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 for virtual circuit
From The Free On-line Dictionary of Computing (30 December 2018) :

  virtual circuit
  switched virtual circuit
      A connection-oriented network service which
     is implemented on top of a network which may be either
     connectionless+({packet+switching">connection-oriented or connectionless ({packet switching).
     The term "switched virtual circuit" was coined needlessly to
     distinguish an ordinary virtual circuit from a permanent
     virtual circuit.  (One of the perpetrators of this confusion
     appears to be ["Networking Essentials", 1996, Microsoft Press,
     ISBN 1-55615-806-8], a book aimed at people preparing for the
     MCSE exam on LANs and WANs).
     Not to be confused with switched virtual connection.

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