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How to find loops


What do I need to search for in my packet capture to see if there are any loops in my network? I have certain rooms in my office building that do not have network connectivity, but they have PoE. The switch that they all lead back to is showing no activity lights, except for the one that is getting the internet connection from. I have changed cables, toned the wallplate port to the patch panel, and I have completely replaced the switch, with a known working one, and still cannot get network connectivity.

Any help would be greatly appreciated.