Client Server Model

As mainframe computers more powerful and faster but costlier machines roughly a thousand times or more than a personal computer. This imbalance has caused many system engineers to build systems consisting of personal computers, one per users, with data kept on one more shared file server machines. In this model, the users are called clients and the whole arrangement is called client- server model.

In the client- server model, communication generally takes the form of a request message from the client to the server asking for some work to be done. The server then does the work and sends back the reply. Usually, there are many clients using a small number of servers.

In a typical client – server model you will find one file server a powerful processors with high speed processing capabilities and huge storage capacity hard disk. The useful single copies of softwares available on file server’s hard disk can be shared and accessed on all the nodes connected to that file server. These nodes are personal computers called clients, one per user having local processor and an optional local hard disk.

Server

A network server is usually a file server. It is a high speed computer system equipped with one or more hard disks, tapes drives and a program (networking operating system such as Novell Netwave OS) that permit network users ( client) to create, shave and store files on the disk and tapes.

Client

A client or network user is a work station PC or node connected to a common or single network server. A client PC can access and share useful softwares and files from the server’s hard disks on a request & reply basis.

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