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PPP Overview, History and Benefits
(Page 2 of 3)
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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