A modulator/demodulator device connects devices and converts computer signals to/from audio signals. What is this device?

• A. Modem
• B. MT-RJ Connector Fiber
• C. MAC Address
• D. Mesh Physical Topology

Answer: (A)

A modem is a device that translates between digital computer signals and analog audio signals, allowing data to be transmitted over voice-grade media and then reassembled back into digital data at the other end. It literally performs modulation of digital data into analog tones for transmission and demodulation of incoming analog tones into digital data. The other options don’t fit: a MT-RJ connector fiber is just a fiber optic connector, a MAC address is a hardware identifier, and Mesh Physical Topology describes how devices are laid out and connected—not a signal-converting device. So the described device is a modem.