Refer to the exhibit. Which switch provides the spanning-tree designated port role for the network segment that services the printers?

Question:
Refer to the exhibit. Which switch provides the spanning-tree designated port role for the network segment that services the printers?

• Switch1
• Switch2
• Switch3
• Switch4

Explanation: First, the question asks what switch services the printers, so it can be Switch 3 or Switch 4 which is connected directly to the Printers.

Next, by comparing the MAC address of Switch 3 and Switch 4 we found that the MAC of Switch 3 is smaller. Therefore the interface connected to the Printers of Switch 3 will become designated interface and the interface of Switch 4 will be blocked. The picture below shows the roles of all ports:

DP: Designated Port
RP: Root Port
BP: Blocked Port

(Please notice that Switch 1 will become the root bridge because of its lowest priority, not Switch 3)

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