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CCNA Quick Reference Sheets (CCNA Exam 640-802) by Jim Doherty, Eric Rivard

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Chapter 3. Understanding Ethernet

Ethernet was developed in the 1970s by Digital Equipment Corporation (DEC), Intel, and Xerox. Later, the IEEE defined new standards for Ethernet called Ethernet 802.3. The 802.3 standard is the standard that is in use today.

Definition of a LAN

Local-area networks (LAN) are high-speed, low-error data networks that cover a small geographic area.

LANs are usually located in a building or campus and do not cover a large distance. They are relatively inexpensive to develop and maintain. LANs connect computers, printer, terminals, and other devices in a single building or a limited area.

LANs consist of the following components:

  • Computers: Examples include PCs and servers.

  • Interconnections: Provide a means for data to travel. ...

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