How STP Elects Root Bridge with Hello BPDU? 

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U should do the boson practice exams too. i like sunny too

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Lowest cost and lowest priority are two different things.

I THINK I've got it figured out. The root bridge is decided arbitarily but definitively without regard to the proximity of the source or destination device. Then duplicate routes which could cause loops are shutdown as alternates. If the root bridge (bridge being an antiquated term for switch) proves to be suboptimal on a long-term basis (and NOT simply because of the proximity of the end devices involved in a particular transmission) then the switches can be manually configured to produce a more optimal root bridge for long-term operations ...I think. The concept of route cost is NOT related to one particular transmission but rather to establishing a somewhat arbitary system long-term system which on occasion may prove less than optimal in particular instances but overall is fixed and works well MOST of the time. The concept of cost is just used to make the somewhat arbitary system somewhat efficient and clearly defined.

It doesn't work with unmanaged switches.