Virtual Network Functions are a new trend in the architecting of network services. In VNF terminology, a single network function is decomposed into multiple modules or services, which are then deployed using a combination of virtual machines and cloud deployment, under the control of an orchestration solution such as Openstack, typically deployed over an SDN networking infrastructure. By disintegrating the service into micro-services and then using sophisticated mediation, orchestration and scaling services, the network operator can have optimal allocation of both computing and networking resources.
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