A modem is a device that allows a computer to transmit and receive information over a standard telephone line by doing what?

A modem is a device that allows a computer to transmit and receive information over a standard telephone line by doing what?

• A. Converting digital signals to analog and vice versa
• B. Storing data on a hard drive
• C. Encrypting data for secure transmission
• D. Providing direct satellite communication

Answer: (A)

Modems bridge digital computers and analog telephone networks by translating between digital data and analog signals. A computer sends digital bits, but a standard phone line carries analog audio. The modem modulates the digital data into an analog signal that can travel over the line, then demodulates incoming analog signals back into digital data for the computer to use. This back-and-forth is exactly what the device is named for. The other options don’t fit the core role: storing data happens on storage devices, encryption is a separate security function, and satellite communication uses a different medium than a regular telephone line.

Modems bridge digital computers and analog telephone networks by translating between digital data and analog signals. A computer sends digital bits, but a standard phone line carries analog audio. The modem modulates the digital data into an analog signal that can travel over the line, then demodulates incoming analog signals back into digital data for the computer to use. This back-and-forth is exactly what the device is named for. The other options don’t fit the core role: storing data happens on storage devices, encryption is a separate security function, and satellite communication uses a different medium than a regular telephone line.