Which device acts as a common termination point that relays signals in a network?

The choice of hub as the answer highlights its role as a common termination point in a network. A hub is a networking device that connects multiple Ethernet devices, making them act as a single network segment. When data packets are received by the hub, it broadcasts the packets to all connected devices regardless of the intended recipient, allowing them to receive the same information.

This device operates at the physical layer of the OSI model and plays a fundamental role in smaller networks or in environments where connectivity is essential but traffic management is not a priority. Due to its simplistic operation, it does not provide any data processing or intelligence, which distinguishes it from more advanced devices like switches and routers.

In contrast, switches create a more efficient network by directing data specifically to the intended device rather than broadcasting it everywhere. While routers connect different networks and perform routing functions, and modems facilitate internet connectivity by modulating signals, the defining characteristic of a hub is its role in acting as a shared connection point for all devices in its network segment.