Traditionally, companies relied on traditional WANs to provide services for their organizations. Managers soon realized that standard WANs (in conjunction with the legacy circuits they ride on) are expensive to maintain and operate. Ever since the explosion of cloud technology, traditional WANs have been struggling to keep pace with business demands. They are limited due to the fact that the data riding between locations relies on singular paths, often causing a backhaul and congesting the network. They are also non-friendly to virtualization, as network devices that have already deeply embedded into the legacy architecture force businesses to rely on proprietary hardware, adding to company expenses and limiting their flexibility.
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