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A network administrator needs to configure a serial link between the main office and a remote location.The router at the remote
A network administrator needs to configure a serial link between the main office and a remote location.The router at the remote
admin
2019-04-08
38
问题
A network administrator needs to configure a serial link between the main office and a remote location.The router at the remote office is a non-cisco router. How should the network administrator configure the serial interface of the main office router to make the connection?
选项
A、 Main(config)#interface serial 0/0
Main(config-if)#ip address 172.16.1.1 255.255.255.252
Main(config-if)#no shut
B、Main(config)#interface serial 0/0
Main(config-if)#ip address 172.16.1.1 255.255.255.252
Main(config-if)#encapsulation ietf
Main(config-if)#no shut
C、Main(config)#interface serial 0/0
Main(config-if)#ip address 172.16.1.1 255.255.255.252
Main(config-if)#encapsulation frame-relay
Main(config-if)#authenication chap
Main(config-if)#no shut
D、Main(config)#interface serial 0/0
Main(config-if)#ip address 172.16.1.1 255.255.255.252
Main(config-if)#encapsulation ppp
Main(config-if)#no shut
答案
D
解析
remote office 使用非思科路由器,则main office 是思科路由器。
HDLC是Cisco路由器在同步串行线路上的默认封装方式。每个厂商的HDLC都是专用的。
PPP 用于异步串行(拨号)或同步串行(isdn)介质。PPP的基本目标是在数据链路层点到点链路上传输第3层包。它不是一个专用协议,这就意味着如果你的路由器并不都是Cisco的,可以在串行接口上配置PPP封装。串行接口两端的路由器都配置PPP才能工作。
帧中继有两种封装类型——Cisco和IETF.除非手动输入IETF,否则默认封装是Cisco。如果用帧中继连接一条Cisco设备和一条非Cisco设备,要选择IETF封装类型。命令格式如下
Router(config)#int s0/0/0
Router(config-if)#encapsulation ?
frame-relay Frame Relay networks
hdlc Serial HDLC synchronous
ppp Point-to-Point protocol
Router(config-if)#encapsulation frame-relay ?
ietf Use RFC1490/RFC2427 encapsulation
由此判断选项B 和C,命令格式不正确。
如果当一台思科路由器和一台非思科路由器通过串行连接在一起时,必须配置PPP或另外一种封装方法,像帧中继,因为默认的HDLC不能工作。
转载请注明原文地址:https://www.kaotiyun.com/show/OihZ777K
本试题收录于:
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