Glossary:Multiprotocol Label Switching
Also known as MPLS. A protocol that is designed to provide a unified data-carrying service for both circuit-based clients and packet-switching clients, which provides a Datagram Service Model. MPLS can be used to carry many different kinds of traffic, including IP packets, as well as native ATM, SONET, and Ethernet frames. MPLS operates at an OSI model layer that is generally considered to lie between traditional definitions of Layer 2 (data-link layer) and Layer 3 (network layer), and therefore is often referred to as a Layer 2.5 Protocol
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