SD-WAN (Software-Defined Wide Area Network) uses central policy and software control to route traffic among sites, data centres and cloud services over one or more connections. It may select paths by application, quality, cost or availability and create an encrypted overlay, depending on the product. It cannot improve a saturated physical circuit or guarantee application performance by itself; underlay links, destinations and configuration still constrain the service. SD-WAN also does not automatically replace firewall, identity or segmentation. Design should cover applications, latency, loss, failure capacity, addressing, local breakout, monitoring and out-of-band management. Cutover, failover and recovery tests confirm how policies and active sessions behave before legacy circuits or equipment are removed.
IT glossary
SD-WAN
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