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MCQ

The packets switching concept was first proposed

in the late 1980s for the Defense Ministry of US.

in the early 1960s for military communication systems, mainly to handle speech

in the late 1950s for Defense Ministry of US

All of the above

None of the above

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A decrease in magnitude of current, voltage, a power of a signal in transmission between points, is known as

Attenuation

Amplitude

Aloha

Carrier

None of the above

Discussion

MCQ

Carrier is

One or more conductors that serve as a common connection for a related group of devices

a continuous frequency capable of being modulated or impressed with a second signal

the condition when two or more sections attempt to use the same channel at the same time

a collection of interconnected functional units that provides a data communications service among stations attached to the network

None of the above

Discussion

MCQ

Which of the following medium access control technique is used for bus/tree?

token ring

token bus

CSMA

MAC

None of the above

Discussion

MCQ

The probability that a single bit will be in error on a typical public telephone line using 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal to

0.003

0.009

0.991

0.999

None of the above

Discussion

MCQ

Which of the following items is not used in Local Area Networks (LANs)?

Computer

Modem

Printer

Cable

None of the above

Discussion

Banking

Engineering

General

Medical

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History and Generations

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Digital Logic Gate

Number System

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