vb.net generate data matrix barcode Examining the Network Monitor Interface in .NET

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Examining the Network Monitor Interface
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When you launch Network Monitor for the first time after installation, the Select A Network window opens, as shown in Figure 3-1, and prompts you to choose a particular network adapter through which Network Monitor should analyze traffic. The network you choose becomes the default listening network for Network Monitor whenever you open the tool. You can later access this window in Network Monitor by opening the Capture menu and selecting Networks. This allows you to switch listening networks after the first use.
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Analyzing Traffic Using Network Monitor
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Select A Network window
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After you select a network from the Select A Network window, this window closes, and the Capture window appears. The Capture window, which is the main window of Network Monitor, provides different types of useful statistical data for analyzing overall network performance. This window includes a graph pane, a session statistics pane, a station statistics pane, and a total statistics pane, as shown in Figure 3-2.
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Graph pane Total statistics pane Session statistics pane Station statistics pane
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Figure 3-2
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Table 3-2 describes the type of data summarized in each of these four panes.
Table 3-2
Network Monitor Capture Window
Description Displays the current activity as a set of bar charts indicating the following status information: % Of Network Utilization, Frames Per Second, Bytes Per Second, Broadcasts Per Second, and Multicasts Per Second during the cap ture process Displays a summary of the conversations between two hosts, and indicates which host is initiating broadcasts and multicasts Displays a summary of the total number of frames initiated by a host, the number of frames and bytes sent and received, and the number of broadcast and multicast frames initiated
Pane Graph
Session statistics Station statistics
3
Monitoring and Troubleshooting TCP/IP Connections
Table 3-2
Network Monitor Capture Window
Description Displays statistics for the traffic detected on the network as a whole, the statistics for the frames captured, per second utilization statistics, and network adapter card statistics
Pane Total statistics
Capturing Data in Network Monitor
To begin capturing data in Network Monitor, from the Capture menu, select Start. Alternatively, to start a capture you can also press F10 or click the Start Capture button on the toolbar. The Start Capture button is designated by the play symbol shown in Figure 3-3. When packets are being captured, you will see new data being registered in the panes of the Capture window. To stop the capture, from the Capture menu, select Stop. Alterna tively, to stop a capture you can also press F11 or click the Stop Capture button on the toolbar. The Stop Capture button is designated by the stop symbol shown in Figure 3-3. To view a capture, from the Capture menu, select Display Captured Data. Alternatively, to view a capture you can also press F12 or click the Display Captured Data button on the toolbar, which is designated by the eyeglasses symbol shown in Figure 3-3. You can also stop and view the data in one step. To perform this task, from the Capture menu, you can select Stop And View while the data is being captured. Alternatively, to stop the capture and view the results immediately, you can also press Shift+F11 or click the Stop And View Capture button on the toolbar. The Stop And View Capture button is designated by a combination of the stop symbol and the eyeglasses symbol shown in Figure 3-3.
Display Captured Data Stop and View Capture Stop Capture Pause/Continue Capture Start Capture
Figure 3-3 Network Monitor toolbar functions
You can use Network Monitor to find out certain details such as the MAC address of a network interface card (NIC), the globally unique identifier (GUID) of a client com puter, or the port used by a protocol that might have been lost with documentation.
Exam Tip
Lesson 1
Analyzing Traffic Using Network Monitor
Analyzing Captured Data
When you choose to view a capture, the Frame Viewer window appears, displaying the summary pane. The summary pane displays all of the captured frames in sequence, as shown in Figure 3-4.
Figure 3-4
Summary pane of the Frame Viewer window
By double-clicking any frame in the summary pane, you can toggle between the orig inal summary pane view and the three-pane view, which includes the summary pane, the details pane, and the hexadecimal (hex) pane. Figure 3-5 shows the three-pane view of the Frame Viewer window.
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