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PPP Core Protocols: Link Control, Network Control and Authentication
The PPP protocol suite consists of
several dozen protocols that cover various aspects of its operation.
Of these, a few protocols can be considered the most important or “core”
of the suite. It's not that the others are not important,
mind you. But this small group is responsible for the basic operation
of PPP. In particular, they work together to implement the relatively
complex link negotiation process, which is a big part of what PPP is
all about.
In this section I describe the protocols
that are responsible for PPP link setup and basic operation. I begin
with a description of the key Link Control Protocol (LCP). I then describe
the different Network Control Protocols (NCPs) used to configure PPP
for different layer three protocols. Finally, I discuss the two PPP
authentication protocols, PAP and CHAP, used to provide authentication
during link setup.
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Quick navigation to subsections and regular topics in this section
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Version 3.0 - Version Date: September 20, 2005
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Related Information: The frame formats for these protocols are detailed in the separate