*2.6.1 History*

A group of network service providers at the Software-Defined networking (SDN) and OpenFlow World Congress in October 2012, originally presented the Network Functions Virtualization (NFV) concept (11). These service providers aimed to simplify and speed up the process of adding new network functions or applications.


**Table 1.**

*The five actors in cloud computing environment.*

*Network Function Virtualization over Cloud-Cloud Computing as Business Continuity Solution DOI: http://dx.doi.org/10.5772/intechopen.97369*
