Environment

ENVIRONMENT

Environment is a combination of 3 layers.
Presentation Layer.
Business Layer.
Database Layer.

Types of Environment, There are 4 types of environments.

1. Stand alone Environment / One – tire Architecture.
2. Client – Server Environment / Two – tire Architecture.
3. Web Environment / Three – tire Architecture.
4. Distributed Environment / N – tire Architecture.

1) Stand alone environment (Or) One – Tire Architecture.
This environment contains all the three layers that is Presentation layer, Business layered and Database layer in a Single tier.

2) Client – Server Environment (Or) Two – Tire Architecture
In this environment two tiers will be there one tier is for client and other tier is for Database server. Presentation layer and Business layer will be present in each and
every client and the database will be present in database server.

3) Web Environment
In this Environment three tiers will be there client resides in one tier, application server resides in middle tier and database server resides in the last tier. Every client
will have the presentation layer, application server will have the business layer and database server will have the database layer.

4) Distributed Environment
It is same as the web Environment but the business logic is distributed among application server in order to distribute the load.
Web Server: It is software that provides web services to the client.
Application Server: It is a server that holds the business logic.
Ex: Ton tact, Tomcat, Web logic, web Spear etc………