Environment is a
combination of 3 layers.
-Presentation Layer
-Business Layer
-Database Layer
Types of Environment
There are 4 types
of environments.
i)
Stand
alone Environment / One – tier Architecture.
ii)
Client
– Server Environment / Two – tier Architecture.
iii)
Web
Environment / Three – tier Architecture.
iv)
Distributed
Environment / N – tier 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:
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