多项选择题
A.电路交换 B.报文交换 C.路由器交换 D.分组交换
A.100.100.100.0 B.191.100.254.254 C.172.168.2.200 D.192.168.100.2
A.68.128.45.76 B.132.68.98.154 C.192.168.0.1 D.222.232.4.1