Sams Teach Yourself Network Troubleshooting in 24 Hours by Jonathan Feldman

By Jonathan Feldman

A pragmatic, hands-on quide to community troubleshooting that emphasizes diagnostic thoughts that either execs and part-time community adminstrators can comprehend and use of their daily actions. In trendy pervasive community surroundings, lots of those everyone is usually accountable for solving a community if it is going down. This e-book emphasizes solving functional networking purposes like shared printers, utilizing the web, and sharing documents. It doesn't get into the specifics of protocols or particular purposes, yet offers brief, concise overviews of subject matters like instant networking, Unix, home windows 2000, Novell Netware, routers, and firewalls.

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Related? Couldn’t be! Has to be the NT configuration, right? It can’t be the server. However, when this scenario happened to me recently, it was, in fact, the server. This is what I call the fat finger factor—while editing any configuration file (no matter how benign your changes are), you might introduce a stray character or two that makes a key command or parameter unintelligible to the server. In my case, the problem was that I had edited the IntranetWare startup file for something quite innocuous and hit a random key by accident at the top of the file.

A good troubleshooter will make it a point to label each device clearly and concisely before trouble strikes; a lack of labeling can really increase your downtime by a remarkable margin. S. North Carolina or a similar World War II battleship, you’ll marvel at all the hoses and pipes that are running throughout the ship—particularly in the machine rooms. Take a look at the meticulous way all these pipes are labeled; believe me, they didn’t do this for fun. They needed to know which pipe was air, steam, fresh water, brine, gas, or oil—a delay in a repair could literally sink the ship.

Usually, because these are shared networks (or “party lines”), the trouble is that somebody is babbling incessantly and not letting anybody else talk (see the Ethernet and Token-Ring hours for specifics). All sorts of fancy new technologies are built into “smart hubs” to detect this and stop it; therefore, this sort of problem isn’t as common today. You’ll still see one workstation bring an entire segment down sometimes if you’re not totally using switches on your network, because even smart hubs are not as smart as you are (nor are they as smart as manufacturers like to think they are).

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