某网络拓扑如下图所示,在主机hostl上设置默认路由的命令为(39) ,在主机hostl上增加一条到服务器s
(39)
A. route add 0.0.0.0 mask 0:0.0.0 220.110.100.1
B. add 220.110. 100.100.1 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 220.110.100.10.0:0.0 mask 0.0.0.0
(40)
A. add route 220.110.100.1 220.110.101.25 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