Odlomak

Introduction
The need for information was made man to make connections with various sources of information and to create networks which will itself facilitate the collection, transfer, storage and processing of data. Due to rapid development of computer technology in recent years (increase in performance with a fall in prices) and the real explosion of the Internet, the number of computers and computer networks is growing rapidly. With all the more powerful computer equipment daily to introduce new services and, at the same time in the networking set higher standards. Over time the network systems evolved and today reached the level of practical efficient environment for data exchange.
The beginnings of the networking are linked to the first telegraph and telephone lines which were passed on information to remote locations. The availability and flexibility of today’s technology of modern computer networks enabled with any point on the planet can be connected to the network and get the desired information. Compared with the former price of using this service network, exploiting the price of today’s networks is becoming lower. Computer networks are now indispensable part of business infrastructure, how large, and small organizations. Knowledge of technology and the use of networks even beyond the scope of application of the business (which can provide business advantage organizations – eg. E-commerce enables small businesses and competitiveness in the market), into the other aspects of human life by becoming part of general culture.

Computer networks can be a free set of two or more computers that are linked to adequate medium and that each can communicate and share resources. Is used to transmit both digital and analog data, which must be adapted to the respective transmission systems. Network to transmit computer data, voice, image, video, and applications on the user may be such that the required data in real time (voice, video, etc.), Or it may not be a condition (e-mail, file transfer, etc. .). The network consists of a computer, transfer medium (wire, optical fiber, air, etc.) And devices such as hubs, switches, routers and so on. which is an infrastructure network. Some devices, such as network cards, allowing connection between the computer and the network.

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