Chapter 2. TYPES OF NETWORK CONNECTIONS
Every computer connected to a network must follow a set of rules and specifications that define the characteristics of both the physical connection and the form and structure of the data that moves from one computer to another. Without these rules, the people using the network cannot be sure that their computers will communicate successfully.
For example, the plugs at the ends of data cables must match the sockets on each computer and other network hardware. If a cable uses a square plug with two pins, but the computer has a round socket with four holes, they won't fit together. The same thing applies to the electrical voltages, timing, error checking, and other issues. There are many different kinds of networks, ...
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