"All Ports should go into forwarding state immediately" I would take this to mean everything, including trunks between switches, and disabled ports but the solution indicates that this is not what is desired.
"Prevent any switch from being added to the network at the edge and becoming root" Edge of what? It looks like the edge of 7018, and this makes sense since it is the "provider network", but is still open to interpretation. I am being a whiny bitch here, but sans proctors, I think this could be a little clearer :)
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