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NE40E V800R010C00 Feature Description - WAN Access 01

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Introduction of PPP

Introduction of PPP

Definition

The Point-to-Point Protocol (PPP) is a link-layer protocol used to transmit point-to-point (P2P) data over full-duplex synchronous and asynchronous links.

PPP negotiation involves the following items:

  • Data encapsulation mode: defines how to encapsulate multi-protocol data packets.

  • Link Control Protocol (LCP): used to set up, monitor, and tear down data links.

  • Network Control Protocol (NCP): used to negotiate options for a network layer protocol running atop PPP and the format and type of the data to be transmitted over data links.

PPP uses the Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP) to secure network communication.

If carriers have high bandwidth requirements, bundle multiple PPP links into an MP link to increase link bandwidth and improve link reliability.

Purpose

PPP, which works at the second layer (data link layer) of the open systems interconnection (OSI) model, is mainly used on links that support full-duplex to transmit data. PPP is widely used because it provides user authentication, supports synchronous and asynchronous communication, and is easy to extend.

PPP is developed based on the Serial Line Internet Protocol (SLIP) and overcomes the shortcomings of SLIP which supports transmits only IP packets, and does not support negotiation. Compared with other link-layer protocols, PPP has the following advantages:
  • PPP supports both synchronous and asynchronous links, whereas SLIP supports only asynchronous links, and other link-layer protocols, such as X.25, support only synchronous links.
  • PPP is highly extensible.
  • PPP uses a Link Control Protocol (LCP) to negotiate link-layer parameters.
  • PPP uses a Network Control Protocol (NCP), such as the IP Control Protocol (IPCP) or Internetwork Packet Exchange Control Protocol (IPXCP), to negotiate network-layer parameters.

  • PPP supports Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP) which improve network security.
  • PPP does not have a retransmission mechanism, which reduces network costs and speeds up packet transmission.
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Updated: 2018-07-04

Document ID: EDOC1100027168

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