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1、14051082_06F9_c3©1999,CiscoSystems,Inc.1ExtranetArchitectureSession140514051082_06F9_c3©1999,CiscoSystems,Inc.2Copyright©1998,CiscoSystems,Inc.Allrightsreserved.PrintedinUSA.1082_06F9_c3.scr1Agenda•WhatIsanExtranet?•WhyUseanExtranet?•TypesofExtranets•CaseStud
2、y•Conclusions14051082_06F9_c3©1999,CiscoSystems,Inc.3WhatIsanExtranet?Bilateral•Asemi-publicintranet•Asemi-privateInternetOverlayInternet•AprivatenetworkthatconnectsindependentpeerorganizationsShared14051082_06F9_c3©1999,CiscoSystems,Inc.4Copyright©1998,Cisco
3、Systems,Inc.Allrightsreserved.PrintedinUSA.1082_06F9_c3.scr2WhyUseanExtranet?•Businessmodel(policy)Policy•ControlSecurityQualityofService•Costs$$$14051082_06F9_c3©1999,CiscoSystems,Inc.5WhoConnectstoExtranets?•Suppliers•Partners•Customers•Co-petitors14051082_
4、06F9_c3©1999,CiscoSystems,Inc.6Copyright©1998,CiscoSystems,Inc.Allrightsreserved.PrintedinUSA.1082_06F9_c3.scr3TypesofExtranets•Bilateral•OverlayInternet•Shared14051082_06F9_c3©1999,CiscoSystems,Inc.7Bilateral14051082_06F9_c3©1999,CiscoSystems,Inc.8Copyright©
5、1998,CiscoSystems,Inc.Allrightsreserved.PrintedinUSA.1082_06F9_c3.scr4Extranet—Bilateral•Privatecircuitstosuppliers,partners,andcustomers•Example:Cisco14051082_06F9_c3©1999,CiscoSystems,Inc.9Extranets—CiscoSystemsPartners/Extranet(1999)14051082_06F9_c3©1999,C
6、iscoSystems,Inc.10Copyright©1998,CiscoSystems,Inc.Allrightsreserved.PrintedinUSA.1082_06F9_c3.scr5Extranet—BilateralDMZFirewallInternetCorporateIntranetFirewallDMZPartner#1Partner#214051082_06F9_c3©1999,CiscoSystems,Inc.11Bilateral—PhysicalConnectionPartner#1
7、CorporateIntranet•SinglelinetoapartnerLeasedlineOthertransportservice•UsuallynotthroughtheInternet14051082_06F9_c3©1999,CiscoSystems,Inc.12Copyright©1998,CiscoSystems,Inc.Allrightsreserved.PrintedinUSA.1082_06F9_c3.scr6Bilateral—Addressing•RegisteredIPaddress
8、espreferableAddressauthorityassignedGloballyunique•Privateaddresses—RFC1918RequirescoordinationMustbelocallyunique14051082_06F9_c3©1999,CiscoSystems,Inc.13PrivateAddressing(1)10.0.0.0131.
