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1. Introduction Connected: An Internet Encyclopedia
1. Introduction

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1. Introduction

1. Introduction

PPP has three main components:

  1. A method for encapsulating datagrams over serial links.

  2. A Link Control Protocol (LCP) for establishing, configuring, and testing the data-link connection.

  3. A family of Network Control Protocols (NCPs) for establishing and configuring different network-layer protocols.

In order to establish communications over a point-to-point link, each end of the PPP link must first send LCP packets to configure the data link during Link Establishment phase. After the link has been established, PPP provides for an optional Authentication phase before proceeding to the Network-Layer Protocol phase.

By default, authentication is not mandatory. If authentication of the link is desired, an implementation MUST specify the Authentication-Protocol Configuration Option during Link Establishment phase.

These authentication protocols are intended for use primarily by hosts and routers that connect to a PPP network server via switched circuits or dial-up lines, but might be applied to dedicated links as well. The server can use the identification of the connecting host or router in the selection of options for network layer negotiations.

This document defines the PPP authentication protocols. The Link Establishment and Authentication phases, and the Authentication- Protocol Configuration Option, are defined in The Point-to-Point Protocol (PPP) [1].


Next: 1.1. Specification Requirements

Connected: An Internet Encyclopedia
1. Introduction

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