Point to point protocol ppp
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For example, there are specialized NCPs for IP (IPCP), IPX (IPXCP), AppleTalk (ATCP), and others.
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Network Control Protocol frames are used to negotiate and configure the Network layer protocols that can be used over a PPP session. The three main types of LCP frames used on a PPP connection are link-establishment, link-maintenance, and link-termination PPP options such as authentication, compression, and multilink are all configured by LCP. The Link Control Protocol is used for establishing, testing, configuring, and terminating PPP connections. This standardization helps to ensure that PPP implementations by different vendors can communicate properly. In the case of PPP, the OSI standard version is used rather than the Cisco proprietary version. HDLC is the data framing method used over PPP links. The three protocols used by PPP at the Data Link layer are HDLC, the Link Control Protocol (LCP), and various implementations of the Network Control Protocol (NCP). The ways in which the various PPP protocols and standards map to the OSI model is shown in the figure below.įigure: Point-to-Point Protocol (PPP) protocols and standards as they relate to the OSI model. It can also run over a variety of different physical layer standards, although EIA/TIA-232 (formerly RS-232) is the most commonly used. PPP is comprised of multiple protocols at the Data Link Layer, each with different areas of responsibility.
#Point to point protocol ppp serial#
Finally, PPP provides the ability to combine multiple synchronous and asynchronous serial links such that they work as a single logical connection, a technique referred to as PPP Multilink. PPP also supports a variety of data compression techniques including Stacker, Predictor, and Microsoft Point-to-Point Compression (MPPC).
#Point to point protocol ppp password#
Both the Password Authentication Protocol (PAP) and the Challenge Handshake Authentication Protocol (CHAP) can be used for authentication on a Cisco router. First and foremost, PPP supports authentication, which can be used to confirm the identity of equipment or users at either end of a point-to-point connection. PPP offers a wide variety of configurable options that make it a robust choice for encapsulating data over leased lines. One of the main disadvantages of SLIP is that it only supports point-to-point connections that use IP at the Network layer. It has largely replaced an earlier standard known as the Serial Link Internet Protocol (SLIP). PPP is an IETF-standard protocol capable of encapsulating a variety of upper-layer protocols including IP, IPX, and AppleTalk to name but a few. As such, PPP works over both synchronous and asynchronous serial interfaces. While it can be used to encapsulate data over dedicated leased lines, PPP is also commonly used for dial-up connections to corporate networks and the Internet. The Point-to-Point Protocol is another Data Link layer protocol, and one that you may already be familiar with.