MPLS Vs SD-WAN
The conversation here should begin with “where are your applications hosted and how are they used”. If the applications are primarily hosted in a centralised data centre then MPLS will offer the best connectivity to the application from the end user. However, if your organisation, as many others are now doing, is moving increasingly towards cloud hosted application (SaaS/IaaS/PaaS) and NaaS solutions, then SD-WAN would be the better connectivity option.
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In the context of network connectivity, it used to be “MPLS is the answer, what is the question?”, nowadays MPLS is just one part of the answer.