第10章 点到点连接.ppt

WAN Overview WANs connect remote sites. Connection requirements vary depending on user requirements, cost, and availability. WAN Connection Types Typical WAN Encapsulation Protocols: Layer 2 HDLC Frame Format Configuring HDLC Encapsulation PPP 概述 PPP 可以通过 NCP 携带多个协议的数据包 PPP 可以通过 LCP 建立和控制连接 PPP 验证概述 两种 PPP 验证协议: PAP 和 CHAP PPP验证 在PPP会话中，验证是可选的。 如果需要验证，则须通信双方的路由器要交换彼此的验证信息。 可以选择PAP或CHAP；在一般情况下，CHAP是首选协议。 PAP协议-Password Authentication Protocol 密码明文传输 验证两端是同等的 PAP、CHAP-Challenge Handshake Authentication Protocol PAP：密码在链路上是明文传输的；连接建立后，需要不停地在链路上反复发送用户名和密码。 CHAP：中心路由器进行三次询问，不允许连接方发起验证尝试连接。 CHAP例子 hostname r1 username r2 password cisco int serial0 Ip add 10.1.1.1 255.255.255.0 encapsulation ppp ppp authentication CHAP 厦门微思网络培训中心 厦门微思网络培训中心 第十章 点到点连接 DDN ATM ,FR ,X.25 PSTN,ISDN Serial Point-to-Point Connections Supports only single-protocol environments Uses a proprietary data field to supportmultiprotocol environments Router(config-if)#encapsulation hdlc Enables HDLC encapsulation Uses the default encapsulation on synchronous serial interfaces PPP Encapsulation TCP/IP Novell IPX AppleTalk Multiple protocol encapsulations using NCPs in PPP Link setup and control using LCP in PPP PPP 会话的建立1 链路建立 2 验证阶段（可选） 3 网路层协议连接 Dialup or Circuit-Switched Network r1 r2 Hostname: r2 Password: cisco Username: r1 Password: cisco PAP 2-Way Handshake “r1, cisco” Accept/Reject hostname r2 username r1 password cisco int serial0 Ip add 10.1.1.2 255.255.255.0 encapsulation ppp ppp authentication CHAP R2 R1 DDN Purpose: This chapter introduces the Cisco IOS? CLI on the Catalyst? 1900 switch and router. Timing: This chapter should take about 2 hours to present. Note: The Catalyst 1900 switch only has a subset of the router Cisco IOS commands available. Contents: Introduction to Cisco IOS. Explain to the student what is IOS? Cisco Device startup procedures in general. IOS configuration source. General introduction to the IOS CLI. Cat 1900 switch startup procedures. Intro to Cat 19