1.0 Introduction
Enterprise wide network also know as cooperate networks are private communication networks owned and run by enterprises. This kind of network provide communication platform for geographically separated site (offices) of an organization. The different offices of an enterprise could be within a locality, a state, a nation or distributed round all over the globe. An enterprise private network could also be seen as acomputer network built by a business to interconnect its various company sites (such as production sites, offices and shops) in order to share computer resources.' Also and enterprise wide area network (WAN) is a corporate networkthat connects geographically dispersed users areas that could be anywhere in the world. Enterprise WAN links LANs in multiple locations. The enterprise in question often owns and manages the networking equipment within the LANs. However, the LANs are generally connected by a service provider through leased trunks thus providing connectivity to the geographically dispersed sites [1, 2].
Briefly we present an account of the key features of the current communication environment, namely the characterization of the communication services to be provided as well as the features and properties of the underlying communication network that is supposed to support the previous services.
1.1 Historical Background
The fundamental purpose of a communication system is to exchange information between two or more devices. Telecommunication has witnessed unprecedented and explosive growth overthe years in the area of services delivered and technology. The key parameters of telecommunication service cannot be easily identified, owing to the very different nature of the various services that can be envisioned. This is basically the reason for the rapidly change in the technological environment. In fact, a person living in the sixties, who faced the only provision of the basic telephone service and the first low-speed data services, could rather easily classify the basic parameters of these two services.
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