Difference between web application testing & Client-server testing ?

First plz note the major difference between client server & web based applications is the architecture difference between client server & web based applications. Client server is a two-tier architecture and web based applications are normally 3-tier architecture.

Client server applications are straight forward and they are predictable and the transactions are limited in number. Where as web based applications are un predictable and more number of transactions than client server.

In client server applications the main categories that come into picture are Software, hardware, LAN, etc..
In web based applications, Software, hardware, Routers, Firewalls etc..