Which switch would STP choose to become the root bridge in the selection process?
Click on the arrows to vote for the correct answerA. B. C. D.
In the Spanning Tree Protocol (STP), switches elect a root bridge to maintain a loop-free topology in the network. The switch with the lowest Bridge ID becomes the root bridge.
A Bridge ID is made up of two components: the Bridge Priority value (default value 32768) and the MAC address of the switch. The Bridge Priority value is a configurable value that can be set in increments of 4096 (from 0 to 61440).
In the given options, the Bridge Priority value is the same for both switches, which means that the MAC address will determine the root bridge. The MAC address is a 48-bit value that is unique to each switch.
Let's compare the MAC addresses of the switches:
A. 32768: 11-22-33-44-55-66 B. 32768: 22-33-44-55-66-77 C. 32769: 11-22-33-44-55-65 D. 32769: 22-33-44-55-66-78
Switch A has the lowest MAC address, so if it has the lowest Bridge Priority value (32768), it will become the root bridge. Switch B has a higher MAC address than A, so it cannot become the root bridge.
Switch C has the same MAC address as A, but a higher Bridge Priority value (32769), so it cannot become the root bridge.
Switch D has a higher MAC address than A and a higher Bridge Priority value than C, so it cannot become the root bridge either.
Therefore, the answer is A. 32768: 11-22-33-44-55-66.