What device is responsible for amplifying signals in a network?

The device that amplifies signals in a network is the repeater. A repeater's primary function is to receive incoming signals, amplify them, and then transmit them again, extending the reach of the network. This is particularly useful in situations where the signal may weaken due to distance or physical obstructions. By boosting the signal strength, a repeater helps maintain reliable communication across a broader area, which is crucial in larger networks or setups where signal degradation may occur.

In contrast, a router directs data packets between different networks, managing traffic and ensuring data is sent to the correct destination, but does not amplify signals. A switch operates within a network to connect devices, forwarding data based on MAC addresses without modifying or amplifying the signals. An access point allows wireless devices to connect to a wired network but does not inherently boost signal strength. Therefore, the repeater is the only device specifically designed to amplify signals, making it the correct choice.