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What is a computer network? In simple terms, a computer network is a group of connected computers that allow the sharing of information and equipment. The most ordinary network is made up of two computers connected by some kind of cable in order to exchange information more quickly and efficiently. A standalone computer is very useful to many businesses, but without a network, those businesses would have to spend twice the amount of money then they would have to by having a network. A network allows many computers and peripheral devices such as printers and facsimile machines to be connected to each other. The two primary benefits of computer networking are sharing devices and data sharing.

 

There are two basic types of networks: peer-to-peer and server-based. On a peer-to-peer network, any computer can act as a server to share resources with other machines and as a client to access resources from other machines. On the other hand, server-based networks require a server computer whose job is to respond to requests for services or resources from clients elsewhere on the network. Server-based networks are used in many and most organizations today.

 

Before all this is said and done, a network layout in other words the topology of the network must be determined. The term topology not only refers to the physical layout but how the computers, cables and other resources communicate with each other. There are three basic types of topologies: bus, ring, and star. A bus topology consists of computers connected along a single cable segment. This cable segment is referred to as a backbone. A bus topology is the most common method for connecting computers. However there is one major drawback, a single cable break can terminate the whole network. This goes for the ring topology method as well. The ring topology networks are constructed when a cable, forming a circle connects all the computers to each other. The ring topology uses something called token passing. This is a method of sending data within the ring. When a computer sends a file for example, it travels through the ring until it reaches its destination point. Each computer is given an equal chance to send data; therefore none of the computers can occupy the network. But as everything else has a flaw, so does a ring topology network. The entire network will fail if one computer in the ring fails, unless it is in a dual-ring network, where the network can operate around a failure.

 
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