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