CompTIA ITF+ Practice Test 2026 - Free CompTIA ITF+ Practice Questions and Study Guide

Question: 1 / 400

Which device converts digital signals to analog signals and vice versa for communication over telephone lines?

Router

Modem

The device that converts digital signals to analog signals and vice versa for communication over telephone lines is the modem. A modem, short for modulator-demodulator, is essential for enabling computers to communicate over telephone lines. When a digital signal from a computer is sent through a modem, it modulates that signal into an analog format suitable for transmission over traditional copper telephone lines. Conversely, when an analog signal is received, the modem demodulates it back into digital form so that the computer can process it.

Modems play a crucial role in connecting devices to the internet via telephone infrastructure, especially in areas where high-speed broadband is not available. This function allows for seamless communication by bridging the gap between digital data generated by computers and the analog signals used in traditional telephony.

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