Initially launched as a form of optimising traffic across MPLS and IP-based connectivity, SD WAN has assumed a rapid pace of evolution. Its swift evolution is being driven not just by the growth of cloud and need for secure access at a fast-changing network edge, but by the continual change in enterprise network architectures. The result is SD WAN 2.0, or next-generation SD WAN. These offerings go well above and beyond the basic capabilities of the initial software overlay service, to meet the increasing demands of the enterprise market.