Networking

Next we look at how the basic elements of connections, communications, and services work together to make networks function properly:

The connections must operate so that any computer can send or receive electrical signals (data) across the physical media that link them.
Communications must function so that when one computer sends a message, the receiving computer can listen and understand the message.
Computers on a network must either provide a service to other computers or make use of a service provided by other computers.