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A user s mental model doesn t necessarily have to be true or accurate, but it should enable him to work effectively. For example, most nontechnical computer users imagine that their video screen is the heart of their computer. This is only natural because the screen is what they stare at all the time and is the place where they see what the computer is doing. If you point out to a user that the computer is actually a little chip of silicon in that black box sitting under his desk, he will probably shrug and ignore this pointless (to him) bit of information. The fact that the CPU isn t the same thing as the video display doesn t help him think about how he interacts with his computer, even though it is a more technically accurate concept.

Figure 11.15: The Service Provider Core network provides the infrastructure to connect geographically separate customer equipment in a seamless, invisible fashion.

3 3 3 7 Service The Datapool provides two types of interfaces. The first ... interface includes the get (1 and put (1 commands used to add data items to

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It is much easier to design software that reflects its implementation model. From the developer s perspective, it s perfectly logical to provide a button for every function, a field for every data input, a page for every transaction step, and a dialog for every code module. But while this adequately reflects the infrastructure of engineering efforts, it does little to provide coherent mechanisms for a user to achieve his goals. In the end, what is produced alienates and confuses the user, rather like the ubiquitous external ductwork in the dystopian setting of Terry Gilliam s movie Brazil (which is full of wonderful tongue-in-cheek examples of miserable interfaces).

Figure 11.15 shows the topology for this section. The VPN framework resides within the domain of a single ISP. The edge routers (PE1 and PE2) are the only ones shown explicitly, although there could be many other Provider Core (P) routers. The network cloud is a reminder that the edge routers may have a direct link or may be joined by many intervening routers. An IgP is always a necessity; we ll reuse most of the configuration from 9. The task in this section is to build SDPs (shown as dotted arrows) between the PE routers. Objective In this exercise, you will configure OSPF as the core IgP within a single domain, configure LDP, and create a full mesh of SDPs between PE routers. This creates the infrastructure to support the VPLS service in the next section. Validation You will know you have succeeded if the SDPs between the PE routers are admin and operationally Up after completing all steps, and the two customer-facing (Ethernet) ports are in access mode.

User interfaces and interactions designed by engineers, who know precisely how software works, quite often lead to a represented model that is very consistent with its implementation model. To the engineers, such models are logical, truthful, and accurate; unfortunately, they are not very intelligible or effective for users. The majority of users don t much care how a program is actually implemented.

The BGP configuration from the previous chapter s exercises is not needed for this chapter. Although BGP should not interfere with these exercises, you are advised to remove it completely for the sake of simplicity and ease of debugging. The command outputs for these exercises were obtained with BGP removed.

A good example of a digital product that conforms to implementation models is the typical component home theater system, which requires the user to know exactly how all of the components are wired together in order to switch, say, between viewing a DVD and tuning a cable TV channel In most products, users need to switch video sources, and sometimes even switch between multiple remote controls, to access the functions they need simply to watch their television A more mentalmodel-centered alternative, adopted by some newer products, is to keep track of the component configuration in the remote, so that the user can simply pick Watch TV, and the remote sends the appropriate commands to the TV, cable box, DVD player, and surround audio system without the user needing to know what s going on behind the scenes Even the Windows user interface slips into the implementation model sometimes.

1. (Optional) Completely remove the BgP configuration on all routers. (Refer to Lab Section 10.1 in 10.)

and remove data items from the data pool, respectively. putFromNetwork0 is a minor variant of the put 0 call that is invoked when the data item arrives from the network interface instead of being produced by an application task. The second interface supports a variety of calls used to query the state of data items in the pool; e.g., whether an instance of a data item is available or unavailable, active or inactive, etc. These terms are defined and explained in more detail in Section 3.3.3.3.

*B:PE1# configure router *B:PE1>config>router# bgp shutdown *B:PE1>config>router# no bgp *B:PE1>config>router# exit *B:PE1#

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