Anenterprise network consists of an interconnected group of telecommunication facilitiesthat are confined to a singular entity. There can be broad, midrange, and narrow interpretations of the definition. The “singular entity” may be government or an industrialenterprise. FTS2000, the large GSA (General Services Administration) that was charteredto serve all U.S. government organizations, is an example of a broad interpretation. Thisnetwork provides multiple services: voice data and image. It is the U.S. government’sown PSTN. A narrow interpretation might be Corrugated Box Works local area network.Or Walgreens’ large VSAT network. This latter example is included because the networkserves a singular purpose, for logistics and cash flow, and is owned by one entity.This chapter will be based on the narrower interpretation and will be confined to thevarious data networks that may be employed in government and industry. We first presentan overview of local area networks (LANs) followed by a discussion in the next chapterof wide area networks (WANs).
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