Assuming all STP enabled switches have the same bridge priority. The MAC address of switch A is 00-e0-fc-00-00-40, the MAC address of switch B is 00-e0-fc-
00-00-10, the MAC address of switch C is 00-e0-fc-00-00-20, and the MAC address of switch D is 00-e0-fc-00-00-80.
Which switch will be elected as the root switch?
In Spanning Tree Protocol (STP), when all switches have the same bridge priority, the switch with the lowest MAC address is elected as the root switch. Among switches A, B, C, and D, switch B has the MAC address 00-e0-fc-00-00-10, which is the lowest compared to the MAC addresses of switches A (00-e0-fc-00-00-40), C (00-e0-fc-00-00-20), and D (00-e0-fc-00-00-80). Therefore, switch B will be elected as the root switch.
switch B has the least mac address so it is elected as the root switch