In a network with dozens of switches, how many root bridges would you have?

In a network utilizing the Spanning Tree Protocol (STP), there is only one root bridge per spanning tree instance. The root bridge serves as the central point for all spanning tree calculations, ensuring that loops are prevented in the network topology. It is elected based on the bridge ID, which consists of the priority value and the MAC address of the bridges. Since the goal of STP is to maintain a loop-free topology, having multiple root bridges could create inefficiencies and management complexities, as each instance of STP operates with a single root bridge for decision-making purposes.

Thus, in a network with dozens of switches, you would typically have one root bridge that coordinates the overall switching environment. This simplifies the management of the network and maintains stability in the topology, allowing for efficient traffic flow.