Configuring Serial Encapsulation - HDLC and PPP

Router 1
======

Router>enable
Router#configure terminal
Router(config)#hostname Router1
Router1(config)#username admin password cisco123
Router1(config)#interface serial 0/0/0
Router1(config-if)#ip address 192.168.20.1 255.255.255.252
Router1(config-if)#clock rate 56000
Router1(config-if)#encapsulation ppp
Router1(config-if)#ppp authentication chap
Router1(config-if)#no shutdown
Router1(config-if)#exit
Router1(config)#exit
Router1#copy running-config startup-config

Router 2
======

Router>enable
Router#configure terminal
Router(config)#hostname Router2
Router2(config)#username admin password cisco123
Router2(config)#interface serial 0/0/0
Router2(config-if)#ip address 192.168.20.2 255.255.255.252
Router2(config-if)#clock rate 56000
Router2(config-if)#encapsulation ppp
Router2(config-if)#ppp authentication chap
Router2(config-if)#no shutdown
Router2(config-if)#exit
Router2(config)#exit
Router2#copy running-config startup-config