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如下图所示,在Cisco2511路由器R1的16个异步串行接口上连接一台Modem pool为用户提供拨号上网服务,分配一个IP子网地址为195.223.56.16/28;使用同步串行接口,通过DDN专线与R2相连,分配一个IP地址为222.112.41.81/30。下列路由器R1的异步串行接口a1和同步串行接口s1/1的部分配置,正确的是()。


  • A.Router (config)#interface a1 Router (config-if)#encapsulation ppp Router (config-if)#async default ip address 195.223.56.16 Router (config-if)#exit Router (config)#interface s1/1 Router (config-if)#ip address 222.112.41.81 255.255.255.252 Router (config-if)#encapsulation ppp
  • B.Router (config)#interface a1 Router (config-if)#encapsulation ppp Router (config-if)#async default ip address 195.223.56.16 Router (config-if)#exit Router (config)#interface s1/1 Router (config-if)#ip address 222.112.41.81 255.255.255.252 Router (config-if)#encapsulation hdlc
  • C.Router (config)#interface a1 Router (config-if)#encapsulation ppp Router (config-if)#async default ip address 195.223.56.17 Router (config-if)#exit Router (config)#interface s1/1 Router (config-if)#ip address 222.112.41.81 255.255.255.252 Router (config-if)#encapsulation ppp
  • D.Router (config)#interface a1 Router (config-if)#encapsulation hdlc Router (config-if)#async default ip address 195.223.56.17 Router (config-if)#exit Router (config)#interface s1/1 Router (config-if)#ip address 222.112.41.81 255.255.255.252 Router (config-if)#encapsulation ppp
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参考答案:C
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