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PersonalcomputerLANs
Lowcost
Limiteddatarate
Backendnetworks
Interconnectinglargesystems(mainframesandlargestoragedevices)
Highdatarate
Highspeedinterface
Distributedaccess
Limiteddistance
Limitednumberofdevices
2
LANApplications(2)
StorageAreaNetworks
Separatenetworkhandlingstorageneeds
Detachesstoragetasksfromspecificservers
Sharedstoragefacilityacrosshigh-speednetwork
Harddisks,tapelibraries,CDarrays
Improvedclient-serverstorageaccess
Directstoragetostoragecommunicationforbackup
Highspeedofficenetworks
Desktopimageprocessing
Highcapacitylocalstorage
BackboneLANs
InterconnectlowspeedlocalLANs
Reliability
Capacity
Cost
3
StorageAreaNetworks
4
个人计算机局域网
客户/服务器计算模式
后端网络和存储区域网
大型系统互联:大型机、海量存储
特征:高速高可靠性、有限数量和距离
高速办公室网络
大信息量数据处理
骨干局域网
高带宽、高可靠性
实现速率相对较低的LAN的互联
局域网应用
5
KeyelementsofaLANare
Topologies
Transmissionmedium
Layout
Mediumaccesscontrol
8
Tree
Bus
Specialcaseoftree
Onetrunk,nobranches
Ring
Star
9
StarTopology
Eachstationconnecteddirectlytocentralnode
Usuallyviatwopointtopointlinks
Centralnodecanbroadcast
Physicalstar,logicalbus
Onlyonestationcantransmitatatime
Centralnodecanactasframeswitch
15
Reliability
Expandability
Performance
Needsconsideringincontextof:
Medium
Wiringlayout
Accesscontrol
16
BusLAN TransmissionMedia(1)
Twistedpair
EarlyLANsusedvoicegradecable
Didn’tscaleforfastLANs
NotusedinbusLANsnow
Basebandcoaxialcable
Usesdigitalsignalling
OriginalEthernet
17