Software-defined networking (SDN) has already arrived in the data center, providing the agility and responsiveness data center networks need to meet the demands of cloud computing, says research firm International Data Corp. (IDC).

Now the focus is shifting toward wide area networks (WANs), which can also be optimized to meet the requirements of cloud applications and services, ID says. In its first forecast of the software-defined WAN (SD-WAN) market, the firm estimates that worldwide SD-WAN revenues will exceed $6 billion in 2020, with a compound annual growth rate (CAGR) of more than 90% over the 2015-2020 forecast period.

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