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CHAPTER 5 OTHER LAN TECHOLOGIES Large Ethernet networks including Hierarchical switch organization to reduce cost Single points of failure Workgroup versus core switches Virtual local area networks and Ethernet physical layer standards Wireless LANs Including 80211 speeds 80211 access points and hand-offs CSMACA ACK Bluetooth masterslave operation Spread spectrum transmissions box features ATM LANs Including Quality of service QoS guarantees for voice and video but not necessarily for data ATM preparation using meshes and virtual circuits to reduces switching costs Comparisons between ATM and Ethernet in handling brief traffic peaks Legacy LANs Including token -ring networks and early Ethernet standards LARGER ETHERNET NETWORKS In a hierarchy There is only on possible path between any two station EthernetRequires hierarchical arrangement for its switches LOW-COST SWITCHINGAdvantage Ethernet switches only have to do simple table lookups when a frame arrives Simple table lookups are very fast Making Ethernet switches very inexpensive for the traffic load they handle Note routers have to do more work because there are alternative routes between any two stations Must identify all possible routes Then select the best route WORKGROP VERSUS CORE SWITCHES Workgroup switchesConnect stations directly to switches Carry traffic to and from their stations previous chapter Dominant port speed 10100Mbps Core switches Are switches farther up the hierarchy They carry traffic between one switch and another They must work faster than workgroup switches Have to handle traffic of many workgroup switches Emerging dominant port speed 1Gbps 10Gbps VIRTUAL LANs AND ETHERNET SWITCHES UnicastingEthernet NICs normally wish to unicast Send a from a from one station to one other station Broadcast Send message to all stations Novel Netware servers may advertise there presence every 60 seconds for so by broadcasting a server advertisement message that is designed to go to all to the stations The station that wishes to broadcast sets the frames destination MAC
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