Question # 1

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

Which of the following performs modulation and demodulation?

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Fiber optics

Satellite

Coaxial cable

Modern

The transmission signal coding method of TI carrier is called.

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Bipolar

NRZ

Manchester

Binary

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

Layer one of the OSI model is

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Physical layer

Link layer

Transport layer

Network layer

Which of the following is an advantage to using fiber optics data transmission.

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Resistance to data theft

Fast data transmission rate

Low noise level

All of above

The X.25 standard specifies a

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Technique for start stop data

Technique for dial access

DTE/DCE interface

None

An example of digital rather than analog communication is

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DDD

DDS

DDT

WATS

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

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

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 channel in the data communication model can be.

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Postal mail services

Telephone lines

radio lines

Any of the above

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

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100 photons

200 photons

2000 photons

300 photons

In OSI network architecture the routing is performed by

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Network layer

Data link layer

Transport layer

Session layer

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

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Session layer

Network layer

Transport layer

None

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

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VDR

RTS

CTS

DSR

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

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