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Network function virtualization
In computer science, network-function virtualization (NFV) is a network architecture concept that uses the technologies of IT virtualization to virtualize entire classes of network node functions into building blocks that may connect, or chain together, to create communication services.
NFV relies upon, but differs from, traditional server-virtualization techniques, such as those used in enterprise IT. A virtualized network function, or VNF, may consist of one or more virtual machines running different software and processes, on top of standard high-volume servers, switches and storage, or even cloud computing infrastructure, instead of having custom hardware appliances for each network function.
For example, a virtual session border controller could be deployed to protect a network without the typical cost and complexity of obtaining and installing physical units. Other examples of NFV include virtualized load balancers, firewalls, intrusion detection devices and WAN accelerators.〔(【引用サイトリンク】url=http://www.etsi.org/deliver/etsi_gs/NFV/001_099/001/01.01.01_60/gs_NFV001v010101p.pdf )〕
==Background==
Product development within the telecommunication industry has traditionally followed rigorous standards for stability, protocol adherence and quality. While this model worked well in the past, it inevitably led to long product cycles, a slow pace of development and reliance on proprietary or specialist hardware, e.g., bespoke application-specific integrated circuits (ASICs). The rise of significant competition in communication services from fast-moving organizations operating at large scale on the public Internet (such as Google Talk, Skype, Netflix) has spurred service providers to look for ways to disrupt the status quo.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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