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What is MultiProtocol Label Switching

Chapter 152
Encyclopedia of Information Technology Curriculum Integration
( MPLS ) : A data-carrying mechanism which emulates some properties of a circuit-switched network over a packet-switched network. 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 thus is often referred to as a “Layer 2.5” protocol. It was designed to provide a unified data-carrying service for both circuit-based clients and packet-switching clients which provide a datagram service model. It can be used to carry many different kinds of traffic.
Published in Chapter:
Wide Area Networks
Raymond A. Hansen (Purdue University, USA) and Phillip T. Rawles (Purdue University, USA)
Copyright: © 2008 |Pages: 8
DOI: 10.4018/978-1-59904-881-9.ch152
Abstract
When network services must be distributed over large geographic areas, it is essential to have an understanding of the telecommunication systems on which such distribution depends. One of the most significant differences between wide area networks (WANs) and local area networks (LANs) is the general dependency on third-party carriers to provide these transmission services. Whenever data is being sent across a WAN it must be routed between locations.
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