A network is set up with a single communication line where all devices share the same transmission medium. Which topology does this describe?

In a star topology, all devices connect individually to a central hub or switch. Each device communicates through this central point, which means they do not share a single communication line. This structure makes star topology more reliable and easier to manage compared to bus topology, as one device failure does not affect the rest of the network.

Tree topology is a hybrid of star and bus topologies, featuring a hierarchical structure. It combines multiple star topologies connected to a central bus, allowing for branching connections. While it offers scalability and flexibility, it does not define a single communication line shared by all devices, which is essential in a bus topology.

Hybrid topology combines different types of topologies, such as star, bus, and ring, into one network. Although it can incorporate bus elements, the defining feature of a hybrid network is the mix of various topologies, which makes it unsuitable for describing a network solely based on a single communication line.