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Maintaining a Network Infrastructure
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3. You suspect that a virus has infected your computer running Windows Server 2003. You believe this virus is transmitting data from your server over the network using a specific port. You want to determine which process is using a specific port. Which command should you run a. Nbtstat RR b. Nbtstat r c. Netstat a d. Netstat o
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Task Manager provides immediate results about how a system is performing. The Performance console delves deeper into a system through the use of counters, which find trouble spots. The Performance console alerts allow you to send a notification once a trigger has been set off. Network Monitor allows you to capture specific packets from your network to analyze network activity. Network Monitor triggers send you a message if the buffer becomes full or if the data you are looking for appears on the network.
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Troubleshooting Internet Connectivity 12-21
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Lesson 2: Troubleshooting Internet Connectivity
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Sometimes an end user calls the help desk and boldly proclaims that the Internet is down. However, usually the user s connection to the Internet is down. In fact, quite often, just one missing link in a chain of events typically leads that user from his or her desktop out to the Internet. This section explores several places that could be at fault should a user report that the Internet or, more likely, that his or her connection to the Internet is down. Two approaches exist to troubleshooting Internet connectivity problems: from the top down or from the bottom up. That is, you can troubleshoot from the server connection and work your way closer to the client, or you can start at the client and see how far you can connect. Neither approach is strictly better than the other. On one hand, starting from the client s machine and working up could be better and faster; but traveling to the desktop could be a hassle and be a slow start. On the other hand, starting from the server and work ing down could be quicker if you spot the problem right away; but if you can t find it right away, you could be potentially led down different network paths back to the client none of which are really a problem. Therefore, the best advice in troubleshooting these kinds of errors is to troubleshoot from the bottom up and travel to the client and work your way back through your network and out to the Internet.
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Identifying the Specific Networking Issue
The first problem to gauge in troubleshooting connectivity to the Internet is to decide whether the problem is network related or name resolution related. The following sec tions take a look at each scenario.
Identifying Connectivity Issues
To verify whether it is a connectivity issue, you should start your journey with the Ping command. For instance, take a look at the example shown in Figure 12-16.
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Maintaining a Network Infrastructure
Figure 12-16
DNS responding, but packets not finding the destination
If you look closely, you can already get a clue about what might be wrong with this user s ability to connect to the Internet. Specifically, notice that Ping is returning the proper name of the target address (tailspintoys.com), but the Ping requests themselves are not making it through to the target. Therefore, name resolution to a DNS server is likely working properly, but the packets are probably not reaching their final destination. The next most logical tool to use is PathPing, which shows you each route between the client and the target and helps you determine which link is not passing the packet on to the next destination.
Identifying Name Resolution Issues
Figure 12-17 shows another example that you might encounter.
Figure 12-17
DNS unable to resolve requested host name
Here, the result returns no sign that the name resolution is occurring. In this situation, the next logical step is to verify the user s DNS settings and server to ensure that both are returning the values expected from the Ping operation. Check to see that the client s network adapter is using a DNS server that is part of your network. (Use the materials found in the next section, Verifying the Computer s Network Settings. )
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