Hybrid Multiprotocol Label Switching (MPLS)/Internet WAN models combine the use of two major Internet Protocol (IP) WAN technologies, commonly carrier MPLS networks and IPsec virtual private networks (VPNs) over Internet infrastructure, in a consolidated enterprise WAN. While Internet-based VPNs are commonly used for smaller offices, and MPLS tends to be the basis of major corporate network backbones and larger offices, this approach uses both network types at a specific site.