Implement High-Level Data Link Control (HDLC) and PPP

HDLC (High-Level Data Link Control) HDLC is a layer 2 protocol used for WAN connectivity. HDLC uses keepalives to monitor connectivity with the remote end device. The DCE side of the connection sends the DTE side a keepalive packet containing a sequence number. The DTE side echos this sequence number back to the DCE proving …

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