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For example, let s say that when someone in the purchasing department sends a job to the printer, it takes over five minutes for the job to print As in the preceding section, we need to find out if more than one computer is having this problem We send a print job from another computer only to discover that the print job once again takes five minutes to print We now have a consistent problem that is replicable The problem is not computer specific because we were able to replicate the problem on another computer When we take a look at the print server s health we notice that its processing power and memory utilization are high we need to know why, but at least we have found the source of our problem Chances are, if we can free up system resources we will have a better performing print server Once again, notice how quickly we narrowed the problem to a possible source Furthermore, notice how we used logic to determine the cause of the problem We went to the next logical source in our printing problem the print server We didn t immediately go to the router and check to see whether it was routing correctly, and we didn t go to the domain controller to check whether the user had rights to print to this printer We used logical troubleshooting methodology to arrive at the solution to the problem

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As you learned in the preceding section, it is important to isolate the subsystem involved with a problematic process When you work with a problem internal to one computer, you learn to isolate the subsystem involved For example, say that your system is not detecting your primary hard drive What subsystem do you check You check the disk subsystem, which includes the hard disk drive, the drive controller, and the drive cable You wouldn t begin your troubleshooting by removing the video card and the CD-ROM drive You must apply this methodology to solving network-related problems as well In the preceding section, you knew you had a printing problem, so your troubleshooting remained focused on the printing subsystem; you tracked the problem by following the flow of information You would have been led to a problem outside the printing subsystem if you researched the problem and found out that everything you did on the network, not just printing, took five minutes

The Source and Destination Port fields are each 2 octets in length and function in a similar manner to their counterparts in the TCP header In other words, the source port field is optional, and a value is either randomly selected or is filled with zeros when not used The destination port, however, contains a numeral which identifies the destination application or process Because UDP is commonly used by several Internet telephony products that do not use a standardized port number, you must determine the port that a specific product uses Then, you will probably have to reprogram your organization's router access list and modify the configuration of any firewalls used by your organization This action will enable UDP datagrams using ports previously blocked to transport Internet telephony data onto your private network via the Internet

To verify that your network card is working properly, check out Exercise 13-1 in LabBookpdf on the CD-ROM and watch the CertCam training video

13:

When you are troubleshooting network problems, it is important to follow a logical troubleshooting methodology Always assume that the problem is a simple one It might sound counterintuitive, but the simple solutions are most likely to elude you As your experience grows, you can easily find yourself caught in a web of always assuming that the problem is more complicated than it actually is When that happens, it can result in an excessive waste of troubleshooting time Don t forget to ask yourself three basic troubleshooting questions: 1 Did the device ever work 2 When was it last known to be working 3 What has changed since then Remember this: As an administrator, you are a doctor Your patients are computers and networking equipment As with any doctor, your first step to finding a cure is making a proper diagnosis Use logic and the scientific method, and do not forget to use one variable at a time To put it in plain English: fix one thing at a time! Always remember to start with the simplest things before checking the more complicated items Most of the time, the problem is caused by something simple It s easier to check simple items than complicated ones, and doing so can save a great deal of time Complicated items can take hours to check, whereas simple items can take only seconds or minutes A process you can follow to help you troubleshoot a problem is presented in the eight steps to troubleshooting that follow: 1 Identify the symptoms 2 Identify the affected area 3 Establish what has changed 4 Select the most probable cause 5 Implement a solution 6 Test the result 7 Recognize the potential effects of the solution 8 Document the solution