作业
Switch：
router rip
version 2
network 192.168.1.0
network 192.168.3.0
R1：
router rip
version 2
network 192.168.3.0
network 192.168.4.0
R2:
router rip
version 2
network 192.168.2.0
network 192.168.4.0
Switch：
router rip
version 2
network 192.168.1.0
network 192.168.3.0
R1：
router rip
version 2
network 192.168.3.0
network 192.168.4.0
R2:
router rip
version 2
network 192.168.2.0
network 192.168.4.0