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HDLC
1.It is vendor specific.
2.It doesnt support authentication.
3.It supports synchronous network only.
4.It doesnt support multiplexing.
PPP
1.It is a standard protocol.
2.It supports authentication, like: PAP and CHAP.
3.It supports synchronous as well as asynchronous network.
4.But it supports multiplexing, like: multilinks.
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