Which device is used to connect a computer to a telephone line for dial-up internet access?

This question focuses on the specific device used to bridge the gap between a computer's digital signals and an analog telephone line for dial-up internet.

• Modem is the correct answer. A modem (short for MOdulator-DEModulator) is essential for dial-up connections. It converts the digital signals from your computer into analog signals that can be transmitted over a telephone line (modulation) and converts incoming analog signals back into digital signals for the computer to understand (demodulation).
• Router is incorrect. A router connects multiple networks and typically works with broadband internet connections (like DSL or cable), distributing network access to multiple devices. It does not directly connect to a telephone line for dial-up.
• Switch is incorrect. A switch is a networking device that connects multiple devices within a local area network (LAN), allowing them to communicate with each other. It does not handle the conversion for telephone lines.
• Repeater is incorrect. A repeater is used to extend the range of a network signal by regenerating it, but it does not perform the digital-to-analog conversion required for dial-up internet over telephone lines.

The modem's unique modulation/demodulation function is critical for dial-up internet.