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Chapter 6:

Computer network: is a system that connects computers and other devices via communications media so that data and information can be transmitted among them. It is used for computers to work together, be interdependent, and exchange data with each other.

A local area network (LAN): connects two or more devices in a limited geographical region so that every device on the network can communicate with every other device. Connects Pc’s in one building.

A wide area network (WAN): is not restricted to a geographical location, although it might be confined within the bounds of a state or country. A WAN connects several LANs, and may be limited to an enterprise (a corporation or an organization) or accessible to the public. It interconnects LAN’s.

Analog technologies: information is translated into electric pulses of varying amplitude (waves). Digital technologies translation of information is into binary format (zero or one) where each bit is representative of two distinct amplitudes.

Communication and media channels:

Twisted pair cable: most prevalent, used almost all business telephone wiring. Copper wires, inexpensive. Slow for transmitting data, subject to interference and easily tapped.
Coaxial Cable: insulated copper wires. Less susceptible to electrical interference than twisted and can carry more much data. (TV uses it) more expensive and inflexible
Fiber Optics: thousand of filaments of glass fibers that transmit information via light pulses. Surrounded by cladding. More data and security.

Transmission Technologies:

Digital Subscriber Line (DSL): a high-speed, digital data transmission technology using existing analog telephone lines.

Network Protocol:

Ethernet: A common LAN protocol

A protocol is the set of rules and procedures governing transmission across a network. It establishes how devices are going to

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