PPP Overview, History and Benefits
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PPP General Function and Architecture
PPP is a connection-oriented protocol that enables layer two links over a variety of different physical layer connections. It is supported on both synchronous and asynchronous lines, and can operate in half-duplex or full-duplex mode. It was designed to carry IP traffic but is general enough to allow any type of network layer datagram to be sent over a PPP connection. As its name implies, it is for point-to-point connections between exactly two devices, and assumes that frames are sent and received in the same order.
PPP fits into the Network Interface layer (Link Layer) in the TCP/IP model, as shown in Figure 23. The operation of PPP follows a specific sequence described in the general operation topic, including a multi-step link establishment phase that may include optional authentication.
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