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WAN optimization is a phrase used to describe applications and products used to manage and accelerate the flow of data across a wide-area network (WAN). Some specific technologies used in WAN optimization include the following:
As mentioned, the report combines both WAN optimization and SD-WAN in its tally. $7.5 Billion by 2020. Rayno Research has a for-pay report, The Future of Cloud WAN, that looks at how the cloud and SDN/NFV are transforming the WAN market.