conf t
no ip domain-lookup
line con 0
password cisco
logging synchronous
login
line vty 0 15
password cisco
logging synchronous
login
end



Router 1 -
conf t
no ip domain-lookup
line con 0
password cisco
logging synchronous
login
line vty 0 15
password cisco
logging synchronous
login
end
conf t
int f0/0
ip address 192.168.1.1 255.255.255.0
no sh
int s0/0
ip address 192.168.12.1 255.255.255.252
clock rate 128000
no sh
int s0/1
ip address 192.168.13.1 255.255.255.252
no sh
end


Router 2 -
conf t
no ip domain-lookup
line con 0
password cisco
logging synchronous
login
line vty 0 15
password cisco
logging synchronous
login
end
conf t
int f0/0
ip address 192.168.2.1 255.255.255.0
no sh
int s0/0
ip address 192.168.12.2 255.255.255.252
no sh
int s0/1
ip address 192.168.23.1 255.255.255.252
clock rate 128000
no sh
end

Router 3 -
conf t
no ip domain-lookup
line con 0
password cisco
logging synchronous
login
line vty 0 15
password cisco
logging synchronous
login
end
conf t
int f0/0
ip address 192.168.3.1 255.255.255.0
no sh
int s0/1
ip address 192.168.13.2 255.255.255.252
no sh
int s0/0
ip address 192.168.23.2 255.255.255.252
clock rate 128000
no sh
end