Question # 1

Which of the following transmission system provide the highest data rate to in individual device.

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Computer bus

Telephone lines

Voice and mode

Lease lines

The channel in the data communication model can be.

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Postal mail services

Telephone lines

radio lines

Any of the above

Communication circuits that transmit data in both directions but not a the same time are operating in

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A simplex mode

A half duplex mode

A full duplex mode

An asynchronous mode

An example of an analog communication method is.

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Laser beam

Micro wave

Voice grade telephone line

All of the above

Which of the following is considered a broad band communication channel.

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Coaxial cable

Fiber optics cable

Microwave circuits

All of above

An example of digital rather than analog communication is

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DDD

DDS

DDT

WATS

What is the number of separate protocol layers at the steric interface gateway specified by the X.25 standard.

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2

3

4

6

Which of the following is required to communicate between two computers.

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Communications software

Protocol

Communication Hardware

All of above including access to transmission medium

In communication satellite multiple repeaters are known as

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Detector

Modulator

Stations

Transponders

In a synchronous modem the receive equalizer is known as

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Adaptive equalizer

Impairment equalizer

Statistical equalizer

Compromise equalizer

The interactive transmission of data with in a time sharing system may be best suited to.

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Simplex lines

Half duplex lines

full duplex lines

Biflex lines

Avalanche photodiode receivers can detect bits of transmitted data by receiving.

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100 photons

200 photons

2000 photons

300 photons

Which of the following communication modes support two way traffic but in only one direction at a time.

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Simplex

Half duplex

Three quarters duplex

All of the above

In OSI network architecture the routing is performed by

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Network layer

Data link layer

Transport layer

Session layer

Which of the following performs modulation and demodulation?

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Fiber optics

Satellite

Coaxial cable

Modern

Data communications monitors available on the software marked include.

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ENVIRON/1

TOTAL

BPL

Telnet

the loss in signal power as light travels donw the fiber is called.

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Attenuation

Progragation

scathering

Interruption

A data terminal serves as an

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Effector

Sensor

Both a and b

Neither a nor b

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