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Linking is the critical navigational paradigm of the Web. Because it is a visually dislocating activity, extra care must be taken to provide visual and textual cues that help orient users. Zooming and panning are navigational tools for exploring 2D and 3D information. These methods are appropriate when creating 2D or 3D drawings and models or for exploring representations of real-world 3D environments (architectural walkthroughs, for example). They typically fall short when used to examine arbitrary or abstract data presented in more than two dimensions. Some information visualization tools use zoom to mean, display more attribute details about objects, a logical rather than spatial zoom. As the view of the object enlarges, attributes (often textual) appear superimposed over its graphical representation. This kind of interaction is almost always better served through an adjacent supporting pane that displays the properties of selected objects in a more standard, readable form. Users find spatial zoom difficult enough to understand; logical zoom is arcane to all but visualization researchers and the occasional programmer. Panning and zooming, especially when paired together, create navigation difficulties for users. While this is improving due to the prevalence of online maps, it is still quite easy for people to get lost in virtual space. Humans are not used to moving in unconstrained 3D space, and they have difficulty perceiving 3D properly when it is projected on a 2D screen (see 19 for more discussion of 3D manipulation).

What is crucial is to see how the fields of the upper IP and TCP layers are wrapped or encapsulated in the data of the lower layers Here, the IP and TCP headers are, from the perspective of the Ethernet protocol, simply bytes in its data payload Similarly, from an IP packet s perspective, TCP fields are simply bytes in its data payload This layering of headers mimics the layering of the OSI model that we have already discussed and helps you visualize what it means for a protocol stack to be layered Before we move on to Ethernet addressing, it is important to re-emphasize how Ethernet fits into the picture of the OSI model Ethernet resides at the data link layer, and this layer can be subdivided further into two sublayers already mentioned, the Logical Link Control (LLC) and the Media Access Control (MAC).

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There are many ways to begin improving (eliminating, reducing, or speeding up) navigation in your applications, Web sites, and devices. Here are the most effective:

These sublayers are shown in Figure 313 The LLC interfaces between the network interface layer and the higher L3 protocol and may provide additional functions such as flow control or retransmission The MAC layer is responsible for determining the physical source and destination addresses for a particular frame and for the synchronization of data transmission and error checking Additionally, at the physical layer, Ethernet transceivers use a link.

Reduce the number of places to go. Provide signposts. Provide overviews. Provide appropriate mapping of controls to functions. Inflect your interface to match user needs. Avoid hierarchies.

in two dimensions and also inspect node connectivity and sensing coverage. This facility allows the application developer to quickly create

integrity test to continually monitor the data path for activity. The Ethernet II type of frame used for IP does not contain an LLC header and therefore does not provide any LLC functions. IP uses Ethernet II simply for the transmission of frames on a shared media. You can see in Figure 3.12 and the description that follows it that the upperlayer protocol is IP and the Ethernet frame header is using the type field, indicating the format is Ethernet II.

The most effective method of improving navigation sounds quite obvious: Reduce the number of places to which one must navigate. These places include modes, forms, dialogs, pages, windows, and screens. If the number of modes, pages, or screens is kept to a minimum, people s ability to stay oriented increases dramatically. In terms of the four types of navigation presented earlier, this directive means:

OSI Application Presentation Session LLC Interface to the L3 protocol MAC L2 addressing, data transfer, sync, error control, and data flow Transport Network Data link Physical Lower layers Upper layers

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