
80 Chapter 3 • Using PPP To Provide Remote Network Access
completed by the configuration request responses mentioned in the pre-
vious list of LCP acknowledgements.
LCP authenticates point-to-point peers by using either PAP or CHAP.
Which authentication protocol that LCP uses is configurable by the user.
MS-CHAP is an authentication protocol proprietary to Microsoft that is also
supported by Cisco. These three authentication protocols will be discussed
later in this chapter.
Figure 3.2 LCP negotiation of MRU and authentication values.
Once LCP has established the data-link layer for the connection, the
responsibility for setting up the network layer is ...