Chapter 21. Troubleshooting Defense Components

Bad things happen. It doesn't matter how much time and effort your team has spent researching, designing, implementing, and maintaining your network security architecture; something is going to break. That's why having a strong troubleshooting methodology is important to your success as a network security practitioner.

Troubleshooting is simply a diagnostic process that is applied to a problem to fix it. “Symptoms” are gathered to determine the cause and solution for network security problems. These symptoms usually start out at a very general level (“Why can't I connect to a server?”) and progress to more specific symptoms (“Why can I connect to other servers and not this one?”) until the root cause ...

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