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Rogue access point detection is also helpful for making sure that random users on networks do not plug in wireless access points or routers they may think are switches Rogue access points are discussed in further detail in 12 Most managed switches also provide some form of MAC address filtering A MAC address is a unique identifier attached to most forms of networking equipment (you can find your Mac s MAC address in the Network pane of System Preferences by clicking on the Advanced button) With MAC filtering, a network administrator can define a destination address so that packets can be received only from a specific port and allow only those same packets to be forwarded to another port.

Figure 11-5. The structure of the Model-View-Controller design pattern The model constitutes the internal representation of the information displayed by the control. A word processor, for instance, stores a document in memory as part of the model, even though the entire text doesn t fit the current visible area. In your simple button, the model is defined by the pressed and text values. When the model changes, the view must be updated, and a rendering of the information kept in memory should be performed. Usually, the paint method corresponds to the view portion of the control. Event handlers triggered by the user form the controller of the control. The controller defines how these elements affect the model. The Model-View-Controller pattern isn t the only model developed to describe graphical interfaces. However, it captures the intrinsic nature of the problem, providing a good framework for classifying the elements of an interface or a control. The rest of this chapter refers to this pattern to indicate the various elements of the applications you learn how to develop.

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Using MAC address filtering, only users who are connected to port A can access the server connected to port B; packets from other ports, even packets whose destination address is the server on port B, will be dropped MAC filtering is also referred to as network access control, although this could refer to port filtration rather than MAC filtration Here are some other features of managed switches: PoE: Power over Ethernet allows power to be supplied to network devices over an Ethernet cable, rather than over a power adapter Spanning tree: This closes loops on networks If more than one open path between any two ports were to be active at once (a loop), then a broadcast storm, or large amount of network traffic, could cause the network to become unstable.

Now that you have reviewed the essential concepts behind programming graphical interfaces, you re ready to work on some applications. They re full of details typical of real graphical applications. This section presents a graphic control whose purpose is to plot samples acquired over time for instance, from a sensor. The control has been designed to be reusable and highly configurable, providing a rich set of properties that can be set even at runtime by the application hosting it, as shown in Figure 11-6.

Pandora is an Internet radio service that lets you create custom radio stations based around a song or group (see Figure 4-18). The playlist won t consist entirely of songs from that band, but they will share common style features as analyzed by the Music Genome Project. You can refine the choices with a Like/Dislike button. It s a great way to find new music you didn t realize you liked, and it s a great way to listen to music on your phone without having to download it.

Priority tagging: This specifies ports that are of a higher priority, allowing missioncritical traffic to be differentiated from non-mission-critical traffic Link aggregation: This uses multiple network ports in parallel to increase the link speed beyond the limits of any one single cable or port Link aggregation, also known as teaming, is based on the IEEE 8023ad link aggregation standard..

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