某网络拓扑如下图所示,在主机host1上设置默认路由的命令为 (1) ;在主机host1上增加一条到服务器server1主机路由的命令为 (2) 。
(1)A、route add 0.0.0.0 mask 0.0.0.0 220.110.100.1
B、route add 220.110.100.1 0.0.0.0 mask 0.0.0.0
C、add route 0.0.0.0 mask 0.0.0.0 220.110.100.1
D、add route 220.110.100.1 0.0.0.0 mask 0.0.0.0
(2)A、add route 220.110.100.1 220.110.100.25 mask 255.255.255.0
B、route add 220.110.101.25 mask 255.255.255.0 220.110.100.1
C、route add 220.110.101.25 mask 255.255.255.255 220.110.100.1
D、add route 220.110.100.1 220.110.101.25 mask 255.255.255.255