In an 802.1D Spanning Tree Protocol (STP) topology, which characteristic is evaluated first to determine which switch becomes the root bridge for a given VLAN?
Highest MAC address
Highest bridge-priority value
Lowest port ID
Lowest bridge-priority value
STP uses each switch's Bridge ID (BID) to elect the root bridge. The BID combines a 16-bit bridge-priority value with the switch's MAC address. The switch with the lowest numerical bridge-priority value wins the election. Only if two or more switches share the same priority does STP compare their MAC addresses, selecting the switch with the lowest MAC as the root. Therefore, the lowest bridge-priority value is the primary deciding factor, while the other attributes serve only as tiebreakers.
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