onsisting of software and hardware components that can provide the environment for the VNFs to build up and evolve is required. The various field of application are content delivery networks CDN, Fixed access networks, Mobile core and IMS, Mobile base station home environment and platform such as NFVIaaS, NFVPaaS, NFVSaaS. On this NFVI, VNFs are deployed thus providing the ecosystem for multiple use cases and fields of application simultaneously. NFVI domain can be categorized as follows: NFV Compute Domain: Includes the functional elements such as processors, accelerators, network interfaces and storage. It also identifies the interfaces between the compute domain and other elements of the NFVI as well as other external interface, which are supported by NFV. NFV Hypervisor Domain: A hypervisor is a virtual machine monitor that allows virtual machines, called hosts to be deployed. Hypervisors allocate resources to these hosts. NFV Hypervisor Domain primarily focuses on the use of hypervisors as an implementation technology. NFV Infrastructure Network Domain: This domain identifies the external interfaces of the domain as well as the functional blocks within the domain. The functional blocks include virtual networks, network resources, other virtualization layer options, control and administrative agents. It also includes interfaces to the other NFVI domains, and other features of the networking domain that impact the aspects of NFV. Virtual Network Functions Virtual Network Functions are software implementations of network functions previously implemented as proprietary hardware appliances, which now can be deployed on the network functions virtualization infrastructure. The concept of VNF component (VNFC) has been developed as a general approach to virtualizing Downloaded 4/15/2022 9:44:49 AM Nova Southeastern University IP Address: 137.52.76.29 Introduction to SDN and NFV Figure 7. High level ETSI NFV framework Virtualized Network Functions (VNFs) VNF #2 VNF #1 VNF #3 (NAT) (RTR) NFV Management and Orchestratio