The most common means for enterprises to connect branch offices into the corporate data center is predictable, reliable, and relatively secure. Yet multi-protocol label switching (MPLS) is also expensive and inflexible, often requiring months to bring up a new branch. Today's hyper-connected, cloud-based envrionments demand greater agility and efficiency. Enter the software-defined WAN, which can address this shortcoming in traditional WAN architectures by putting an overlay on top of them.
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