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Refer to the exhibit. The command: show spanning-tree brief
is issued on every Switch on the network.
** Which device will likely be the spanning tree root bridge?**
Switch SW2
Switch SW1
Switch SW3
Switch SW4
The exhibit shows the information of the Bridge ID of each switch (Priority and MAC address). The bridge ID is used to elect the root bridge and to determine the root port of each non-root bridge in a STP domain. The Bridge ID is 8 bytes long and consists of priority and MAC address. To find the root bridge in a STP domain each device combines the priority with the MAC address. The Bridge ID with the lowest ID becomes the root bridge. The priority by default is 32,768 or can be manually set to another value. The Bridge ID with the lowest priority becomes the Root Bridge, if there is a tie then the MAC address will become the tiebreaker. The bridge ID with lowest numerical MAC address will become the root bridge. In this case switch SW2 has the lowest priority value, so it will become the Root Bridge.
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