English Version: When there is more than one computer in the world, people have struggle to connect computers together. When there is two or even more computer is connected together there is call computer network ! Not only must computer connect to another computer then only call a network ,for example a computer is connect to a printer or a camera it also can call as network ! However , some people has defined that network must include the interconnection of computers so that computer can exchange information only say it as Computer network ! There are two parts of any network that enables computers to exchange information. First, they need to be connected together by a link – this is usually a physical link such as a cable or a phone line, but it can also be a wireless link. Second, they need to have a commonly understood ‘language’ that each of them can use to unscramble the signals that each sends along the link to the other one. You can imagine thi...