Question # 1

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

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VDR

RTS

CTS

DSR

An example of digital rather than analog communication is

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DDD

DDS

DDT

WATS

In OSI network architecture the routing is performed by

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Network layer

Data link layer

Transport layer

Session 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

In a synchronous modem the receive equalizer is known as

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Adaptive equalizer

Impairment equalizer

Statistical equalizer

Compromise equalizer

The X.25 standard specifies a

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Technique for start stop data

Technique for dial access

DTE/DCE interface

None

The transmission signal coding method of TI carrier is called.

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Bipolar

NRZ

Manchester

Binary

Which of the following is not a transmission medium.

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Telephone lines

Coaxial cables

Modem

Micro wave systems

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

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

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

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Attenuation

Progragation

scathering

Interruption

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 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 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

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

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 is considered a broad band communication channel.

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Coaxial cable

Fiber optics cable

Microwave circuits

All of above

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