What happens if someone connects a PoE supplier device in my network? What happens if someone connects a PoE supplier device in my network (In a single switch port)? Does it mean all my network will offer PoE? Is it possible to detect a PoE supplier in you network?

You will not have PoE over your network in that case, the switch does not "redistribute" power to the other ports. If you want PoE, you need either:

* One PoE injector for each device that require PoE (the injector is plugged between the switch and the device)
* A switch that does PoE, in that case, every device connected to this switch will be able to have PoE (or not, you can configure it)



If your switch support PoE this means it is able to power devices, but you might have to configure it, and in that case, there is no need for an additional injector.