Network virtualization and software defined networking for cloud computing: a survey

Network virtualization is the key to the current and future success of cloud computing. In this article, we explain key reasons for virtualization and briefly explain several of the networking technologies that have been developed recently or are being developed in various standards bodies. In particular, we explain software defined networking, which is the key to network programmability. We also illustrate SDN¿s applicability with our own research on OpenADN - application delivery in a multi-cloud environment.