configure terminal
!
hostname Router_1
!
interface FastEthernet0/0
 ip address 157.1.168.1 255.255.255.0
 no shutdown
!
interface FastEthernet0/1
 ip address 202.1.91.1 255.255.255.0
 no shutdown
!
interface Serial0/0
 encapsulation frame-relay
 ip address 157.1.151.1 255.255.255.0
 no shutdown
!
interface loopback0
 ip address 170.1.1.1 255.255.255.0
!
end
!
write memory