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Which switch provides the spanning-tree designated port role for the network segment that services the printer

Refer to the exhibit

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

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A.
Switch1

B.
Switch2

C.
Switch3

D.
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.
Designated port is a port that is in the forwarding state. All ports of the root bridge are designated
ports.
Switch 3 and Switch 4 has same priority so it will see on lowest MAC address and here switch 3
has lowest MAC address. So switch 3 segment will play a Designated port role.
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.

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