Tree or Hybrid Topology

A network topology is the physical or logical arrangement of devices. When a network is large and complex, it is rarely practical to use a single basic shape like a star or a ring. Instead, different topologies are combined to form a hybrid topology, also called a tree topology because of its hierarchical, branching structure.

In a tree or hybrid topology, there are multiple branches. Each branch can itself be a basic topology — a star, a ring, or a bus. This is not a single shape but a network of networks. Such arrangements are commonly seen in Wide Area Networks (WANs), where several Local Area Networks (LANs) are connected together. Each of those LANs might be a ring, a bus, or a star.

The textbook gives a specific example: a hybrid topology that connects four star topologies along a single bus. In this setup, data transmitted from a source device first reaches a centralised device (the hub or switch of its own star). From there, the data passes through every branch of the larger network. Each branch can have further links for more nodes, creating a hierarchy.

Key characteristics of a Tree/Hybrid Topology:

• Hierarchical structure: The network is organised in levels, with a main backbone (often a bus) and branches coming off it.
• Combination of topologies: A single network can contain star, ring, and bus segments working together.
• Centralised control at each level: Data flows from a source to a central device (like a switch or hub) within its local segment, and then to the backbone.
• Scalability: New branches or entire LANs can be added to the backbone without disrupting existing segments. …