怎样理解ShowIProute命令
You are a network administrator at Pcjob. You are troubleshooting a router problem. You issue the show ip route command on one of the routers. The output from the command is shown in the following exhibit:What does represent?
A. 120 is the bandwidth allocation and 3 is the routing process number.
B. 120 is the administrative distance and 3 is the metric for that route.
C. 120 is the value of the update timer and 3 is the number of updates received.
D. 120 is the UDP port for forwarding traffic and 3 is the number of bridges.
作为Pcjob的收集打点员，你正在为路由器排错，你在其中的一台路由器使用show ip route呼吁，输出的结不美观如上，描述的是什么意思？
正确谜底：B
诠释：
路由器的IOS使用一个名为Administrative Distance(打点距离)的概念来抉择使用哪一个路由。Admininstrative distance暗示的是一个零丁路由器中所有路由和谈的可托度的这样一个数值，数质ё俳低越好，也就是说，数质ё俳低，路由和谈可托度越高。
Route Type Administrative Distance
? Connected 0
? IGRP 100
? RIP 120
参考资料：
CCNA Self-Study CCNA ICND exam certification Guide (Cisco press, ISBN 1-58720-083-X) Page 177
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