Router(config)# username DesertVW password class
Router(config)# interface serial 0
Router(config-if)# encapsulation ppp
Router(config-if)# ppp authentication chap
Router(config-if)# exit
Router(config)# interface serial 1
Router(config-if)# encapsulation ppp
Router(config-if)# ^Z
Router# copy run start
PPP works well on the WAN by providing authentication and security to our network. We can use CHAP to keep security at its best. PPP does a great job of maintaining connections and is considered to be much more reliable and secure than other Layer 2 protocols.