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Refer to the exhibit. Which Switch provides the spanning tree designated port that supplies service to PC1?
Switch SW7
Switch SW2
Switch SW3
Switch SW1
The only two switches that service PC1 are either Switch SW7 or Switch SW3, which use HUB2 to connect PC1. The question asks for the designated port, which is the port that is forwarding traffic to PC1. Switch SW3 and Switch SW7 have the same priority however they have different MAC address. The lowest numerical MAC address will be the tiebreaker to decide which port is the designated and which is one is the blocking state. Switch SW3 has the lowest MAC address, therefore port f1/2 will remain as designated and the port f0/0 in Switch SW7 will be in the discarding role or blocking state.
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