vb.net datamatrix generator Maintaining a Network Infrastructure in .NET framework

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Maintaining a Network Infrastructure
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Task Manager is a great tool for inspecting many areas of your server all at once. One area it can help you learn about your system is, in fact, networking performance. Although Task Manager might be less powerful than other tools (which you will explore later in this chapter in the section Performance Console Differences ), it is quite simple to access and can tell you a lot about the activities on your network. To access Task Manager, you press Ctl+Alt+Del and click the Task Manager button. Then select the Networking tab, as shown in Figure 12-1.
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Figure 12-1
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The Networking tab provides an overview of the use on your network card. The scale on the left is the percentage used, and it automatically changes scale depending on how much the link is used. You can also determine other miscellaneous data such as whether the link is operational or unplugged by looking at the State column. And in the Link Speed column, you can see what speed the link is.
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If you are receiving reports that the server is not responding fast enough to reads or writes, you might want to isolate the view of the network traffic. Indeed, you can choose to show and highlight the total traffic (the default) or choose to show and highlight the bytes sent or bytes received, as shown in Figure 12-2.
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12-5
Figure 12-2
Filtering by selecting Bytes Total, Bytes Sent, or Bytes Received
Filtering allows you to ignore the other direction of the network flow. That is, if you are troubleshooting a server that is not responding quickly to writes, you can tempo rarily ignore the bytes sent. Conversely, if you are troubleshooting a server that is not responding quickly to reads, you can temporarily ignore the bytes received.
Choosing Columns
As you saw in Figure 12-1, you can obtain an overview of some important state data, such as link speed. However, Network Monitor can also be a useful tool to determine which types of traffic are coming across the interface. Your view of what s going on is greatly enhanced by means of a network counter: an exposed piece of information, sometimes called a data point, that you can access to see the current status. If you determine the value of an available data point over time, you are sampling the data. You can choose to add more counters in the overview by opening the View menu and selecting Select Columns. Then you will expose all the available counters, as shown in Figure 12-3.
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Maintaining a Network Infrastructure
Figure 12-3
Choosing the counters you want to see
There are 26 counters for you to examine. However, not every counter will be impor tant in your troubleshooting. Table 12-1 shows some of the most useful counters for troubleshooting network performance.
Table 12-1
Helpful Counters
Description The name of the network adapter. This check box is always selected. If you have multiple network adapters, you will see multiple listings. The speed of the network interface. If you suspect a bottleneck, verify that this number is the maximum speed of the network. Sometimes, the network card receives a signal from the router to fall back to a slower speed (typically 10 Mbps from 100 Mbps). The rate at which bytes are sent and received on the network adapter. You can best judge this counter after gaining a baseline of your opera tions when your network is running smoothly. The number of unicast datagrams received during this interval. If this counter has data, you are likely dealing with real data and not broadcast traffic, which might be seen in the next counter, Nonunicasts/Interval.
Property Network Adapter Name Link Speed
Bytes/Interval
Unicasts/Interval
Nonunicasts/Interval The number of broadcast and multicast datagrams received during this interval. If this counter has data, your interface might be dealing with background or broadcast traffic. You might have problems on your network that aren t specifically related to this server if this counter is high.
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