Computer Networks

 What is the minimum number of wires needed to send data over it serial communication link layer?

• 1

• 2

• 3

• 4

 The interactive transmission of data within a time sharing system may be best suited to

• simplex line

•  half duplex lines

• full duplex line

• bi-flex lines

The amount of uncertainty in a system of the symbol is called

• bandwidth

• entropy

• loss

• quantum

The transmission signal coding method for T1, the carrier is called

• NRZ

• Bipolar

• Manchester

• Binary

In a synchronous modem, the digital-to-analog converter sends a signal to the

• transmission line

• modulator

• terminal

• equalizer

Which section of a synchronous modem contains the scrambler?

•  Terminal section

• Receiver section

• Control section

• Transmission section

The receive equalizer reduces delay distortions using a

• difference engine

• tapped delay lines

• descrambler

• gear shift

How much power (approximately) a light-emitting diode can couple into an optical fiber?

• 1 picowatt

• 100 microwatts

• 10 milliwatts

• 10 watts

Avalanche photodiode receiver can detect bits of transmitted data by receiving

• 1 Photon

• 100 photons

• 10 photons

•  200 photons

The loss in signal power as light travels down the fiber is called

• propagation

• attenuation

• scattering

• absorption