! interface Serial0/0 ip address 172.16.2.2 255.255.255.252 ! end R2 ! hostname R2 ! interface Ethernet0/0 ip address 192.168.4.2 255.255.255.0 ! interface Serial0/0 ip address 172.16.2.1 255.255.255.252 clockrate 64000 ! ip classless ! end R3 ! hostname R3 ! interface Ethernet0/0 ip address 192.168.4.1 255.255.255.0 half-duplex ! interface Serial0/0 ip address 192.168.1.1 255.255.255.0 no fair-queue ! end R4 ! hostname R4 ! interface Ethernet0/0 ip address 192.168.100.1 255.255.255.0 ! interface Serial0/0 ip address 192.168.2.1 255.255.255.0 clockrate 64000 no fair-queue ! interface Serial0/1 ip address 192.168.1.2 255.255.255.0 clockrate 64000 ! ip http server ip classless ! end R5 ! hostname R5 ! interface Loopback0 ip address 10.1.1.1 255.255.255.0 no ip directed-broadcast ! interface Ethernet0/0 ip address 172.16.1.2 255.255.255.0 no ip directed-broadcast ! interface Serial0/0 ip address 192.168.2.2 255.255.255.252 ! ip classless end Cấu hình ban đầu cho các router : R1 Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#hostname R1 R1(config)#line console 0 R1(config-line)#password cisco R1(config-line)#login R1(config)#line vty 0 4 R1(config-line)#password cisco R1(config-line)#login R1(config-line)#exit R1(config)#enable password cisco R1(config)#interface s0/0 R1(config-if)#ip address 172.16.2.2 255.255.255.252 R1(config-if)#clock rate 64000 R1(config-if)#no shutdown R1(config-if)#int e0/0 R1(config-if)#ip address 172.16.1.1 255.255.255.0 R1(config-if)#no shutdown R1(config-if)#exit R1(config)# cấu hình cho router R2 : Router>enable Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#hostname R2 R2(config)#line console 0 R2(config-line)#password cisco R2(config-line)#line vty 0 4 R2(config-line)#no login R2(config-line)#exit R2(config)#interface e0/0 R2(config-if)#ip address 192.168.4.2 255.255.255.0 R2(config-if)#no shutdown R2(config-if)#interface s0/0 R2(config-if)#ip address 172.16.2.1 255.255.255.252 R2(config-if)#clock rate 64000 R2(config-if)#no shutdown R2(config-if)#exit R2(config)#^Z R2# cấu hình cho router R3 : Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#hostname R3 R3(config)#line console 0 R3(config-line)#password cisco R3(config-line)#line vty 0 4 R3(config-line)#no login R3(config-line)#exit R3(config)#interface s0/0 R3(config-if)#ip address 192.168.1.1 255.255.255.0 R3(config-if)#clock rate 64000 R3(config-if)#no shutdown R3(config-if)#interface e0/0 R3(config-if)#ip address 192.168.4.1 255.255.255.0 R3(config-if)#no shutdown R3(config-if)#exit R3(config)#^Z R3# cấu hình cho router R4 : Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#hostname R4 R4(config)#line console 0 R4(config-line)#password cisco R4(config-line)#line vty 0 4 R4(config-line)#no login R4(config-line)#exit R4(config)#interface s0/1 R4(config-if)#ip address 192.168.1.2 255.255.255.0 R4(config-if)#clock rate 64000 R4(config-if)#no shutdown R4(config-if)#interface s0/0 R4(config-if)#ip address 192.168.2.1 255.255.255.252 R4(config-if)#clock rate 64000 R4(config-if)#no shutdown R4(config-if)#exit cấu hình cho router R5 : Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#hostname R5 R5(config)#line console 0 R5(config-line)#password cisco R5(config-line)#line vty 0 4 R5(config-line)#no login R5(config-line)#exit R5(config)#interface s0/0 R5(config-if)#ip address 192.168.2.2 255.255.255.252 R5(config-if)#clock rate 64000 R5(config-if)#no shutdown R5(config-if)#interface e0/0 R5(config-if)#ip address 172.16.1.2 255.255.255.0 R5(config-if)#no shutdown R5(config-if)#interface loopback 0 R5(config-if)#ip address 10.1.1.1 255.255.255.0 R5(config-if)#^Z R5# kiểm tra bảng định tuyến : R1#show ip route Gateway of last resort is not set 172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks C 172.16.1.0/24 is directly connected, Ethernet0/0 C 172.16.2.0/30 is directly connected, Serial0/0 R2#show ip route Gateway of last resort is not set 172.16.0.0/30 is subnetted, 1 subnets C 172.16.2.0 is directly connected, Serial0/0 C 192.168.4.0/24 is directly connected, Ethernet0/0 R3#show ip route Gateway of last resort is not set C 192.168.4.0/24 is directly connected, Ethernet0/0 C 192.168.1.0/24 is directly connected, Serial0/0 R4#show ip route Gateway of last resort is not set C 192.168.1.0/24 is directly connected, Serial0/1 192.168.2.0/30 is subnetted, 1 subnets C 192.168.2.0/30 is directly connected, Serial0/0 R5#show ip route Gateway of last resort is not set 172.16.0.0/24 is subnetted, 1 subnets C 172.16.1.0 is directly connected, Ethernet0/0 10.0.0.0/24 is subnetted, 1 subnets C 10.1.1.0 is directly connected, Loopback0 192.168.2.0/30 is subnetted, 1 subnets C 192.168.2.0 is directly connected, Serial0/0 . R3(config-line)#password cisco R3(config-line)#line vty 0 4 R3(config-line)#no login R3(config-line)#exit R3(config)#interface s0/0 R3(config-if)#ip address 192.168.1.1 255.255.255.0 R3(config-if)#clock. line. End with CNTL/Z. Router(config)#hostname R2 R2(config)#line console 0 R2(config-line)#password cisco R2(config-line)#line vty 0 4 R2(config-line)#no login R2(config-line)#exit R2(config)#interface. R3(config-if)#clock rate 64000 R3(config-if)#no shutdown R3(config-if)#interface e0/0 R3(config-if)#ip address 192.168.4.1 255.255.255.0 R3(config-if)#no shutdown R3(config-if)#exit R3(config)#^Z R3# cấu