11/16/13

Internet, the Internet, and Intranets.

Internet is network of networks.

The public Internet (that is, the global network of networks mentioned above) is the network that one typically refers to as the Internet.

There are also many private networks, such as many corporate and government networks, whose hosts cannot exchange messages with hosts outside of the private network (unless the messages pass through so-called firewalls, which restrict the flow of messages to and from the network). These private networks are often referred to as intranets, as they use the same type of hosts, routers, links and protocols as the public Internet.

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