Digital twin network (DTN) provides a virtual representation of a physical network and may support network applications including security drill [ITU-T Y.3090]. With profound and full-scale understanding of historical, real-time and static network related data, DTN is able to be used as a test bed where various network situations could be sensed; security risk or security devices could be simulated; different security strategies could be generated, tested, optimized and decided. Some network security applications, such as security forecast, security operation, security device manufacture and so on, could be provided in a better and more intelligent way when supported by DTN. DTN has the capability to bring features like verifiability, real-time, crossing-time, visualization to network security applications. This recommendation specifies requirements and use-cases of DTN to support security related network applications for unified and standardized interoperability and to guide stakeholders to construct, operate, maintain and use digital twin-based network security capabilities.

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