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Sams Teach Yourself Network Troubleshooting in 24 Hours, Second Edition by Jonathan Feldman

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Hour 21. Protocol Analyzers

All are lunatics, but he who can analyze his delusion is called a philosopher.

——Ambrose Bierce

Tell me about your network….

Many network troubleshooting cases that you’ll encounter will be “elementary, my dear Watson,” that is, solvable by deductive reasoning alone. However, to solve the most hard-boiled network crimes, you’ll need to get a wiretap to give you the hard data that you need. Protocol analyzers provide a type of “wiretap” that allows you to gather objective data about a networking problem.

Like a wiretap, protocol analyzers shouldn’t be used indiscriminately; you definitely want to use your noodle before you use your analyzer. You should always formulate a theory before breaking out the analyzer—otherwise, ...

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