Which network topology is least likely to be used due to its expense?

The mesh network topology is generally considered the least likely to be used due to its expense. In a mesh network, every device is connected to every other device, which provides high redundancy and reliability but significantly increases the amount of cabling required and the complexity of the setup. This extensive interconnection makes the initial installation and maintenance costs considerably higher compared to other topologies.

The expense is largely attributed to the additional hardware needed for multiple connections and the increased labor intensity of setting up such a system. While it offers advantages such as fault tolerance and improved performance in data-heavy environments, these benefits often do not outweigh the costs for many organizations, especially when simpler and more cost-effective options are available.

Other network topologies, like star, bus, and ring, utilize less cabling or fewer connections between devices, making them more economical for general use. Star topologies, for example, connect all devices to a central hub, improving manageability and reducing infrastructure costs, while bus and ring topologies are typically less complex and cheaper to implement, particularly in smaller networks.