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As mentioned previously, a really important security measure to take with your network is to lock down certain types of outgoing traffic on specific ports. For example, in an educational environment, a system administrator may want to lock down most types of outgoing Internet traffic. Remote control applications, instant messaging applications, and file-sharing peer-to-peer software all tend to be unnecessary on client computers in a classroom environment. Because these programs make requests for outgoing traffic, they will need their ports locked down for them to be properly secured. In the workplace, you might want to block streaming Internet music stations to help conserve precious bandwidth, or you might want to restrict staff from using a file-sharing protocol

The application s output is shown in Figure 11-9, where the elements are rotated according to the indicated transformations: the container is laid out rotated 45 degrees counterclockwise, and the text box is rotated 90 degrees clockwise Listing 11-9 XAML Defining the Composition of Transformed Elements <Window xmlns="http://schemasmicrosoftcom/winfx/2006/xaml/presentation" xmlns:x="http://schemasmicrosoftcom/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Canvas> <StackPanel Orientation="Horizontal" VerticalAlignment="Center"> <StackPanelLayoutTransform> <RotateTransform Angle="-45"/> </StackPanelLayoutTransform>.

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to keep them from taking creative assets out of your environment. All of this must be configured using the command line. Some outgoing network traffic blocking can be configured using a firewall device at the edge of your network, but not all. Even if it is possible at the firewall-device level, it s wise to impose a rule at both the software level and the hardware level to circumvent a breach at one of your layers of defense. This layered, or tiered, approach to security helps keep your network as secure as possible. But little of this would be possible without ipfw. Another reason to use ipfw to configure your firewall is to block outgoing traffic for certain ports, a feature not available otherwise. NOTE: Later in this chapter we will discuss blocking outgoing traffic, but it is important to point out that you can block outgoing traffic only by using either the command line or a third-party application. You can block incoming traffic by using the built-in firewall in System Preferences.

<TextBlock>This is a test</TextBlock> <TextBox Name="Input"> <TextBox.LayoutTransform> <RotateTransform Angle="90"/> </TextBox.LayoutTransform> Input here </TextBox> <Line X1="0" X2="50" Y1="0" Y2="50" Stroke="Black"/> </StackPanel> </Canvas> </Window>

Most of the document management software listed earlier can handle viewing PowerPoint files. Chances are slim that you ll need to actually present from your Android phone, but, if you need to, you can use Docs to Go or the slideshow feature in your phone gallery in a pinch. At this time, most Android phones do not support TV out, so you can t just plug it into a TV or monitor and see video images. This is a hardware not software limitation, so most of us actually giving presentations using Android phones are stuck projecting them from an Elmo. However, the Droid Incredible and HTC EVO do come with TV out capabilities, which means future phones may do the same. That also means you can pair them with portable projectors that take standard TV connections, use MightyMeeting (Figure 15 5), and leave the PC behind.

The firewall located on the Sharing pane in Tiger is based on the open source program ipfw. Ipfw is short for Internet Protocol Firewall and can also be used with Leopard and Snow Leopard. The ipfw program has the ability to configure the port-based firewall in OS X, different from the application layer firewall in that rather than relying on application signatures it monolithically blocks specified ports. However, there is a rather steep learning curve when configuring the firewall with the ipfw interface for the first time, especially if you aren t very experienced with BSD. But learning curves are good. They offer you a chance to know more about the firewall on your system, what it is doing, and the key factors you should consider to make your network more secure. You also have the opportunity to get to know more about the inner workings of your system and how the different pieces to the security puzzle fit together. Because ipfw works at the kernel level, or innermost level, of the operating system, it has particular security requirements and requires that you run it from a superuser account. This is accomplished by using the sudo command to issue commands and create rules for it. Applications such as LimeWire or Samba (the Windows file-sharing component of Mac OS X) cannot override rules enforced by ipfw because of the secure nature of the command. The official syntax for the base ipfw toolkit is as follows:

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