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Alternatively referred to as a star bus topology, tree topology is one of the most common network setups that is similar to a bus topology and a star topology.
The Spanning Tree Protocol (STP) is a Layer 2 protocol that prevents loops in transparently bridged networks. Due to the nature of transparent bridging, when an active looped topology exists, a network meltdown generally occurs in a matter seconds.he root bridge is the heart of the spanning-tree topology, and is used as a reference point to generate a loop-free topology. Once the root bridge is selected, each bridge determines the best path to reach the root bridge and blocks any other paths that introduce loops.