Point to Point Protocol(PPP) operates at the lower three layers of the OSI model.
Layer One PPP- Syncronus and asyncronus physical media
Layer Two PPP- LCP
Layer Three PPP- NCP
Point to Point Protocol
The major types of Wan links that are supported by PPP are...syncronus and asyncronus serial connections as well as ISDN.
The function of the PPP Network Control Protocol(NCP) is...to encapsulate multiple protocols.
The function of the PPP Link Control Protocol(LCP) is...to establish, maintain, and terminate the point-to-point connection.
PPP PAP and CHAP are...Authentication Protocols.
The functions of PAP in a PPP implementation are...to allow a node to establish its identity with a simple two-way handshake and to send a login and password request. If a reply to the request is not received then the connection is terminated.
The functions of CHAP in PPP implementation are...to establish a connection through a 3-way handshake and then send a challenge for a password. The methods of challenging and repeated requests that are not used in PAP make CHAP a much safer protocol.
Since PPP is the most widely used WAN protocol, it will work fine with our Network design. The processes PPP perform will allow our data to flow reliabilly and combined with CHAP, we have one heck of a protocol.
