- Stand alone environment or One-tier environment
- Client –server environment or Two-tier Architecture
- Web environment or Three-tier Architecture
- Distributed environment or N-tier Architecture
a. Stand Alone environment: -
In this type of environment all the three layers that is presentation layer, Business layer& Database layer will be present in al single tier. This type of environment is suitable for single user application.
One-Tier Architecture
PL BL ÞOne tier Architecture
DBL
DBL
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b. Client –server environment:
In this type of environments there will be two tiers, one tier is for clients and other tier is for database servers. The presentation layer and the business layer will be present in each and every client . The database layer will be present in the database server. This type of environment is suitable for multi user application in a single or a limited area.
Two tier Architecture
c. Web environment: In his type of environment three tiers will be there. One is for client’s the middle one is for application server and the other one is for database servers. Presentation layer will be present at clients, Business layer will be present in the application server, and database layer will be present at the database servers. This type of environment is suitable for the applications that are used all over the world by limited number users
Three-tier Architecture:
Web server: -
It is software, which provides web services to the clients.
E.g.: - Internet Information service (IIS).
Example for Application servers: Tom pact, Web logic, web sphere etc..,
d. Distributed environment: -
It is similar to the web environment but the number of application servers are increased and represented in individual tiers in order to distribute the business logic so that the logic will be distributed.
N-tier Architecture:
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