A Software Defined Wide Area Network, or SD-WAN is a virtual Wide Area Network architecture that allows enterprises with multiple remote sites to interconnect those sites securely and robustly over a combination of multiple transport services, such as MPLS, cellular, fiber, and even commercial grade xDSL and cable.

Cisco acquired Viptela, a major SD-WAN player, in 2017 and re-branded it to Cisco SD-WAN. This is Cisco’s enterprise SD-WAN solution.

This solution consists of four main components and one optional analytics component:

A second type of edge router that you may encounter is the cEdge device.