If the alternative to MPLS for broad deployment security is IPsec, then it should be an obvious choice - encryption is only a functional aspect of security, not a complete solution. Further, the apparent trend for corporate networks is toward "privatization" of networks in the general theme of the Infranet (as suggested by Juniper) – should this trend further develop, MPLS would likely be amongst the fundamental building blocks.
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Related Q&A from Retired expert - Loki Jorgenson, Ph. D.
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