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For more information about troubleshooting techniques and tools, see Appendix C, Tools for Troubleshooting; 27, Understanding Troubleshooting; and Windows XP Professional Help and Support Center.

Many network protocols make extensive use of broadcasts to maintain consistent communications across the network. Although this is rarely an issue on smaller networks, as networks begin to scale upward, broadcasting can result in out-of-control traffic that can be crippling. The biggest offenders when it comes to generating broadcast traffic include SAP and AppleTalk. To prevent broadcast traffic from consuming an inordinate amount of the bandwidth available on the network, routing must be used. Routers can be configured to block broadcasts. This ability to segregate broadcast traffic allows a broadcast-dependent protocol such as SAP to operate on one portion of the network without negatively impacting the rest of the network.

Windows XP Professional includes tools to help you diagnose and resolve networking problems. For information about the use and syntax of the troubleshooting tools, see Appendix C, Tools for Troubleshooting. Event Viewer Event Viewer allows you to monitor events in your system. It maintains logs about program, security, and system events on your computer. You can use Event Viewer to view and manage the event logs, gather information about hardware and software problems, and monitor Windows XP Professional security events. The Event Log service starts by default when you start Windows XP Professional. All users can view application and system logs.

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An event log consists of a header, a description of the event (based on the event type), and additional data (optional). A typical log entry consists of the header and a description as shown in Figure 23-6.

Figure 23-6

To use Event Viewer to access a security log 1. Right-click My Computer, and then click Manage. 2. Click System Tools, click Event Viewer, and then click Security. 3. In the list of specific security events, double-click the most recent one. 4. In the Event Properties dialog box of the specific security event, read the information about the event and relevant data. 5. Event Viewer categorizes events by log type (for example, security or system) and displays a separate log for every event, which includes date, time, source, category, ID, user account, and computer name. The log types that directly relate to a user logging on are the security and system logs. Table 23-4 provides a description of these log types and how they can be used in troubleshooting.

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Description The Security Log records security events such as valid and invalid logon attempts and events related to resource use such as creating, opening, or deleting files or other objects providing auditing has been configured for the computer or domain. For example, the Security log records a user s inability to log on to a domain account as a result of an incorrect or invalid user ID/password combination. The System Log records events logged by the Windows XP Professional system components. For example, if a driver or other system component fails to load during startup, it is recorded in the System Log. Also, the System Log records a duplicate computer name on the domain as an error message sent by NetBT.

Part IV:

<Label Grid.Column= 0 Grid.ColumnSpan= 2 Grid.Row= 0 >Type an Internet address and My Own WPF Browser will open it for you</Label> <TextBox Name= Url Grid.ColumnSpan= 2 Grid.Column= 1 Grid.Row= 1 > </TextBox> <! Accept or Cancel > <StackPanel Grid.Column= 0 Grid.ColumnSpan= 2 Grid.Row= 2 > <Button Name= okButton Click= okButton_Click IsDefault= True >OK</Button> <Button Name= cancelButton Click= cancelButton_Click IsCancel= True >Cancel</Button> </StackPanel> </Grid > </Window>