|  | 5.6 | Basic Topologies Used in Networking
| 5.6.7 | Tree network topology
Mathematical Perspective The tree topology is similar to the extended star topology, the primary difference is that it does not use one central node. Instead, it uses a trunk node from which it, then, branches to other nodes. There are two types of tree topologies: the binary tree (each node splits into two links); and the backbone tree (a backbone trunk has branch nodes with links hanging from it). Physical Perspective The trunk is a wire that has several layers of branches. Logical Perspective The flow of information is hierarchical.