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.
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