INTERNET, THE NETWORK OF NETWORKS

Internet is a network of networks that are distributed all around the planet by cable or by satellite.

Internet has got a net topology, so the communication between two computers can be possible by different ways. If one way doesn’t works, you can try to connect by others.

The first network name was ARPANET (Advanced Research Projects Agency).

To make possible the communication between computer networks and operating systems we use the TCP/IP protocol.

We connect computers and networks by a device called modem who is the intermediary between a local area network and a telephone line.

ACCESS TO INTERNET

The ISP (Internet Service Provider) provides the access to Internet, and these are the same telephone company.

The most popular access technology is the ADSL (Asymmetric Digital Subscriber Line), which uses the telephone line by copper cable. It is an asymmetric line because the downloading speed is different than the uploading speed.