Learn AWS Serverless Computing

N-tier – achieve individual scale

With the introduction of virtual machines also came software-defined networking. This gave us more flexibility in how we can build, configure, and scale networks. With the network also being virtual, we weren't bound by the requirement to have certain types of workloads on specific servers. Our public and private resources could now reside on the same physical server because of the hardware abstraction that was introduced by the hypervisor.

This means we can build more secure applications by separating the tiers of workloads. Our load balancing or web layer can be separated from the backend application server logic and data stores by a network barrier. We can hide the databases behind a network boundary ...