SD-WAN, put simply, is the ability to make your network redundant. In a business world it can be crucial that you have a working internet connection for both corporate computers, and in some cases point of sale. With SD-WAN you are able to take multiple internet connections, referred to as uplinks and have them act in tandem to strengthen your network. You can have one be active, and the other sitting there waiting for the main one to fail due to an outage, so it can then take its place as the new active connection. Alternatively, they can both be active and you can shape the traffic as you see fit. Shaping traffic is a whole different can of worms, but to briefly touch on it, you can balance the load of your traffic between your two uplinks and even go so far as to set custom rules that only certain traffic traverse one uplink and other traffic out another. In a real world scenario, you may want to allow video or streaming traffic out your faster internet uplink, and other traffic like web browsing out of a slower uplink. You could even set rules for traffic based on a specific computer being able to only access one of the uplinks, or a specific department in an office building, the power and choice is all yours.
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