(My Study)......................Computer Network (1).............English Version

Introduction
The merging of computers and communications has had a profound influence on the way computer systems are organized.

The concept of the ''computer center'' as a room with a large computer to which users bring their work for processing is now totally obsolete (used out of date).
The old model of a single computer serving all of the organization's computational needs has been replaced by one in which a large number of separate but interconnected computers do the job. These systems are called computer networks.
Two computers are said to be interconnected if they are able to exchange information. The connection need not be via a copper wire; fiber optics, microwaves, infrared, and communication satellites can also be used. Networks come in many sizes, shapes and forms, as we will see later. Although it may sound strange to some people, neither the Internet nor the World Wide Web is a computer network. By the end of this book, it should be clear why. The quick answer is: the Internet is not a single network but a network of networks and the Web is a distributed system that runs on top of the Internet.