Wide area networks (WANs) were not designed for the load that most enterprises need them to handle today. Demand for data across the distributed enterprise is growing exponentially; virtually all enterprises are using cloud technology in some form; and the Internet of Things is growing expanding the scope of networks far beyond servers, PCs, tablets and smartphones. So, it shouldn’t be a surprise that many are eagerly turning to software-defined WANs (SD-WANs) to deal with those growing needs.

SD-WANs reflected the ongoing movement to software-defined IT assets and increasing reliance on virtualization to make those assets available where and when needed. But few organizations have the fortitude—or budget—to rip and replace core pieces of their existing infrastructure, such as MPLS, which provides Class of Service prioritization and Quality of Service management.

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