Then, for those of you interested in STP, I’ll pose this question: how many ways can you think of to configure the two switches to achieve a particular flow of packets between two devices?

Should I just enable STP on all and add the second uplink from B to Switch C, or uplink B to one of the other switches to form a 'ring'? Some other info: ...

The purpose of STP is to prevent loops between switches, not loops on an individual switch, although it may help a little with loops on an individual switch. 4.