Now that we have covered the basics of network troubleshooting, we should go over a few troubleshooting tips. These tips will give you more “ammo” while you’re hunting for network problems and using the various steps of the troubleshooting model discussed earlier.
Don’t Overlook the Small Stuff
If you’ll remember, the first thing we discussed in this chapter was small stuff. Often a problem is caused by something simple, such as a power switch in the wrong position, a card or port not functioning (as indicated by a link light that’s not lit), or simply operator error. Even the most experienced administrator has forgotten to turn on the power, left a cable unplugged, or mistyped a username and password.
Finally, make sure that users get training for the systems they use. That may seem like an extra bother, but an hour or two of training goes a long way toward preventing problems. The number of incidents of EEOC will decline with a little user training.
Prioritize Your Problems
It is unlikely that as a network administrator or technician, you will receive problem calls one at a time. Typically, when you receive one call, you already have three people waiting for service. For this reason, you must learn to prioritize.
You start this process by asking some basic questions of the person reporting the problem so that you can determine its severity. If the current problem is minor and you have two more serious problems already facing you, your priorities are obvious.
You establish priorities to ensure that you spend your time wisely. The order in which you attempt to solve your networking problems, from highest priority to lowest, might look something like this:
Mitigating circumstances can, of course, change the order of this list. For example, if the president of the company can’t retrieve e-mail, you’d take the express elevator to their office as soon as you hang up from the call. Also, a minor, persistent problem might move up the ladder.
Remember also that some simple problems may take more effort than larger problems. You may be able to bring up a crashed server in a matter of minutes, but a user who doesn’t know how to make columns line up in Microsoft Word may take up to an hour or longer to train. The latter of these problems might get relegated toward the bottom of the list because of the time involved. It is more efficient to solve problems for a larger group of people than to fix this one user’s problem immediately.
Some network administrators list all network service requests on a chalkboard or a whiteboard. They then prioritize them based on the previously discussed criteria. Some larger companies have written support-call tracking software whose only function is to track and prioritize all network and computer problems. Use whatever method makes you comfortable, but prioritize your calls.
Check the Software Configuration
Often, network problems can be traced to software configuration (as with our DNS onfiguration example earlier in this chapter). When you are checking for software problems, don’t forget to check configuration, including the following:
Software configuration settings love to hide in places like these and can be notoriously hard to find (especially in the Registry).
Additionally, in text configuration files, look for lines that have been commented out (either intentionally or accidentally). A command such as REM or REMARK or the asterisk or semicolon characters indicate comment lines in a file.
The HOSTS file uses a # (pound sign) to indicate a comment line, as does Net-Ware’s NCF files.
Don’t Overlook Physical Conditions
As we discussed in Chapter 6, you want to make sure that from a network design standpoint, the physical environment for a server is optimized for placement, temperature, and humidity. When troubleshooting an obscure network problem, don’t forget to check the physical conditions under which the network device is operating. Check for problems such as the following:
Don’t Overlook Cable Problems
Cables, generally speaking, work fine once they are installed properly. Rarely is the cabling system the problem, unless someone has made some change to it. If you suspect that the cabling system is the problem, try replacing the patch cables at the workstation and hub first. These are easiest to get to (and replace). If that solves the problem, you know the problem was related to the patch cable. It was either faulty or the wrong type.
If the patch cable isn’t the problem, use a cable tester (not a tone generator and locator) to find the source of the problem. Wires that are moved can be prone to breaking or shorting. A short can happen when the wire conductor comes in contact with another conductive surface, changing the path of the electrical signal. The signal will go someplace else instead of to the intended recipient. You can use cable testers to test for many types of problems, including these:
As a matter of fact, cable testers are so sophisticated that they can even indicate the exact location of a cable break, accurate to within six inches or better.
Check for Viruses
Many troubleshooters overlook virus scanning because they assume that the network viruschecking software should have picked up any viruses. To be effective, it must be kept up-todate. Updates are made available almost daily. As we discussed in Chapter 9, “Fault Tolerance and Disaster Recovery,” you must run the virus definition update utility to keep the virus definition file current.
If you are having strange, unusual, irreproducible problems with a workstation, try scanning it with an up-to-date virus scan utility. You’d be surprised how many times people have spent hours and hours troubleshooting a strange problem only to run a virus scan utility, find and clean one or more viruses, and have the problem disappear.
Networking Related Tutorials
|Network Security Tutorial|
Networking Related Interview Questions
|Network Technical Support Interview Questions||Networking Interview Questions|
|CCNA Interview Questions||Network Security Interview Questions|
|Computer Network Security Interview Questions||Hardware and Networking Interview Questions|
|CCNP Interview Questions||Routing Protcol Interview Questions|
|CWNA (Certified Wireless Network Administrator) Interview Questions||Border Gateway Protocol (BGP) Interview Questions|
|Enhanced Interior Gateway Routing Protocol (EIGRP) Interview Questions||Virtual Private Network (VPN) Interview Questions|
|Controller Area Network (CAN bus) Interview Questions||Cisco Network Engineer Interview Questions|
|Storage Area Network Interview Questions||Network Troubleshooting Interview Questions|
Networking Related Practice Tests
|Network Technical Support Practice Tests||Networking Practice Tests|
|CCNA Practice Tests||Network Security Practice Tests|
|Computer Network Security Practice Tests||Hardware and Networking Practice Tests|
|CCNP Practice Tests||Routing Protcol Practice Tests|
|CWNA (Certified Wireless Network Administrator) Practice Tests||Border Gateway Protocol (BGP) Practice Tests|
|Enhanced Interior Gateway Routing Protocol (EIGRP) Practice Tests|
The Osi Model
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Fault Tolerance And Disaster Recovery
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