Computer networking, also known as data communications (datacom) is the practice of linking together two or more computer systems or devices for the purpose of exchanging data. Computer networking is considered a sub-discipline of telecommunications, computer science, information technology and/or computer engineering because it is greatly dependent on the theoretical and practical application of the previously mentioned disciplines.

There are three types of networks. These are the internet, intranet and the extranet. The internet is a global system of interconnected networks of computers. These networks uses Internet Protocol Suite, either TCP or IP, to be able to serve billions of computer users all over the world. The intranet, on the other hand, is a private computer network. Although the intranet uses Internet Protocol technologies, that information are secured within the organization. The extranet is an extension of

a company’s intranet. This is a computer network which allows access to the organizations intranet from the outside. Usually used for business and educational purposes, the extranet allows users from outside the company to access certain information and data. The extranet is especially helpful to vendors, partner, and suppliers.

There are different methods of networking computers. One method is called LAN or local area network. This is a small network of computers contained within a small geographical