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https://www.fieldengineer.com/sd-wan/sd-wan-vs-mpls-vs-sdn
MPLS is a technique, not a service. It was started at the turn of the century, and it works to address determine efficient routes for packets that enter a network. Using MPLS, a packet will go into the network and be assigned to a specific FEC. It's a layer 2.5 service, and it's not as modern as SD-WAN.
