The explosion of cloud services and frustration surrounding the high cost and inflexibility of Multiprotocol Label Switching (MPLS) networks has forced a rethink of the enterprise WAN. Companies are now looking to the Internet as their WAN, which opens the door for faster WAN provisioning and the ability to use multiple WAN paths at the same time. This WAN transformation is referred to as the software-defined WAN (SD-WAN).
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