In today’s business-based network infrastructures, problems arise almost every second. Either the network is too slow or something is not functioning properly. At these problematic times, many administrators use a troubleshooting technique not documented in any textbook nor taught in any class nor found on any certification test. It is the skill of pure clairvoyance. I know you have all seen it, watched your senior network administrator troubleshoot a network problem without performing any analysis. The administrator closes his or her eyes, tilts back in a chair, takes a few deep breaths, and a few seconds later, produces a solution: “It’s the NIC on the server—it has to be at least five years old. Maybe the drivers need to be replaced.” ...

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