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Dated: Jul. 24, 2013
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Computer network, according to their size and features they have, are classified into two main groups: A local area network is the foundation of any network . It can be simple (two computers connected by a cable), or complex (hundreds of computers and peripheral devices in a large corporation). The main characteristic of local computer networks is that it is strictly limited. Regional network (widearea Network, WAN), on the other hand, is not spatially restricted . It can connect computers and devices worldwide. Regional computer network consists of a large number of connected local area networks. The Internet is probably the best example of this type of network (although the Internet often uses the term "global network"). Previous division of computer networks for its size is very general. It is possible to finer divide them, to which the computer networks are divided into: personal networks (Personal Area Network - PAN), local area network, wireless local area network, wide area network and global networks. Personal networks connect devices of one user.
PAN network consists of a computer connected to a printer, scanner, PDA, mobile phone and so on. The distances that can be supported by such a network are very small: one meter to several meters. Local networks connect two or more computers (and other devices) in a limited geographical area. It is the most common way of organizing computer networks within a company, school or other institution. Speed of information transfer is very big (bigger than other types of networks), and the distance between the devices range from a few meters to several kilometers. Wireless local area networks, local network in which computers do not have the cables to be connected to the network. The data rates are significantly lower than the "wiring" of the local network, but they allow the user mobility. In buildings that do not allow for cable routing, "digging walls" or need quickly and with as little engagement allow users to connect to a network, wireless networks are great solution. In the client-server networks, data is stored on computers with special features - on the servers.
The task of the server is to provide services to users, using modest computing capabilities, and require a complex treatment or access to large databases. Computers that initiate communication and look for some information or processing by the server are called clients. The client-server organization allows easier management of local networks. On the server, in this case, user accounts are defined and access rules managed. Such networks are secure because customers must abide by the rules defined on the server. Server can automatically adjust clients, update anti-virus software on the client, check the content of messages that are going to or from clients, and so on. When the local network has more than a dozen computers, the introduction of the client-server simplifies network management.
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