Leased-Line WANs with PPP
Point-to-Point Protocol (PPP) plays the same role as HDLC: a data link protocol for use on serial links. However, HDLC was created for a world without routers. In contrast, PPP, defined in the 1990s, was designed with routers, TCP/IP, and other network layer protocols in mind, with many more advanced features.
This second major section of this chapter first discusses PPP concepts, including one example of a more advanced PPP feature (authentication). This section ends with some configuration examples using PPP.
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