Question # 1

The channel in the data communication model can be.

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Postal mail services

Telephone lines

radio lines

Any of the above

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

the transmission signal coding method of TI carrier is called

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Bipolar

NRZ

Binary

Manchester

While transmitting odd panty coded symbols the number of zeros in each symbol is.

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Odd

Even

a and b both

Un known

A data terminal serves as an

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Effector

Sensor

Both a and b

Neither a nor b

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

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

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

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Two

Three

Seven

Six

Data communications monitors available on the software marked include.

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ENVIRON/1

TOTAL

BPL

Telnet

In a synchronous modem the receive equalizer is known as

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Adaptive equalizer

Impairment equalizer

Statistical equalizer

Compromise equalizer

Which of the following performs modulation and demodulation?

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Fiber optics

Satellite

Coaxial cable

Modern

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

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 signal is not standard RS-232 -C signal

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VDR

RTS

CTS

DSR

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 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

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