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CE technology can also apply to the Wide Area Network (WAN) though the concept was originally proposed for MAN. All CE Network Elements (NEs) must pass certification tests so that they can serve users worldwide. CE makes use of Ethernet’s compelling cost-effectiveness advantage to achieve significant benefits, and enables fast deployment of new distributed applications for enterprises. The MEF has defined CE as ubiquitous, standardized, carrier-class networks and services with five technical features that distinguish CE from LAN-based Ethernet. In 2005, the MEF changed the name of metro Ethernet into Carrier Ethernet (CE) to further specify that it is a type of Ethernet technology used in carrier networks. Aiming at delivering carrier-class Ethernet services, the Metro Ethernet Forum (MEF), founded in 2001, proposed a method for using enhanced Ethernet technologies in MAN and brought forward the concept of metro Ethernet. Ethernet technology must be improved in terms of security, scalability and manageability for applying in carrier networks oriented to public users. Originally designed for LAN environment, Ethernet technology is oriented to enterprise Intranet and thus is "enterprise-class". As a type of Local Area Network (LAN) technology most widely used in computer networks, Ethernet technology features in easy-to-use, low cost and excellent flexibility.