PPP(PointtoPointProtocol)数据链路层协议。两种认证方式：一种是PAP，一种是CHAP。相对来说PAP的认证方式安全性没有CHAP高。PAP在传输password是明文的，而CHAP在传输过程中不传输密码，PAP认证是通过两次握手实现的，而CHAP则是通过3次握手实现的。一、实验配置拓扑图图一二、PPP的基本配置命令Router(config-if)#encapsulationPPPRouter(config-if)#PPPmultilinkRouter(config-if)#PPPauthenticationchap三、配置PPP图二路由器Boson上配置PPP的命令图三Newyork上配置PPP的命令图四启用RIP路由协议，两个路由器要配置RIPBoson路由器的配置：Boston#shrunning-configBuildingconfiguration...Currentconfiguration:652bytes!version12.4noservicepassword-encryption!hostnameBoston!!!!!usernameNewyorkpassword0senya!ipsshversion1noipdomain-lookup!!interfaceFastEthernet0/0noipaddressduplexautospeedautoshutdown!interfaceFastEthernet0/1ipaddress192.168.1.1255.255.255.0duplexautospeedauto!interfaceSerial0/3/0descriptionLinktoRouterNewyorkipaddress192.168.2.1255.255.255.0encapsulationppppppauthenticationchapclockrate56000!interfaceVlan1noipaddressshutdown!routerripversion2network192.168.1.0network192.168.2.0!ipclassless!!!!!linecon0linevty04login!!endNewyork路由器的配置：Newyork#shrunning-configBuildingconfiguration...Currentconfiguration:606bytes!version12.4noservicepassword-encryption!hostnameNewyork!!!!!usernameBostonpassword0senya!ipsshversion1!!interfaceFastEthernet0/0noipaddressduplexautospeedautoshutdown!interfaceFastEthernet0/1ipaddress192.168.3.1255.255.255.0duplexautospeedauto!interfaceSerial0/3/0descriptionlinktoBostonipaddress192.168.2.2255.255.255.0encapsulationppppppauthenticationchap!interfaceVlan1noipaddressshutdown!routerripversion2network192.168.2.0network192.168.3.0!ipclassless!!!!!linecon0linevty04login!!end图五配置计算机的IP地址及网关图六在计算机PC0上使用ping命令检查网络的连通性图表SEQ图表\*ARABIC1