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

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.

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

  1. jay z says:

    We must find which switch has designated port that connected to Printers using Hub.

    Both switches has default Bridge Priority of 32768. Second Switch3 MAC address (0010.7bcc.733a) is lower than Switch4 MAC address (0010.7bcc.7347).

    Then Switch3’s interface will be play a role of designated port.

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