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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