Frost & Sullivan: Software-Defined Wan And Network Virtualization
Traditionally used WANs (wide-area networks) were based on conventional routers and were never designed for the cloud. They delivered poor user experience and led to productivity loss. With advances, the SD-WAN model provides the highest levels of application performance and fully supports applications hosted in on-premise data-centers, public or private clouds, and SaaS services.
Whereas, network virtualization helps to create logical, virtual networks that are decoupled from the underlying network hardware. With virtualization, expenses are cut-down by relying on the intelligence of the overlay networking (including VLANs or virtual local area networks, IP networks) to provide necessary advanced network functionality and features.
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