As a solutions architect, you need to design a multi-tier architecture for a project in AWS. The application contains three tiers: the frontend layer, business logic layer, and storage layer. Auto Scaling groups implement the front-end and business logic layers. AWS RDS is selected as the storage layer. The front-end layer is in public subnets. The backend and data storage layers are in private subnets. Which of the following options is NOT a feature of this architecture?

Answer options:

A.Each layer is modularized and managed independently.
B.The backend and data storage are not exposed to the internet and protected in private subnets.
C.In this architecture, users do not have to configure the desired number of servers or capabilities.
D.Frontend and backend servers can be configured in different availability zones for high availability.

Correct Answer – C
The multi-tier architecture in AWS has several features such as high availability and scalability, fault-tolerant, and security. The question asks for the option that is NOT a feature.
Option C should be selected as the users need to configure the min/max/desired number of servers in ASGs and the read/write capabilities for the RDS database.
Option A is incorrect because the application is divided into three components, and each component works independently.
Option B is incorrect because the backend and data storage are located in private subnets. Users can only reach the frontend layer.
Option C is CORRECT Refer to the above explanations. This architecture is not a serverless architecture.
Option D is incorrect because the servers in ASG can be put into several availability zones, even if one AZ has an outage, the servers in other AZs can still work as normal.
Sample Architecture
Reference:
https://docs.aws.amazon.com/whitepapers/latest/serverless-multi-tier-architectures-api-gateway-lambda/single-page-application.html