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. https://www.nojitter.com/sd-wan/sampling-many-flavors-sd-wan
blog article
SAMPLING THE MANY FLAVORS OF SD-WAN
Not everyone is fully aware that software-defined WAN (SD-WAN) solutions can be designed differently. Enterprises considering SD-WAN should understand how the design impacts total costs, network reliability, application performance, and service-level promises. The good news is that your choices are no longer limited to expensive MPLS networks or unreliable Internet-based VLANs.The first type of SD-WAN design is the appliance-based pure overlay, which uses an on-premises router. This unit often replaces the standard site router at smaller offices or is a software feature activated in an edge router. READ MORE