请在下列路由器命令的右边括号内写上该行命令的意义: enable (进入特权用户配置模式) config ( ) Router1_config# interface fastethernet 0/0 ( ) Router1_config_f0/0# ip address 192.168.10.222 255.255.255.0 ( ) Router1_config_f0/0# exit Router1_config# interface ethernet 0/1 ( ) Router1_config_e0/1# ip address 192.168.20.222 255.255.255.0 ( ) Router1_config_e0/1# exit Router1_config# router rip ( ) Router1_config# network 192.168.10.0 ( ) Router1_config# network 192.168.20.0 ( )