Explain the concept of root bridge.

The concept of a root bridge is related to the Spanning Tree Protocol (STP) in computer networking. In a network with multiple switches, the root bridge is the switch that is elected as the central point of the network. It acts as the reference point for all other switches in the network.

The root bridge is responsible for calculating the shortest path to all other switches in the network, ensuring that there are no loops or redundant paths. It achieves this by exchanging Bridge Protocol Data Units (BPDU) with other switches and determining the best path based on the lowest Bridge ID.

All other switches in the network determine their own paths to the root bridge, and the STP algorithm ensures that only one active path exists between any two switches. This prevents broadcast storms and network loops, ensuring a stable and efficient network topology.

In summary, the root bridge is the central switch in a network that determines the shortest path for all other switches, ensuring a loop-free and efficient network topology.