2.Concepts and Virtualized Network Functions(VNFs) Architecture VNF VNF VNF VNF >Network Functions Virtualization (NFV) envisages the implementation of NFs as NFV Infrastructure(NFVI) software-only entities that NFV Management run over the NFV and Infrastructure (NFVD). Virtual Virtual Virtual Orchestration computing storage network Virtualization Layer The Figure on the right illustrates the high-level NFV framework.As such, three main working Computing Storage Transport hardware hardware hardware domains are identified in NFV: Figure 7.7 High-Level NFV Framework 2020/5/21 Dr.Zhangi xu,National Key Lab on ISN,Xidian University 7