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define the user as a computer-literate power user. Other times, when it is more convenient to step through a difficult process with a wizard, they define the user as an unsophisticated first-time user. Designing for the elastic user gives a productdevelopment team license to build what it pleases, while still apparently serving the user. Of course, our goal should be to design products that appropriately meet the needs of real users. Real users and the personas representing them are not elastic, but rather have specific requirements based on their goals, capabilities, and contexts. Even focusing on user roles or job titles rather than specific archetypes can introduce unproductive elasticity to the focus of design activities. For example, in designing clinical products, it might be tempting to lump together all nurses as having similar needs. However, if you have any experience in a hospital, you know that trauma nurses, pediatric intensive-care nurses, and operating room nurses are quite different from each other, each with their own attitudes, aptitudes, needs, and motivations. A lack of precision about the user can lead to a lack of clarity about how the product should behave.

message log pane for that node, changing the color of the node in the display, drawing a circle around the node to indicate some node state of interest, etc. The information sent as part of a GUIMessage is shown in the code listing of Figure 4.17. Additional message types and their associated variables can be easily defined by adding the corresponding code to this class.

Figure 4.14 As broadcasts increase on a flat network, they quickly consume all available network resources.

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Self-referential design occurs when designers or developers project their own goals, motivations, skills, and mental models onto a product s design. Many cool product designs fall into this category. The audience doesn t extend beyond people like the designer, which is fine for a narrow range of products and completely inappropriate for most others. Similarly, programmers apply self-referential design when they create implementation-model products. They understand perfectly how the data is structured and how software works and are comfortable with such products. Few nonprogrammers would concur.

The use of VLANs allows for the isolation of groups of users so that one group is not interrupted by the broadcast traffic of another. By segregating a group of devices to a particular VLAN, a switch will block broadcasts from devices in that VLAN to devices that are not in that VLAN instead of flooding it out every port. VLANs also have the benefit of added security by separating the network into distinct logical networks. Traffic in one VLAN is separated from another VLAN as if they were physically separate networks. If traffic is to pass from one VLAN to another, it must be routed. This logical separation regardless of physical location is a very powerful concept. For example, you could have a low security device and a high security device physically attached to the same Ethernet switch (indeed, they could be attached on adjacent physical ports). By configuring each device into a separate VLAN, neither device could communicate directly with the other without going through a router.

Another syndrome that personas help prevent is designing for edge cases those situations that might possibly happen, but usually won t for the target personas. Typically, edge cases must be designed and programmed for, but they should never be the design focus. Personas provide a reality check for the design. We can ask, Will Julie want to perform this operation very often Will she ever With this knowledge, we can prioritize functions with great clarity.

While in theory there are many ways to create VLANs such as by MAC address, IP address, workstation names, and so on in practice, these methods are very cumbersome and ultimately unsupportable. The primary way that VLANs are created in modern networks is by physical port, and that is the method that we will address for the remainder of this chapter. Each VLAN is identified by a VLAN ID (VID), which is usually a number such as 100, 101, and the like. They can reside on only a single switch, or they can be distributed throughout the entire network on each switch. You can think of a VLAN as a broadcast domain, and, in fact, that is exactly what it is (recall our earlier discussion of broadcast domains in 3). Each device in a VLAN, regardless of its physical location, can communicate directly with every other device in the same VLAN and cannot communicate outside of the VLAN except through a router. So with this background, let s examine how this process actually works. In Figure 4.15, VLANs subdivide the Ethernet switch into multiple virtual switches. Note that there are no logical interconnections between these internal switches. Therefore, the broadcast traffic that is generated by a host in a VLAN stays within that VLAN, making the VLAN its own broadcast domain. Because broadcast traffic for a particular VLAN remains within that VLAN s borders, inter-VLAN or broadcast domain communication must occur through a Layer 3 device such as a router, as previously noted.

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