k for a major stadium. The stadium was divided into four segments, each of which had its own infra- structure room (closet). The users' cables were run to these closets, and the closets were linked together with fiber. Figure 33-10 shows an example of a collapsed-core network without a distribution layer. Internet Server farm 00000 Users, printers, etc. Figure 33-10. Collapsed-core network without a distribution layer Network Designs Collapsed core-no distribution or access A very popular design in companies that are contained within a single building is the collapsed network, where there are only core switches. A company with hundreds of employees that are all in a single location can often manage to have its computer room central to the environment. As long as the Ethernet runs can remain within the distance limitations of the cabling in use, all runs can be home runs back to the core switches. A pair of high-density, high-availability switches like Cisco 6509s can support hundreds of users. Such a network design is shown in Figure 33-11. Internet Server farm 00000 Users, printers, etc. Figure 33-11. Collapsed-core network consisting of only one layer Configuration concerns I'm not going to go through the detailed steps of configuring a corporate network here. Configuration details for the various devices are provided elsewhere in this book. Instead, I'll point out some elements you should consider when designing such a net- work, and try to point you in the right direction. I will be using a collapsed-core model with no distribution layer as an example. You can use Figure 33-10 as a reference. Trunks. Trunks may be necessary anywhere switches are interconnected. The obvi- ous points are between the two core switches and the links connecting the access switches to the core. Don't forget the links between each pair of access switches, either. You may choose to design your network such that the links between switches are links and not trunks. This is perfectly valid, and can make the network easier to understand 