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

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Summary

Many network problems are the result of human-initiated change. Finding the change can involve inspecting documentation and communicating with co-workers and outside vendors. Even unintended changes because of the “fat finger factor” can seriously damage a network, so it’s worth considering where you’ve been, no matter how unrelated it might seem. You’ll also want to figure out where others have been; however, don’t rely solely on logbooks. (Although to document is divine, people aren’t perfect. They’ll sometimes forget to write down what they’ve done.) Vendors, including VARs, ISPs, or the telephone company can be problematic because there is no direct profit motive in being good at communicating change before it happens.

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