DOC《试题一》

1 (1) Accept-dialin protocol l2tp virtual-template

1 terminate-from hostname a801 (2) Local name keith Lcp renegotiation always (3) No l2tp tunnel authentication ? ? 试题四 [问题1] 【答案】分三层和二层隧道隧道协议.三层有IPsec协议 二层有L2TP和PPTP协议. [问题2] 【答案】IPX、NetBEUI [问题3] 【答案】(1) 创建VPDN组1 (2)接受L2TP通道连接请求,并根据虚接口模板1创建虚拟访问,接收远程主机为a801的连接.(3)LCP再次协商. ? ? 试题五 以下是使用E1线路实现多个64Kbit/s专线连接. 当链路为T1时,channel-group编号为0~23,Timeslot范围为1~24;

当链路为E1时,channel-group编号为0~30,Timeslot范围为1~31. 路由器具体设置如下: Current configuration: ! version 11.2 no service udp-small-servers no service tcp-small-servers ! hostname router1 ! enable secret 5$1$XN08$Ttr8nfLoP9.2RgZhcBzkk/ enable password cisco ! ! ip subnet-zero ! controller E1

0 framing NO-CRC4 channel-group

0 timeslots

1 channel-group

1 timeslots

2 channel-group

2 timeslots

3 ! interface Ethernet0 ip address 133.118.40.1 255.255.0.0 media-type 10BaseT ! interface Ethernet1 no ip address shutdown ! interface Serial0:0 ip address 202.119.96.1 255.255.255.252 encapsulation hdlc no ip mroute-cache ! interface Serial0:1 ip address 202.119.96.5 255.255.255.252 encapsulation hdlc no ip mroute-cache ! interface Serial0:2 ip address 202.119.96.9 255.255.255.252 encapsulation hdlc no ip mroute-cache ! no ip classless ip route 133.210.40.0 255.255.255.0 Serial0:0 ip route 133.210.41.0 255.255.255.0 Serial0:1 ip route 133.210.42.0 255.255.255.0 Serial0:2 ! line con

0 line aux

0 line vty

0 4 password cicso login ! end [问题1]E1和CE1的主要区别是什么? [问题2]解释配置中画线部分内容含义. ? 试题五 [问题1] 【答案】CE1的传输线路的带宽是2048 Kbit/s,它和E1的区别主要在于:E1不能划分时隙,CEl能划分时隙.CE1的每个时隙是64Kbit/s,一共有32个时隙,在使用的时候,可以划分为n*64Kbit/s,例如:128 Kbit/s,256 Kbit/s等.CE1的0和15时隙是不用来传输用户的数据流量,0时隙是传送同步号,15时隙传送控制信令,这样实际能用的只有30个时隙,所以在具体配置CE1划分时隙时,需要注意.CE1和E1也可以互联,但是CE1必须当E1来使用,即不可分时隙使用.因为CE1比较灵活,所以我们能常常碰到CE1. [问题2] ? 【答案】 Current configuration: ! version 11.2 no service udp-smallservers no service tcp-smallservers ! hostname router1 ! enable secret 5$l$XN08$Ttr8nfLoP9.2RgZhcBzkk/ enable password cisco ! ! ip subnet-zero ! controller E1

0 framing NO-CRC4//帧类型为no-crc4 channel-group

0 timeslots 1//建立逻辑通道组0与时隙1的映射 channel-group

1 timeslots 2//建立逻辑通道组1与时隙2的映射 channel-group

2 timeslots 3//建立逻辑通道组2与时隙3的映射 ! interface Ethernet0 ip address 133.118.40.1 255.255.0.0 media-type 10BaseT ! interface Ethernet1 no ip address shutdown ! interface Serial0:0//逻辑接口Serial0:0 ip address 202.119.96.1 255.255.255.252 encapsulation hdlc no ip mroute-cache ! interface Serial0:1 ip address 202.119.96.5 255.255.255.252 encapsulation hdlc no ip mroute-cache ! interface Serial0:2 ip address 202.119.96.9 255.255.255.252 encapsulation hdlc no ip mroute-cache ! no ip classless ip route 133.210.40.0 255.255.255.0 Serial0:0 ip route 133.210.41.0 255.255.255.0 Serial0:1 ip route 133.210.42.0 255.255.255.0 Serial0:2 ! line con

0 line aux

0 line vty

0 4 password cicso login ! end ? ?