what is the difference between three tier and two tier application?
– Client server is a 2-tier application. In this, front end or client is connected to ‘Data base server’ through ‘Data Source Name’,front end is the monitoring level. Web based architecture is a 3-tier application. In this, browser is connected to web server through TCP/IP and web server is connected to Data base server,browser is the monitoring level. In general, Black box testers are concentrating on monitoring level of any type of application. All the client server applications are 2 tier architectures. Here in these architecture, all the “Business Logic” is stored in clients and “Data” is stored in Servers. So if user request anything, business logic will b performed at client, and the data is retrieved from Server(DB Server). Here the problem is, if any business logic changes, then we need to change the logic at each any every client. The best ex: is take a super market, i have branches in the city. At each branch i have clients, so business logic is stored in clients, but the act
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