NETWORKS
A computer network is a group of computers connected to each other electronically. This means that the computers can "talk" to each other and that every computer in the network can send information to the others. Usually, this means that the speed of the connection is fast - faster than a normal connection to the Internet. Some basic types of computer networks include:
- A local area network (often called a LAN) connects two or more computers, and may be called a corporate network in an office or business setting.
- An "internetwork", sometimes called a Wide Area Network (because of the wide distance between networks) connects two or more smaller networks together. The largest internetwork is called the Internet.
Computers can be part of several different networks. Networks can also be parts of bigger networks. The local area network in a small business is usually connected to the corporate network of the larger company. Any connected machine at any level of the organization may be able to access the Internet, for example to demonstrate computers in the store, display its catalogue through a web server, or convert received orders into shipping instructions.
a communication channel is the medium that is used in the transmission of a message from one party to another; for example the print media or the broadcast media. In electronic media, channels of communications refer to the physical medium such as a wire used to convey information signals from one point to the other.
twisted pair wire
coaxial cable
fiber optic cable
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