Question # 1

Which of the following is not a transmission medium.

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Telephone lines

Coaxial cables

Modem

Micro wave systems

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

Binary

Manchester

In communication satellite multiple repeaters are known as

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Detector

Modulator

Stations

Transponders

The receive equalizer reduces delay distortions using a

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Tapped delay lines

Gearshift

Descrambler

Difference engine

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

The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as.

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Modulation

Demodulation

Synchronizing

Digitising

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

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Two

Three

Seven

Six

Layer one of the OSI model is

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Physical layer

Link layer

Transport layer

Network layer

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

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VDR

RTS

CTS

DSR

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

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100 photons

200 photons

2000 photons

300 photons

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

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

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

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Attenuation

Progragation

scathering

Interruption

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

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

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

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

Data communications monitors available on the software marked include.

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ENVIRON/1

TOTAL

BPL

Telnet

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

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