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Refer to the exhibit. Each of these four switches has been configured with a hostname, as well as being configured to run RSTP. No other configuration changes have been made. Which three of these show the correct RSTP port roles for the indicated switches and interfaces? (Choose three.)
Correct Answer: A,B,F
Explanation/Reference: Switch C, with the same default priority as all the switches and with the lowest MAC address, is the root switch. Both of its ports are designated. The closest Switch A port (fa0/1) is the root port (B) and its other port is designated (A). Switch D's gi0/2 port is its root port (F) and the gi0/1 port is designated. Switch B has to find the lowest path back to the root switch and this is through Switch A (it has a lower MAC address and hence lower bridge-id). So, Switch B's gi0/2 port is the root port, and gi0/1 is blocked.