若路由器的路由信息如下,则最后一行路由信息怎样得到的()。
R3#show ip route
Gateway of last resort is not set
192.168.0.0/24 is subnetted, 6 subnets
C 192.168.1.0 is directly connected, Ethernet0
C 192.168.65.0 is directly connected, Serial0
C 192.168.67.0 is directly connected, Serial1
R 192.168.69.0 [120/1] via 192.168.67.2, 00:00:15, Serial1
[120/1] via 192.168.65.2, 00:00:24, Serial0
R 192.168.69.0 [120/1] via 192.168.67.2, 00:00:15, Serial1
R 192.168.69.0 [120/1] via 192.168.652, 00:00:24, Serial0
A.串行口直接连接的
B.由路由协议发现的
C.操作员手工配置的
D.以太网端口直连的