In network architecture, what does a 2-tier design typically consist of?

A 2-tier network architecture typically consists of a client communicating with a single server. In this model, the client directly communicates with the server to access the application logic and data storage. The architecture is straightforward, usually comprising a user interface on the client side and the application and database functionalities residing on the server side.

This design is prevalent in smaller applications where simplicity and direct communication between the client and server can efficiently handle the requirements. The two tiers represent these distinct layers: the client layer for the user's interaction and the server layer for processing requests and managing data.

Other options denote more complex or different architectural structures. For example, multiple applications connected to one database implies a multi-tier setup where application logic could be distributed, requiring more than two layers. Similarly, several isolated networks sharing a common interface suggests a more intricate arrangement than a basic client-server interaction. Layered security measures indicate a focus on security architecture rather than the structural organization of client and server components within a 2-tier system.