Software-Defined WAN (SD-WAN) solutions aggregate, secure, virtualize, and manage WAN traffic and allow centralized, policy-driven management of the WAN as a whole. They aggregate branch connectivity transparently, pooling available bandwidth, allowing organizations to supplement or replace MPLS connections with broadband Internet links. They allow multiple, separate, segregated virtual WANs to be overlaid on the pooled connectivity, providing separate overlays for specific traffic types, sets of locations, or even sets of users. SD-WANs can manage and optimize traffic in many ways: for example, by load balancing across links, by selectively routing flows or packets based on link performance, or by doing prioritization-based traffic shaping.
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