A.10.0.0.0-10.255.255.255 B.172.16.0.0-172.31.255.255 C.192.168.0.0-192.168.255.255 D.0.0.0.1-9.255.255.255
A.IP SW B.IP routing C.SW ip D.route
A.实现在二层交换机的广播隔离 B.不能在二层交换机的广播隔离 C.划分网段 D.广播有意义