(第2空)在路由器R2上采用命令( )得到如下所示结果。
R2>
...
R 192.168.1.0/24 [120/1] via 212.107.112.1，00:00:11，Serial2/0
C 192.168.2.0/24 is directly connected, FastEthernet0/0
212.107.112.0/30 is subnetted, 1 subnets
C 212.107.112.0 is directly connected, Serial2/0
R2>
其中标志“R”表明这条路由是( )。