R1
enable
conf t
hostname R1
int fa0/0
ip address 192.168.1.2 255.255.255.0
no sh
int fa0/1
ip address 12.0.0.1 255.0.0.0
no sh
int fa1/0
ip address 14.0.0.1 255.0.0.0
no sh
R2
enable
conf t
hostname R2
int fa0/0
ip address 12.0.0.2 255.0.0.0
no sh
int fa0/1
ip address 23.0.0.2 255.0.0.0
no sh
R3
enable
conf t
hostname R3
int fa0/0
ip address 23.0.0.3 255.0.0.0
no sh
int fa0/1
ip address 34.0.0.3 255.0.0.0
no sh
int fa1/0
ip address 192.168.2.2 255.255.255.0
no sh
R4
enable
conf t
hostname R4
int fa0/0
ip address 14.0.0.4 255.0.0.0
no sh