Fix the example of the MST of a network #204
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I think the port that will be blocked in the example is port 1 of Switch 4, and port 2 will be the root. (Link to the figure)
The MST will be the line Switch1-Switch9-Switch4, since Switch4 prefers to pass through Switch9 to reach Switch1, for a total cost of 2, instead of going directly to Switch1 for a cost of 3.