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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Link Control Protocol
   LCP
      <protocol> A protocol used to automatically agree upon
      encapsulation format options, handle varying packet size
      limits, authenticate the identity of its peer on the link,
      determine when a link is functioning properly and when it is
      defunct, detect a looped-back link and other common
      misconfiguration errors, and terminate the link.
      [RFC 1570].
      (1997-05-10)