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Network-Based VPN Services: Page 10 of 12

IP VPN Dedicated Service. MCI, (703) 886-5600, (877) 227-5624. www.mci.com

Darrin Woods is a Network Computing contributing editor. He has worked as a WAN engineer for a telecom carrier. Write to him at [email protected].

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IP virtual private networks offer lower costs and higher bandwidth than dedicated frame relay networks, and have become a popular means of transferring data from remote locations back to the corporate network.

Most carriers implement this technology by tunneling data over the Internet, using various IP protocols. However, MPLS (Multiprotocol Label Switching) is slowly gaining ground--or at least attention--as an even more secure solution. Expect to pay a hefty premium for this service, if and when it becomes available in your neighborhood.

We sent an RFI in the name of a fictitious aircraft manufacturer, Wing and a Prayer, to 10 vendors, asking for their proposals to help WAAP find a less expensive way to network its offices and design plants in five U.S. cities.

Four vendors--MCI, TManage, Qwest Communications International and Virtela Communications--responded to our query. MCI, in fact, sent two proposed solutions: one standard IP VPN and one with MPLS technology. Although we thought all the offerings were worthy, we were most impressed with newcomer Virtela. This vendor put together a comprehensive response and came up with a solution that would be relatively easy to migrate to without busting the budget. Cinching the deal were the generous policies found in Virtela's service-level agreement.