1.1 Remote Access
1.1.6 PPP encapsulation
PPP is an international standard encapsulation used for the following types of connections:
  • Asynchronous serial
  • ISDN
  • Synchronous serial

Because it is standardized, PPP supports vendor interoperability. PPP uses its Network Control Program (NCP) component to encapsulate multiple protocols, as shown in the Figure. The use of NCPs overcome the limitations of SLIP, the predecessor of PPP, which sets up transport only for IP packets.

PPP uses another of its major components, the Link Control Protocol (LCP), to negotiate and set up control options on the WAN data link. Some of the PPP LCP features covered in this course provide:

  • Authentication
  • Compression
  • Multilink