Depending on the actual problem, the network administrator/operator must follow a mental flowchart that starts with the problem reported by the user, for example, an issue logging on to a system. First, make sure you go through the standard network troubleshooting process using your knowledge of the OSI reference model. If a user is on a system, and the system is up and running but the user is not able to get his credentials passed to a central server, you should try to determine whether this is a single user issue or a widespread issue, because this will dramatically . . .
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