© 2005 Cisco Systems, Inc. All rights reserved.INTRO v Module Summary LANs are networks that are located in a limited area, with their components (computers, interconnections, and network devices) located relatively close together. Ethernet is the most common type of LAN, and it has its own unique characteristics. There are standards that specify cabling and signaling for Ethernet LANs at both the physical and data link layers of the OSI model. Bits that are transmitted over an Ethernet LAN are organized into frames. Ethernet LANs manage the signals on a network by a process called CSMA/CD. There are several connection components in an Ethernet LAN, including NICs; connection media such as RJ-45 connectors, jacks, and GBICs; and shielded or unshielded twisted-pair cable. There are guidelines for choosing what type of cable and connections to use.

© 2005 Cisco Systems, Inc. All rights reserved.INTRO v2.12-2