While I understand SPT in general, I can't seem to figure out why the solution 
guide says to change SPT cost on Cat3, port Po34, from 12 to 5:

int po34
 spanning-tree cost 5

Cat3 is the root, so calculation from Cat2 would only take cumulative cost of 
the outgoing interfaces (cat2 interface po24 + cat4 interface po34).
If we were to change the cost to manipulate, shouldn't we reduce the spantree 
cost on Cat4's interface po34, instead of that on Cat2?

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