Ender204426777乾颐堂CCNAv3.0课程BuildingaMedium-SizedNetworkIntroducingWANTechnologies介绍广域网技术乾颐堂CCNAv3.0Ender204426777IntroducingWANsWhatisaWAN?EnderH-48乾颐堂CCNAv3.0Ender204426777IntroducingWANs(Cont.)WhyareWANsneeded?Ender49乾颐堂CCNAv3.0Ender204426777WANsvs.LANsWAN=AcollectionofLANs广域网是局域网的集合WANsLANsAreaWidegeographicareaSinglebuildingorsmallgeographicareaOwnershipSubscriptiontooutsideserviceproviderOwnedbyorganizationCostRecurringFixedEnder50乾颐堂CCNAv3.0Ender204426777WANsvs.LANs(Cont.)Ender51乾颐堂CCNAv3.0Ender204426777RoleofRoutersinWANsWANsvs.LANs路由器用于转发处于不同VLAN间的流量Ender52乾颐堂CCNAv3.0Ender204426777WANCommunicationLinkOptionsEnder53广域网链路的类型选择：专有网络交换网络互联网乾颐堂CCNAv3.0Ender204426777Point-to-PointConnectivityEthernetemulation:•Simple简单•Affordable承载力更强•Flexible灵活的Ender54乾颐堂CCNAv3.0Ender204426777ConfiguringaPoint-to-PointLink点到点的连接Branch(config)#interfaceGigabitEthernet0/1Branch(config-if)#ipaddress192.168.1.1255.255.255.252Branch(config-if)#descriptionWANLinktoHQBranch(config-if)#noshutdownConfiguringtheBranchrouterwithanIPaddressandinterfacedescription•Usepingtoverifyend-to-endconnectivityEnder55乾颐堂CCNAv3.0Ender204426777Summary•AWANallowsthetransmissionofdataacrossbroadgeographicdistances.•AWANisacollectionofLANs,androutersplayacentralroleintransmittingdatathroughWANs.•TherearethreeWANcommunicationlinkoptions:dedicatedcommunicationlinks,switchedcommunicationlinks,andpublicconnections.•AcommontypeofWANconnectivityisthepoint-to-pointconnectionthatemulatesEthernet.•ConfiguringaninterfaceforemulatedEthernetWANconnectivityconsistsofsettingtheIPaddressandenablingtheinterface.Ender56乾颐堂CCNAv3.0Ender204426777Ender57
