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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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Introduction to MPLS VPN

This section introduces virtual private networks (VPN) in general and MPLS VPN specifically.

Definition of a VPN

A VPN is a network that emulates a private network over a common infrastructure. The VPN might provide communication at OSI Layer 2 or 3. The VPN usually belongs to one company and has several sites interconnected across the common service provider infrastructure. The private network requires that all customer sites are able to interconnect and are completely separate from other VPNs. That is the minimum connectivity requirement. However, VPN models at the IP layer might require more than that. They can provide connectivity between different VPNs when that is wanted and even provide connectivity to the Internet. ...

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