R1(config)#ip route 192.168.8.0 255.255.255.0 192.168.7.2
R2(config)#router RIP
R2(config-router)#network 192.168.2.0
R2(config-router)#network 192.168.3.0
R2(config-router)#network 192.168.7.0
R2(config-router)#end
R1(config)#ip route 192.168.1.0 255.255.255.0 FastEthernet 0/0
R4(config)#router RIP
R4(config-router)#network 192.168.5.0
R4(config-router)#network 192.168.6.0
R4(config-router)#network 192.168.7.0
R4(config-router)#network 192.168.8.0
R4(config-router)#end
R4(config)#ip route 192.168.1.0 255.255.255.0 192.168.7.1
R3(config)#router RIP
R3(config-router)#network 192.168.3.0
R3(config-router)#network 192.168.4.0
R3(config-router)#network 192.168.5.0
R3(config-router)#end