Understanding Virtualized Network Functions

AC.

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In a Network Function Virtualization (NFV) reference architecture, virtualized network functions (VNFs) are the key building blocks of the NFV environment. VNFs are software implementations of network functions that traditionally run on dedicated hardware appliances.

Here are the two statements that are true about virtualized network functions:

B. One VNF can be deployed over multiple VMs, where each VM hosts a single component of the VNF.

This statement is true because VNFs can be modularized into individual components, where each component can run in a separate virtual machine (VM). This allows for greater flexibility in deploying VNFs, as different components of the VNF can be scaled independently, based on the network demands. For example, if a VNF consists of multiple components such as a firewall, load balancer, and NAT, each component can be deployed on a separate VM, and the number of VMs can be scaled up or down based on the network traffic.

C. VNF functionally includes control and management of the compute, storage, and network resources in the NFV framework.

This statement is also true because VNFs are responsible for managing the underlying compute, storage, and network resources that are used by the NFV infrastructure. This includes tasks such as resource allocation, load balancing, and fault management. VNFs interact with the NFV infrastructure through standardized interfaces, such as the NFV Orchestrator (NFVO), to manage the underlying resources.

To summarize, VNFs are software implementations of network functions that can be modularized and deployed over multiple VMs. VNFs are also responsible for managing the underlying compute, storage, and network resources in the NFV framework.