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          Local Area Networks ,[object Object]
LANs started out as narrow-range systems, but the enterprise network of today has evolved into a network of interconnected LANs.
By definition, a LAN is a network dedicated to a single organization, limited in range, and connected by a common communication technology. ,[object Object]
 A restricted range.
 share a common transmission        medium.
 A network operating system (NOS),[object Object]
 Monitors the busy/idle status of the network.
Buffers/device to the speed of the network
Transmitted data stream into frames for transmission
On the network
Errors and collisions,[object Object]
 Access method
 Modulation method
 Transmission medium,[object Object]
            Access Methods LAN access methods: contention or noncontention. CSMA/CD
       Modulation Methods  In the first,  baseband,  other method, broadband, ,[object Object],[object Object]
 coaxial
cable
 fiber optics
 radio, and infrared,[object Object]

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