E-LearningenvironmentnetworkWiththerapiddevelopmentofnetworktechnology,especiallydigitalcampusandtheconstructionofeducationalinformationneedsofthecampusnetworkhavebecomeincreasinglydemanding.Intermsofspeed,campusnetworkbackbonespeedincreasefromthefirst100Mbpsto10,000Mbps(10Gbps).Intheagreement,frompasttoupgradetotheIPv4IPv6.Inthesegmenthasalsobeenaqualitativebreakthrough:fromtheearlydevelopmentofthesharedmediumlocalareanetworktothecurrentswitchedLAN.SwitchedLANtechnologyenablesbandwidthofdedicatedusersasopposedtogreatlyimprovetheefficiencyoflocalareanetworktransmission.Inaddition,suchasthebroadbandintelligentnetwork,intelligentopticalnetworking,opticalfibercommunicationnetworkandsoftswitchtechnology,newnetworktechnologiesareemerging.Weregiventhefollowingset1Multi-layerswitchingtechnologyparknetworknetwork.Convergencelayergenerallyfarawayfromthenetworkcenter,theneedfordozensofbuildingsafewblocksoraccessswitchconvergence,foraregionalnetworking.Accesslayergenerallylocatedwithinabuilding,orthefloorforGailoucomputerterminalnetwork.Asthemorecomplexthestructureofthecampusnetwork,themanagementbemorenumberofcomputers,inordertobettermanagethenetwork,improvenetworkefficiency,thelayeredswitchingtechnologyinvolved.Amongthem,thethirdlayerswitchingtechnologyisoperationalinthethirdlayernetworkprotocolisaroutingdeviceandcanbeplayedtounderstandtheroleoftheroutingdecision;fast,almosttothesecondtierexchangerate.Here,wediscussanexampleofaparkshouldbeconsideredinnetworkdesignandnetworkswitchingelements.Thecurrentnetworkarchitecturewithlayeredstructureare:corelayer,convergencelayerandaccesslayer.Fromthenetworkprotocollevelcanbedividedintothefirstlayer,secondlayer,thirdlayer....Thestructureofthenetworksystem,thecorelayerinthenetworkengineroom,responsibleforthemanagementoftheentirecampusnetwork.Convergencelayergenerallyfarawayfromthenetworkcenter,theneedfordozensofbuildingsafewblocksoraccessswitchconvergence,foraregionalnetworking.Accesslayergenerallylocatedwithinabuilding,orthefloorforGailoucomputerterminalnetwork.Asthemorecomplexthestructureofthecampusnetwork,themanagementbemorenumberofcomputers,inordertobettermanagethenetwork,improvenetworkefficiency,thelayeredswitchingtechnologyinvolved.Amongthem,thethirdlayerswitchingtechnologyisoperationalinthethirdlayernetworkprotocolisaroutingdeviceandcanbeplayedtounderstandtheroleoftheroutingdecision;fast,almosttothesecondtierexchangerate.1.1FlatBridgeNetworkThefirstparkisconsideredthesingleLANinthenumberofnewusersaddedtotheformation.ThisLANisanetworkdeviceconnectedthroughthephysicalorlogicallineswithanetwork.Insuchanetwork,allnetworkdevicestosharethe10Mbpshalf-duplexEthernetbandwidthavailable.Atthistime,thewholenetworkisaconflictdomain,becauseallnetworkdevicescanlistentothenetworktotransmitdatapacketswillhaveconflicts,andthereforetheintroductionofCSMA/CDcollisiondetectionmechanismtoplanthenetworkdatatransmission.Whenaconflictdomaindatatransferhasbecomeverycrowded,usuallyweshouldaddabridge.Bridgeisastore-forwardtypeofdatapacketswitches,whichthewholenetworkintoseveralcollisiondomains,toreducepacketcollisions,increasethetransmissionefficiency.Bridgewillnotendtheisolationnetworkbroadcast,multicast,andmulticastdata,thatis,allbridgenetworksthroughoutthecampusnetworkisasinglebroadcastdomain.Thisposesaproblemofdatacircuits,applicationoftheapplicationofSTPSpan...
