Which of the following parameters is used to elect the root bridge in STP?

The correct answer is A. Bridge ID. The Bridge ID, a combination of bridge priority and MAC address, is used to determine the root bridge in STP. The switch with the lowest Bridge ID becomes the root bridge. If bridge priorities are identical, the switch with the lowest MAC address is selected as the root bridge.

Ethernet Switching Technologies

Question

Options

ABridge ID
BSystem name of the switch
CPort ID
DRoot path cost

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(24 responses)

A
75% (18)
B
4% (1)
C
17% (4)
D
4% (1)

Explanation

The Bridge ID, a combination of bridge priority and MAC address, is used to determine the root bridge in STP. The switch with the lowest Bridge ID becomes the root bridge. If bridge priorities are identical, the switch with the lowest MAC address is selected as the root bridge.

Topics

#STP#bridge ID#root bridge#election parameter

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