The Internet: How It Works And How It Affects The World

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called IP (Internet Protocol), which enabled traffic to be routed from one net to another as needed. All the networks connected by IP in the Internet speak IP, so they can all exchange messages." (Levine 12)
Even though there were only two networks at that time, IP was made to allow thousands of networks. The IP is designed so that every computer on an IP network is compatible. That means any machine can communicate with any other machine.
The Internet, also called the Net, is the world's largest computer network. The Internet is the "network of all networks." (Levine 7) The networks are connected to big companies like AT&T, as well as to home computers. About 1,000 networks join each month.
Every computer that is attached to the Internet is called a host. Hosts can be super computers with thousands of users, regular PC's with only a couple of users, or specialized computers, like routers that connect networks together or to terminal servers that let terminals dial in ...

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To figure out the binary number in the example into its Hex equivalent is in this way: 1011 is the first four digits of the binary number. Looking at the table, it can be determined that its hexadecimal equivalent is a "B". The second set of four binary numbers is 0100. That changes into 4 and so on.

The first four numbers of a host number tells you what class the network is. The chart bellow states classes and sizes:

Class First Number Length of first Number Maximum Number of Hosts

A 1-126 1 16,387,064
B 128-191 2 64,516
C 192-223 3 254

Big companies like IBM and Apple usually have class A ...

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