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In a Network Function Virtualization reference architecture. Which two statements about virtualized network functions are true? (Choose two)
A. VNF performs the orchestration and lifecycle management of the software resources that supports the virtualized infrastructure.
B. VNF is a virtualization of a legacy network function
C. VNF functionality includes control and management of the compute, storage, and network resources in the NFV framework
D. VNF is the totality of all hardware and software components that build up the NFV environment.
E. One VNF can be deployed over multiple VMs. Where each VM hosts a single component of the VNF.
Correct Answer: BE
Explanation/Reference:
https://en.wikipedia.org/wiki/Network function virtualization#References function virtualization#References The NFV framework consists of three main components:[8]
1.Virtualized network functions (VNFs) are software implementations of network functions that can be deployed on a network functions virtualization infrastructure (NFVI).
2.Network functions virtualization infrastructure (NFVI) is the totality of all hardware and software components that build the environment where VNFs are deployed. The NFV infrastructure can span several locations. The network providing connectivity between these locations is considered as part of the NFV infrastructure.
3.Network functions virtualization management and orchestration architectural framework (NFV- MANO Architectural Framework) is the collection of all functional blocks, data repositories used by these blocks, and reference points and interfaces through which these functional blocks exchange information for the purpose of managing and orchestrating NFVI and VNFs.
A virtual network function (VNF) is a virtualized task formerly carried out by proprietary, dedicated hardware.
VNF moves network functions out of dedicated hardware devices and into software. This allows specific functions that required hardware devices in the past to operate on standard x86 servers. VNFs carry out specific network functions on virtual machines (VMs) under control of a hypervisor. Such tasks might include firewalling, domain name service (DNS), caching or network address translation (NAT). in an NFV environment, a virtual network function (or VNF) takes on the responsibility of handling specific network functions that run on one or more virtual machines (VMs) on top of the hardware networking infrastructure — routers, switches, etc. Individual virtual network functions can be connected or combined together as building blocks to offer a full-scale networking communication service.
BE