Question # 1

The X.25 standard specifies a

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Technique for start stop data

Technique for dial access

DTE/DCE interface

None

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

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Session layer

Network layer

Transport layer

None

An example of digital rather than analog communication is

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DDD

DDS

DDT

WATS

Which of the following signal is not standard RS-232 -C signal

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VDR

RTS

CTS

DSR

Data communications monitors available on the software marked include.

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ENVIRON/1

TOTAL

BPL

Telnet

the transmission signal coding method of TI carrier is called

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Bipolar

NRZ

Binary

Manchester

Layer one of the OSI model is

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Physical layer

Link layer

Transport layer

Network layer

A protocol is a set of rules governing a time sequence of events that must take place.

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Between peers

Between an interface

Between moderns

Across an interface

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

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 is not a transmission medium.

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Telephone lines

Coaxial cables

Modem

Micro wave systems

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

A data terminal serves as an

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Effector

Sensor

Both a and b

Neither a nor b

What is the main difference between DDCMP and SDLC.

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DDCMP does not need spectral hardware to final the beginning of a message

DDCMP has a message header

SDLC has a IP address

SDLC does not use CRC

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

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Attenuation

Progragation

scathering

Interruption

Number of bits per symbol used in biodot code is.

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5

7

8

9

The channel in the data communication model can be.

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Postal mail services

Telephone lines

radio lines

Any of the above

In communication satellite multiple repeaters are known as

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Detector

Modulator

Stations

Transponders

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

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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