Computer Networking

Computer networking is the engineering discipline concerned with the communication between computer system or devices. A computer network is any set of computers or devices connected to each other with the ability to exchange data. Computer networking is sometimes considered a sub-discipline of telecommunication, computer science, information technology since it relies heavily upon the theoretical and practical application of these scientific and engineering disciplines. The three types of networks are: the Internet, the intranet, and the extranet. Examples of different network methods are: Local Area Network (LAN), Metropolitan area network(MAN),wide area network(WAN),Wireless LAN(WLAN).

All networks are interconnected to allow communication with a variety of different kinds of media, including twisted-pairs copper wire cable, coaxial cable, optical fiber ,power lines and various wireless technologies. The devices can be separated by a few meters (e.g. via Bluetooth) or nearly unlimited distances (e.g. via the interconnections of the Internet). Networking, routers, routing protocal, and networking over the public Internet have their specifications defined in documents called RFCs.