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Building blocks for software-defined networks (SDN) require which of the following?
Correct Answer: A
A Software-defined Network (SDN) is a network architecture that uses software to abstract the underlying physical network infrastructure and provide programmability, flexibility, and control over the network resources. In order to build a SDN, it is necessary to have the network infrastructure composed mostly of virtual machines (VMs) or virtual network functions (VNFs) that are running on top of a physical infrastructure, these VMs or VNFs are the building blocks for the SDN. These virtualized components can be easily moved, scaled, and managed, providing the flexibility and programmability required for a SDN.