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Differences between HDLC and PPP are

  • (1) HDLC is Cisco proprietary while PPP is an open standard.
  • (2) HDLC does not provide authentication while PPP provides authentication like PAP and CHAP.
  • (3) HDLC does not support compression while PPP support compression.
  • (4) HDLC supports synchronous networks only while PPP supports both synchronous and asynchronous networks.
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