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Software-defined WAN (SD-WAN) is sweeping across the , growing from an emerging technology in 2017 to become mainstream in .

Research firm IDC predicts SD-WAN revenues will $2.3 billion in 2018, growing 69% on a compound annual rate to reach more than $8 billion by 2021. “2017 saw a lot of adopters of SD-WAN that were limited to maybe two or three sites,” says IDC networking analyst Brad Casemore. “Now, rollouts are getting a lot bigger; we’re starting to see hockey-stick inflection point.”

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