what is the difference between hdlc and ppp protocol

Answer Posted / shafi sache

HDLC(High-level Data Link Protocal)

1)HDlC is Data Link Layer Protocl and it is a Communication
Protocal .
2)HDLC is Cisco prperitry prtocal and Devloped by ISO and
it is delovped out of IBM'S SDLC(Synchronous Data Link
Protocol)
3)HDLC is superset of SDLC.
4)It supports only Synchronous comunication.
5)It has 3 transfer modes of Normal Response mode
(NRM),Asynchronous Response Mode(ARM),Asynchronous
Balanced Mode(ABM).

PPP(Point To Point Protocol)
1)It is used for direct Comunication between 2 nodes,it has
no transfer mode like HDLC.
2)PPP is type of HLDC .
3)It supportd encryption,authentication and Comparision.
4)Authenticaion Support by PAP (password authenticaion
protocol) and also by CHAP(Challange Handshake Protocal).
5)It is not a Cisco Proprietary.

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