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Multi-Protocol Label Switching. A protocol that simplifies and speeds up the transmission of data packets, directing them from one network node to the next. MPLS is the standard carrier mechanism for telecommunications networks.

MPLS (Wikipedia)

Multiprotocol Label Switching (MPLS) is a routing technique in telecommunications networks that directs data from one node to the next based on short path labels rather than long network addresses, thus avoiding complex lookups in a routing table and speeding traffic flows. The labels identify virtual links (paths) between distant nodes rather than endpoints. MPLS can encapsulate packets of various network protocols, hence the "multiprotocol" reference on its name. MPLS supports a range of access technologies, including T1/E1, ATM, Frame Relay, and DSL.

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