Question # 1

Which of the following is not a transmission medium.

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Telephone lines

Coaxial cables

Modem

Micro wave systems

Terminal are required for

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Real time batch processing and time sharing.

Real time time sharing and distributed message processing.

Real time distributed processing and manager inuiry

Real time time sharing and message switching

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

In OSI network architecture the dialogue control and toke management are responsibility of

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Session layer

Network layer

Transport layer

None

The transmission signal coding method of TI carrier is called.

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Bipolar

NRZ

Manchester

Binary

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

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Attenuation

Progragation

scathering

Interruption

In communication satellite multiple repeaters are known as

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Detector

Modulator

Stations

Transponders

Which of the following performs modulation and demodulation?

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Fiber optics

Satellite

Coaxial cable

Modern

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

Layer one of the OSI model is

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Physical layer

Link layer

Transport layer

Network layer

Which of the following might be used by a company to satisfy its growing communications needs.

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Front and processor

Multiplexer

Controller

All of the above

Number of bits per symbol used in biodot code is.

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5

7

8

9

How many OSI layers are covered in the X-25 standart.

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Two

Three

Seven

Six

the transmission signal coding method of TI carrier is called

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Bipolar

NRZ

Binary

Manchester

The receive equalizer reduces delay distortions using a

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Tapped delay lines

Gearshift

Descrambler

Difference engine

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

The X.25 standard specifies a

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Technique for start stop data

Technique for dial access

DTE/DCE interface

None

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