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WEB ADDRESS (url) or title of problem page. SD WAN vs MPLS  - The Difference in the Details
ISSUE TYPE. Check all that apply. Other (see my Remarks below).
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Multiprotocol Label Switching - also known as MPLS - was around before software-defined wide area networking - also known as SD-WAN - came along to provide the benefits of SDN to networking that was hardware based.
MPLS is a protocol for efficient network traffic flow that happens between two or more locations. MPLS operates in a similar way to switches and routers and is considered to be layer 2.5. Packet-forwarding technology is used to make data forwarding decisions.