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这是我们的网络上机作业.有关IOS配置的

router>enable
 &nbsp;<br>&nbsp; router#config&nbsp;t
 &nbsp;<br>&nbsp; router(config)#&nbsp;hostname&nbsp;&nbsp;&nbsp;r1
 &nbsp;<br>&nbsp; r1(config)#interface&nbsp;s0
 &nbsp;<br>&nbsp; r1(config-if)#&nbsp;ip&nbsp;address&nbsp;202.1.1.1&nbsp;&nbsp;255.255.255.0
 &nbsp;<br>&nbsp; r1(config-if)#&nbsp;no&nbsp;shutdown
 &nbsp;<br>&nbsp; r1(config-if)#&nbsp;exit
 &nbsp;<br>&nbsp; r1(config)#&nbsp;interface&nbsp;s1
 &nbsp;<br>&nbsp; r1(config-if)#&nbsp;ip&nbsp;address&nbsp;201.1.1.1&nbsp;255.255.255.0
 &nbsp;<br>&nbsp; r1(config-if)#no&nbsp;shutdown
 &nbsp;<br>&nbsp; r1(config-if)#exit
 &nbsp;<br>&nbsp; r1(config)#ip&nbsp;routing
 &nbsp;<br>&nbsp; r1(config)#ip&nbsp;route&nbsp;203.1.1.0&nbsp;255.255.255.0&nbsp;202.1.1.2
 &nbsp;<br>&nbsp; r1(config)#exit
 &nbsp;<br>&nbsp; 
 &nbsp;<br>&nbsp; 
 &nbsp;<br>&nbsp; 
 &nbsp;<br>&nbsp; router&gt;enable
 &nbsp;<br>&nbsp; router#config&nbsp;terminal
 &nbsp;<br>&nbsp; r1(config)#hostname&nbsp;r4
 &nbsp;<br>&nbsp; r4(config)#interface&nbsp;s0
 &nbsp;<br>&nbsp; r4(config-if)#ip&nbsp;address&nbsp;202.1.1.2&nbsp;255.255.255.0
 &nbsp;<br>&nbsp; r4(config-if)#no&nbsp;shutdown
 &nbsp;<br>&nbsp; r4(config-if)#exit
 &nbsp;<br>&nbsp; r4(config)#interface&nbsp;e0
 &nbsp;<br>&nbsp; r4(config-if)#ip&nbsp;address&nbsp;203.1.1.1&nbsp;255.255.255.0
 &nbsp;<br>&nbsp; r4(config-if)#no&nbsp;shutdown
 &nbsp;<br>&nbsp; r4(config-if)#exit
 &nbsp;<br>&nbsp; r4(config)#ip&nbsp;routing
 &nbsp;<br>&nbsp; r4(config)#ip&nbsp;route&nbsp;201.1.1.0&nbsp;255.255.255.0&nbsp;202.1.1.1
 &nbsp;<br>&nbsp; r4(config)#exit
 &nbsp;<br>&nbsp; r4#ping&nbsp;201.1.1.1
 &nbsp;<br>&nbsp;