as I can tell, the answer is:
    Place the API behind an Amazon API Gateway API. Set the server-side throttling limits.

  2. Robert
    Author

    In my opinion, the answer is:
    Place the API behind an Amazon API Gateway API. Set the server-side throttling limits.

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