Refer to the exhibit.
Why has this switch not been elected the root bridge for VLAN1?
A.
It has more than one interface that is connected to the root network segment.
B.
It is running RSTP while the elected root bridge is running 802.1d spanning tree.
C.
It has a higher MAC address than the elected root bridge.
D.
It has a higher bridge ID than the elected root bridge.
Explanation:
The root bridge is determined by the lowest bridge ID, and this switch has a bridge ID priority of
32768, which is higher than the roots priority of 20481.
I think this is not the right answer.. the switch with lowest priority must be the root bridge.
I think the right answer is A.
The question is why is this bridge NOT the root bridge.. A makes no sense for what the question is asking. You are looking at a switch that is not the root bridge.. so why is it not the root bridge? Because it’s priority is lower! The answer is D.