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Cisco Network Service Orchestrator (NSO) version 6.2.8 is an evolution of the Tail-f Network Control System (NCS). Tail-f was acquired by Cisco in 2014. The product has been enhanced and forms the base for Cisco NSO. Note that the terms 'ncs' and 'tail-f' are used extensively in file names, command-line command names, YANG models, application programming interfaces (API), etc. Throughout this document we will use NSO to mean the product, which consists of a number of tools and executables. These executable components will be referred to by their command line name, e.g. ncs, ncs-netsim, ncs_cli, etc.