---

R1


enable
configure terminal
hostname R1
no ip domain-lookup
enable secret class
service password-encryption
line console 0
 password cisco
 login
exit
line vty 0 4
 password cisco
 login
exit
banner motd #Unauthorized access prohibited!#
interface g0/0
 description LAN_to_S1
 ip address 192.168.10.1 255.255.255.0
 no shutdown
exit
interface g0/1
 description LAN_to_PC-B
 ip address 192.168.20.1 255.255.255.0
 no shutdown
exit
end
write




S1


enable
configure terminal
hostname S1
no ip domain-lookup
enable secret class
service password-encryption
line console 0
 password cisco
 login
exit
line vty 0 4
 password cisco
 login
exit
banner motd #Unauthorized access prohibited!#
interface vlan 1
 ip address 192.168.10.2 255.255.255.0
 no shutdown
exit
ip default-gateway 192.168.10.1
interface fa0/1
 description PC-A
exit
interface g0/1
 description To_R1
exit
end
write