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PPP originated as an encapsulation protocol for transporting IP traffic over point-to-point links
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supports IP, DECnet, IPX, AppleTalk, Mac layer bridging;
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operates over dialup or leased lines;
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allows to assign IP address automatically (dynamically);
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PPP established asynchronous (start-stop) and synchronous (bit-oriented) encapsulation, link quality testing, error detection, link configuration
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PPP components
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Link Control Protocol - establish, configure, and test data-link connection
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Network Control Protocols - establish and configure different network-layer protocols
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High-Level data Link Control (HDLC) - a method for encapsulating datagrams over point-to-point links
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