Internet comprises networks linked to each other through ways that allow an exchange of information, data and file. Being connected to the Internet means being able to access the web and also being able to make a change with one's computer any amount of data with any other system connected to the web. One can access the net through a local area network or through a computer and a modem passing by an ISP. The router is the equipment that connects two networks to each other and does all the work related to the distribution of the traffic. It analyzes the various messages, finds and locates the final destination by finding the best route to let the message or file reach in the least time, the appropriate final destination. There are different ways in which the various networks can operate. There are some dedicated lines that can transmit data with the speed of 64 KBPS (thousands of bytes per second), there is a large diffusion of the line E1 with a speed of 2 MBPS (millions of bytes per second) and the E3 that can reach a speed beyond 34 MBPS by which the various networks can operate. There are some dedicated lines that can transmit data with the speed of 64 KBPS (thousands of bytes per second), there is a large diffusion of the line E1 with a speed of 2 MBPS (millions of bytes per second) and the E3 that can reach a speed beyond 34 MBPS. The network can be connected through telephone, satellite, fibre optics cable or through the digital telephone line, ISDN (Integrated Service Digital Network).

The network of a specific geographical area is interconnected among themselves into a bigger regional network. The information collected so far will be transferred to the other world wide network through the routers. Normally, the geographical area networks are connected to each other through the superhighway backbone that allows transmission and reception of data at very high speed. When the data is transmitted from one geographical network to another, the first step will be that the data will pass through into a Network Access Point (NAP). The NAP conveys the data to the superhighway backbone at a very high speed (up to 155 MBPS). Through the backbone, the data is transferred to another regional area and finally, to the specific network, ISP and to the computer where the final data has been originally delivered. (Follow detailed drawing of the system).

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