阅读以下说明，回答下列问题。
[说明]
某网络拓扑结构如下图所示，在host1超级终端中查石路由器R1的路由信息如下所示：
Router#show ip route
C 192.168.100.0/24 is directly connected, FastEthernet0/0
R 192.168.101.0/24 [120/1] via 192.168.112.2, 00:00:09, Serial2/0
192.168.112.0/30 is subnetted, 1 subnets
C 192.168.112.0 is directly connected, Serial2/0
查看接口信息如下所示：
Router#show interface fastethernet0/0
FastEthernet0/0 is up, line protocol is up (connected)
Hardware is Lance, address is 000a.f35e.e172 (bia 000a.f35e.e172)
Internet address is 192.168.100.1/24
MTU 1500 bytes, BW 100000Kbit, DLY 100usec, rely 255/255, load 1/255
…
该网络中采用的路由协议时（）。
