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Figure 5-3 Personas versus market segments. Market segments can be used in the Research phase to limit the range of personas to target markets. However, there is seldom a one-to-one mapping between market segments and personas.

In the previous chapter, we focused on Ethernet switches and their features as a way to build Ethernet networks. We described how Ethernet frames are sent from one Ethernet station to another and how Ethernet frames are processed by switches to achieve this communication. We also discussed how the use of VLAns allows for the separation of an Ethernet network into separate virtual networks for security purposes and also to provide protection from excessive broadcasts. A topic that we briefly touched on was communication between different VLAns or across routers, without fully defining exactly what routers are. In this chapter, we discuss routing functions in some detail. But first, it is important to understand why a routing function is needed in the first place. The key to this topic is to understand why a Layer 3 protocol is necessary to interconnect Layer 2 networks such as Ethernet. The primary reason for this is that Layer 2 protocols such as Ethernet work on a local network only. In order to connect multiple Ethernet networks, you need a protocol that works at a higher layer: Layer 3.

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Provisional personas are structured similarly to real personas but rely on available data and designer best guesses about behaviors, motivations, and goals. They are typically based on a combination of stakeholder and subject matter expert knowledge of users (when available), as well as what is understood about users from existing market data. Provisional personas are, in fact, a more fleshed-out persona hypothesis (as described in 4). Our experience is that, regardless of a lack of research, using provisional personas yields better results than no user models at all. Like real personas, provisional personas can help focus the product team and build consensus around product features and behaviors. There are, however, caveats: Provisional personas are called this because they should be recognized as stand-ins for personas based on definitive qualitative data. While provisional personas may help focus your design and product team, if you do not have data to back up your assumptions you may:

In our discussion of Ethernet switches in 4, we mentioned that Ethernetswitched networks can provide for site- or campus-wide connectivity, and that VLAns enhance Ethernet network scalability. However, there are scalability limitations to an Ethernet network. There are several reasons for this. The first reason is that Ethernet addressing does not provide a structured hierarchy. Imagine an Ethernet switch with not just hundreds of mAC address entries in its FDB, but hundreds of thousands, and perhaps millions. Building such a list of entries and searching through it every time a switch needs to forward a packet could take an excessive amount of time and severely overload the CPU of the switch when it needs to forward hundreds of thousands of Ethernet frames every second. If this problem were not enough, it is exacerbated by the fact that many protocols use Ethernet broadcasts at least part of the time to deliver information. recall that a broadcast frame is sent out every port on an Ethernet switch except the one it was received on, and these broadcasts are received and processed by every device in a VLAn. In the case of a VLAn that might have hundreds of thousands of devices, every single one of them would receive and process each broadcast packet. Imagine a scenario in which every Ethernet-connected device was sending broadcast frames at

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