August 1999
Intermediate to advanced
328 pages
8h 50m
English
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ROLE OF THE POINT-TO-POINT PROTOCOL (PPP)
PPP is also classified as a layer-2 protocol, but it relies on HDLC for the basic L_2 framing, error-checking, and bit-stuffing operations. It may also rest on top of LAPM or LAPB, if error correction and retransmission operations are to be used. As depicted in Figure 6-1, an Internet session may entail the execution of three L_2 protocols: (a) HDLC, (b) LAPM or LAPB, and (c) PPP.
The Point-to-Point protocol (PPP) was implemented to solve a problem that evolved in the industry during the last decade. With the rapid growth of internetworking, several vendors and standards organizations developed a number of network-layer (L_3) protocols. The Internet Protocol (IP) is the most widely used of these protocols. ...