Which device is typically used to amplify signals in a network?

The device used to amplify signals in a network is the repeater. A repeater functions by receiving a signal and then regenerating and retransmitting it to extend the transmission distance. This is particularly useful in networks where distances between devices might exceed the limitations of standard communication media, such as Ethernet cables or wireless signals. By amplifying the original signal, a repeater helps in overcoming issues related to signal degradation and loss of data integrity over long distances.

Hubs, although they can connect multiple devices in a network, do not specifically amplify signals; they simply retransmit incoming signals to all ports. Switches are more intelligent devices that manage data traffic efficiently by directing packets to specific devices rather than broadcasting to all, but they also don't amplify signals. Routers facilitate communication between different networks and manage traffic, but they do not serve the primary function of signal amplification. Thus, in the context of signal amplification, the repeater is the most appropriate answer.