Computer Networks


LANs

Local Area Networks - connect hardware devices that are in close physical proximity

Ethernet - most commonly used model.

A local-area network (LAN) protocol developed by Xerox Corporation in cooperation with DEC and Intel in 1976. Ethernet uses a bus or star topology and supports data transfer rates of 10 Mbps. The Ethernet specification served as the basis for the IEEE 802.3 standard, which specifies the physical and lower software layers. Ethernet uses the CSMA/CD access method to handle simultaneous demands. It is one of the most widely implemented LAN standards.

A newer version of Ethernet, called 100Base-T (or Fast Ethernet), supports data transfer rates of 100 Mbps. And the newest version, Gigabit Ethernet supports data rates of 1 gigabit (1,000 megabits) per second. (From webopedia).

There are two approaches to Ethernet (10Mbps) LANs:

Communication protocols  give rules for message transmission between network nodes, regardless of implementation approach.

Only nodes with the same protocols can communicate directly.


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Last Updated 03/22/2000
© L.Heath, 2000