It is in some ways similar to an internet based VPN (Virtual Private Network) in the setup... but very different as well.
MPLS in its root is a signal formatting that allows traffic to be tagged and prioritized. Ultimately, carriers either run MPLS over their IP network cloud or some maintain a separate network cloud for MPLS only. Either way, you connect into the cloud via whatever you need. Could be a T1 or bonded T1s for one location, full or fractional DS3 for others, etc.
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