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Which of the following are used to link PCs?

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Which of the following are used to link PCs?

(a) modem cable

(b) null modem cable

(c) serial port

(d) parallel port

The question was asked in homework.

I'd like to ask this question from Asynchronous Flow Control topic in division Basic Peripherals of Embedded Systems

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Correct choice is (b) null modem cable

Easy explanation: The modem cables are used to link PC with other peripherals like printers, plotters, modems etc. But it cannot link with other PCs. So an alternative method is adopted to link PCs which is called null modem cable.

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