Two-Tier Architecture

In case of two-tier architecture, an application is broadly divided into two

• Client:Implements the user interface
• Server:Storage of data

In case of this architecture the user and data services are either on the same machine or on the different machines.In two-tier architecture,the business layers are implemented in either of the following methods:

1. Fat Client

   In this type of method business service layer is combined with user service layer.Clients execute the presentation logic and enforce business logic.server stores data and process transactions.this is used when server is loaded with transaction processing activities and is not equipped to process business logic

2. Fat Server

   Here business service layer is combined with data service layer.As business service is stored on the server, most of the processing takes place on server.

3. Dividing business services between the user and data services

   You can also implemented in such a way that business services are distributed between user and data services.Here processing of business logic is distributed between data and user services.