Q. Now-a-days computers all over the world can talk to each other. Which is one of the special accessories essential for this purpose?

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Q. Devices on one network can communicate with devices on another network via a

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Q. What is the name of the device that connects two computers by means of a telephone line?

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Q. The _____ layer is the layer closest to the transmission medium.

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Q. Which of the following allows devices on one network to communicate with devices on another network?

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Q. RS-449/442-A/423-A is

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Q. A form of modulation In which the amplitude of a carrier wave is varied in accordance with some characteristic of the modulating signal, is known as

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Q. A modulator converts a _____ signal to a(n) _____ signal.

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Q. Repeaters are often used on an 802.3 network to help strengthen the signals being transmitted. As with the length of segments and the number of segments, a limit exists as to how many repeaters can be used between any two nodes. What is the maximum number of repeaters that can be used?

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Q. A modem that is attached to the telephone system by jamming the phone's handset into two flexible receptacles in the coupler?

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Q. Which of the following statements is correct?

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Q. A modem is connected in between a telephone line and a

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Q. A smart modem can dial, hang up and answer incoming calls automatically. Can you tell who provides the appropriate instruction to the modem for this purpose?

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Q. In a synchronous modem, the digital-to-analog converter transmits signal to the

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Q. Which of the following connectivity devices is used to extend a network on a purely mechanical basis?

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Q. Who invented the modem?

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Q. Propagation time is equals to

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Q. Period is the inverse of

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Q. The black and white TV is an example of

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Q. The level of the signal is inversely proportional to the

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