Data Communications Networking Devices - 4th Ed.pdf

xii _______________________________________________________________________ CONTENTSThe ATM cell header 259ATM connections and cell switching 262Review Questions 2643. Local Area Networks 2693.1 Overview 269Origin 270Comparison to WANs 270Geographic area 270Data transmission and error rates 271Ownership 271Regulation 271Data routing and topology 272Type of information carried 272Utilization bene®ts 273Peripheral sharing 273Common software access 273Electronic mail 273Gateway access to mainframes 2733.2 Technological Characteristics 274Topology 274Loop 274Bus 275Ring 275Star 275Tree 275Mixed topologies 276Comparison of topologies 276Signaling methods 277Broadband versus baseband 277Broadband signaling 277Baseband signaling 278Transmission medium 279Twisted-pair 280Coaxial cable 288Fiber optic cable 291Access method 292Listeners and talkers 292Carrier-Sense Multiple Access with Collision Detection CSMA/CD) 293Token passing 2943.3 IEEE 802 Standards 296802 committees 297Data link subdivision 298Medium Access Control 299Logical Link Control 299Physical layer subdivision 3003.4 Ethernet Networks 300Original network components 300Coaxial cable 300Transceiver and transceiver cable 301Interface board 302Repeaters 302IEEE 802.3 networks 303Network names 30310BASE-5 30310BASE-2 30510BROAD-36 306