Which device converts data received from your Internet Service Provider into a digital signal?

The device that converts data received from your Internet Service Provider into a digital signal is a modem. A modem, short for modulator-demodulator, is specifically designed to translate digital data from a computer into analog signals that can be transmitted over telephone lines or cable systems. Conversely, it also demodulates incoming analog signals from the ISP, converting them back into digital data that your devices can understand.

In a typical setup, when you connect to the internet, the modem acts as the bridge between your local network and the larger internet. It receives the signal from your ISP and processes it to ensure that your devices can communicate over the internet. This is crucial because most internet connections rely on different types of transmission mediums, such as DSL, cable, and fiber optics, all of which require this conversion to facilitate effective data transfer.

Other devices listed, such as a router, switch, and hub, serve different roles in a network configuration. Routers primarily direct traffic between different networks, while switches connect multiple devices within the same network, and hubs are simpler devices used to connect Ethernet devices. Hence, while all of these devices contribute to networking, the modem's unique function in signal conversion is what makes it the correct answer for this question.