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MPLS implements VPNs by controlling the routing of packets in the network. Privacy is provided by ensuring that packets only go where they are supposed to -- encryption may not be required. Because the routing is controlled end-to-end, service providers can provide service level guarantees. In these regards, MPLS is closer to ATM or frame-relay than to public Internet VPN technologies. The future of MPLS is far from certain, but it does seem to be gaining some traction in the marketplace.
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