.net barcode generator Lesson 1 in .NET

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Lesson 1
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Monitoring Network Performance 12-17
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from the Caption menu, select Trigger. The Capture Trigger dialog box opens, as shown in Figure 12-15.
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Figure 12-15
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Configuring a trigger to alert you to specific conditions
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Capturing Trigger Options The default Trigger On option is set to Nothing, which means no triggers will be active. You can set up a trigger to alert you under certain key conditions. For instance, you can be notified when the buffer space is 25 percent, 50 percent, 75 percent, or 100 percent full. This might be your signal to take a look and clean it out before any packets are lost because of low buffer space. You might also decide to use the handy Pattern Match feature (selected in the figure), which allows you to type in a hex or ASCII representation of what you want to find. For instance, you could look for any instance of a clear text string of characters, and then, by using the Execute Command Line option, have a message sent to you saying that your text string was found.
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Practice: Sampling Performance
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In this practice, you try out the advanced features of Task Manager and the Perfor mance console.
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Exercise 1: Monitor Network Traffic with Task Manager
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In this exercise, you copy a large 75-MB file, called Driver.cab, from Computer1 to Computer2 and monitor the traffic using Network Monitor.
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12-18
12
Maintaining a Network Infrastructure
1. On Computer2, create a directory called C:\Temp and share it as Temp with Administrators: Full Control permissions. 2. Switch to Computer1 and while you are logged on as Administrator, press Ctl+Alt+Del and select Task Manager. Task Manager launches. 3. Select the Networking tab. 4. From the View menu, click Select Columns. 5. Choose to view the following counters:
Network Utilization Link Speed State Unicasts/Interval Nonunicasts/Interval
6. Click OK. 7. From the Start menu, select Run, and type cmd to open a command prompt. 8. At the command prompt, type net use T: \\computer2\temp. 9. At the command prompt, type copy c:\windows\driver cache\i386\ driver.cab T: /y. 10. At the command prompt, type net use T: /delete. You will see the network utilization spike on the graph. Also note that the Uni casts/Interval will rise, but the Nonunicasts/Interval should stay flat. These counter values indicate that valid data is being transferred.
Exercise 2: Create a Network Alert Using the Performance Console
In this exercise, you create a network alert in the event log of Computer1 using the Per formance console when the Packets Sent/Sec counter is more than 5. 1. From the Start menu, select Run, and type perfmon.exe. 2. Expand the Performance Logs And Alerts node, and then right-click Alerts and select New Alert Settings. 3. In the Name field, type packets sent alert and click OK. 4. On the General tab of the Packets Sent Alert window, click Add. 5. From the Performance Object list, select the Network Interface object, and choose Packets Sent/Sec from the counters in the list.
Lesson 1
Monitoring Network Performance 12-19
6. Select the instance of the network card you want to use, and click Add. 7. Click Close. 8. In the Packets Sent Alert window on the General tab, type 5 in the Limit box. 9. Select the Action tab. Ensure that Log An Entry In The Application Event Log is selected. 10. Select the Schedule tab. 11. Choose to start the scan at the current time (the default), and select OK. 12. From the Start menu, select Run and type cmd to start a command prompt. 13. At the command prompt, type net use T: \\computer2\temp. 14. Type copy c:\windows\driver cache\i386\driver.cab T: /y. 15. On Computer1, view the Application event log to see the event trigger.
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. You receive a report that Computer1 is responding slowly to user requests. You want a quick way to see which network traffic the server is using. You use Network Monitor. You want to see whether any general broadcast traffic is being sent to Computer1. Which counter should you enable a. Nonunicasts/Interval b. Unicasts/Interval c. Bytes Sent/Interval d. Bytes Received/Interval 2. You set up Performance Logs And Alerts to send a message to Computer2 to notify an operator when the network use on Computer1 gets too high. However, Computer2 never receives the message sent from Computer1. What must you do to enable messages to be sent by Computer1 and received by Computer2 (Choose all that apply.) a. On Computer1, start the Messenger service. b. On Computer1, start the Alerter service. c. On Computer2, start the Messenger service. d. On Computer2, start the Alerter service.
12-20
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