Ender204426777乾颐堂CCNAv3.0课程EnablingInternetConnectivityEnablingInternetConnectivity乾颐堂CCNAv3.0Ender204426777TheDemarcationPoint分界点Ender乾颐堂CCNAv3.0Ender204426777DynamicHostConfigurationProtocolUnderstandingDHCP:•DHCPisaclient-servermodel.C-S模型去分发IP地址和配置•ADHCPserverallocatesnetworkaddressesanddeliversconfigurations.•ADHCPclientisahostthatrequestsanIPaddressandconfigurationfromaDHCPserver.Ender-144乾颐堂CCNAv3.0Ender204426777DynamicHostConfigurationProtocol(Cont.)DHCPIPaddressallocationmechanisms:•Automaticallocation:ApermanentIPaddressisassignedtoaclient.自动分配地址即永久的分配地址给客户端•Dynamicallocation:AclientisassignedanIPaddressforalimitedtime.动态分配地址即有限时间内给客户端分配地址•Manualallocation:AclientisassignedanIPaddressbythenetworkadministrator.Ender-145乾颐堂CCNAv3.0Ender204426777OptionsforConfiguringaProviderAssignedIPAddress-SP给企业级用户分配的方案OptionsforconfiguringIPaddresses:•Staticallyassigned-静态分配地址•DynamicallyassignedthroughDHCP-通过DHCP动态分配地址Ender-146乾颐堂CCNAv3.0Ender204426777ConfiguringaStaticProvider-AssignedIPAddressRouter(config)#interfaceGigabitEthernet0/0Router(config-if)#ipaddress209.165.200.225255.255.255.224Router(config-if)#noshutdownRouter(config)#iproute0.0.0.00.0.0.0209.165.200.226•ConfiguresapublicIPaddress•Createsadefaultroutethatpointstowardthenext-hopIPaddressEnder-147乾颐堂CCNAv3.0Ender204426777ConfiguringaDHCPClientRouter(config)#interfaceGigabitEthernet0/0Router(config-if)#ipaddressdhcp•RouterautomaticallyinjectsdefaultroutebasedonoptionaldefaultgatewayparameterreceivedwithassignedIPaddress.CPE自动的通过默认网关的参数注入一条默认路由Ender-148乾颐堂CCNAv3.0Ender204426777Publicvs.PrivateIPv4AddressesClassPrivateAddressRangeA10.0.0.0to10.255.255.255B172.16.0.0to172.31.255.255C192.168.0.0to192.168.255.255ClassPublicAddressRangeA1.0.0.0to9.255.255.25511.0.0.0to126.255.255.255B128.0.0.0to172.15.255.255172.32.0.0to191.255.255.255C192.0.0.0to192.167.255.255192.169.0.0to223.25...
