What type of topology is characterized by each device being connected to a central hub?

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In a topology where each device is connected to a central hub, the arrangement is known as a star topology. This design allows all devices, or nodes, to communicate with one another through the central hub. The hub acts as a repeater for the data flow, meaning that when one device sends data to another, it first goes to the hub, which then forwards it to the appropriate device.

The star topology is advantageous because if one connection or device fails, it does not affect the other devices in the network. This leads to more reliable communication compared to other topologies. Additionally, adding or removing devices is simpler in a star topology, as it only involves connecting or disconnecting from the hub without disrupting the existing network.

In contrast, bus topology connects all devices along a single communication line or cable, which can lead to issues if the main cable fails. Ring topology connects each device in a circular arrangement, with data traveling in one direction, which can also face connectivity issues if one device fails. Lastly, mesh topology has devices interconnected with many redundant connections, providing reliability but requiring more cabling and complexity in setup. Therefore, the star topology is characterized by its central hub configuration, making it the correct answer.