WAN service providers in Missouri have significantly less expensive service thanks to Software-defined Wide Area Networks (SD-WAN) which replace costly WAN routers.  They have software/hardware combinations in the parts of the network that do not require the full capablities of the router. SD-WAN can be software only, or a combination of hardware and software. Versitility is found in SD-WAN's ability to give it's customers exactly what they require and no more. As the customer's needs change at any site in the network, SD-WAN is an adaptive technology.  Businesses that have offices, cloud or colocation servers, or LANs in more than one metropolitan area should consider looking into WAN or SD-WAN providers for their data netwoking needs.