Large Building LANs

Large building LANs are segmented by floors or departments. Company mainframes and servers reside in a computing center. Media lines run from the computer center to the wiring closets at the various segments. From the wiring closets, media lines run to the offices and cubicles around the work areas. Figure 4-12 depicts a typical large building design.

Figure 4-12 Large Building LAN Design

Each floor may have more than 200 users. Following a hierarchical model of access, distribution, and core, Ethernet and Fast Ethernet nodes may connect to hubs and switches in the communications closet. Uplink ports from closet switches connect back to one or two (for redundancy) distribution switches. Distribution switches may provide connectivity to server farms that provide business applications, DHCP, DNS, intranet, and other services.

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