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TCP/IP Serial Line Internet Protocol (SLIP) and Point-to-Point Protocol (PPP)
The TCP/IP protocol suite is structured
around the Internet
Protocol (IP). IP operates at layer three
of the OSI
Reference Model, and assumes that it will
be layered on top of an existing layer two technology. However, certain
types of connections exist that do not include a layer two protocol
over which IP can run. To enable TCP/IP to operate on these kinds of
links, two special TCP/IP data link layer protocols have been created.
In this section I describe the protocols
used specifically to implement data link layer connectivity for TCP/IP
internetworks. I begin with a brief overview of the two protocols used
to connect devices at layer two and how they fit into the TCP/IP
protocol suite as a whole. I then have
a single topic that describes the operation of the rather simple Serial
Line Internet Protocol (SLIP), and a comprehensive section on the much
more capable Point-to-Point Protocol (PPP).
 Background Information: I want to emphasize again that IP is really the foundation of the TCP/IP protocol suite, even though SLIP and PPP are at a lower architectural layer. For this reason, I strongly recommend at least a basic understanding of the Internet Protocol before proceeding with this section. If you are going to read about both IP and SLIP/PPP, I recommend reading about IP first.
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