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welcome to this free CCNA packet tracer practice lab you can download the lab file from the link in the description if you like these labs please consider supporting me via my patreon or the cryptocurrency options in the description also please subscribe to the channel for more labs like this in this lab we will take a look at the point-to-point protocol PPP PPP is a layer 2 protocol often used over serial LAN or wide area network connections on a Cisco router the default layer 2 encapsulation on a serial connection is Cisco hdl-c however PPP provides superior security through authentication functionality so in this lab we will configure PPP with two different authentication methods on the connection between r1 and SPR one meaning service provider router 1 we will configure PPP with PAP the password authentication protocol which uses a static password to authenticate the connection on the connection between r2 and SPR 2 we will configure PPP with chap the challenge handshake authentica