One difference between PPP and HDLC is that PPP supports authentication from
PAP (password authentication protocol) and CHAP (Challenge Handshake
Authentication Protocol). I believe that PPP runs over ISDN and HDLC
doesn't (but don't quote me on that one, I'm not sure).
-P
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=10766&t=10737
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