3-Tier Application Vs 2-Tier Application

2-Tier Application :-

Windows Application Architecture(WAA) is also known as 2-Tier Architecture.

It is the combination of Windows Application plus Network Programming.

It comes in 1992 and is called Client Server Technology. Server tier contains database whether it is RDBMS or DBMS and the client tier contains executable forms(.exe). Client tier access database which is stored at the server side and display on the client side. So, the disadvantage are

• Both the tier must have same operating system.
• Every client have executable forms that excess database from server tier
• Dedicated LAN protocol are used
• 2-Tier application can be extend to 3-Tier application

3-Tier Application :-

These type of architecture used in Internet application or Intranet application.

This type of architecture can be extended up-to n-Tier.

Client tier is also known as thin tier browser and the client tier only have the browser.

This architecture allow us to connect different type of devices having any type of operating system such as Desktop PC can access the database.

• There is no need to having same operating system for networking.
• Mobile browser is also known as Light browser.
• GPRS: General Purpose Radio Services.

One thing is common all the devices having at least browser. So, there is no need to put .exe files on the client side like 2-Tier.

It supports different type of protocols with different types of system. So, there is no need to having only LAN type protocol like 2-Tier. It may be HTTP or any other protocol like IEEE 802.11

Middle tier and database tier both are server tier & client may have different machine, operating system and protocol

The thing extra here is webserver. It is an extranet that actually receives the request from client and pass to middle tier and response come back to the client machine again. It treats as firewall.