Which one among the following devices is used for converting digital signals into analog signals and vice versa?
Modem
A router directs data packets between different networks, a switch forwards data frames within a local network based on MAC addresses, and a bridge connects and filters traffic between two network segments — none of these perform signal-format conversion.
A modem (modulator-demodulator) converts a computer's digital signals into analog form (modulation) for transmission over analog lines such as telephone cables, and converts incoming analog signals back into digital form (demodulation) for the receiving computer.
Hence, the device used for converting digital signals into analog signals and vice versa is the modem.
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