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<object><abstract>   Digital Twin technology has seen rapid adoption in Industry 4.0.  The
   application of Digital Twin technology in the networking field is
   meant to develop various rich network applications, realize efficient
   and cost-effective data-driven network management, and accelerate
   network innovation.

   This document presents an overview of the concepts of Network Digital
   Twin, provides the basic definitions and a reference architecture,
   lists a set of application scenarios, and discusses such technology's
   benefits and key challenges.
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