Data Communication

Contents

Data Communication CS – 601

Question No: 1 ( Marks: 1 ) – Please choose one

  • Effective network mean that the network has fast delivery, timeliness and high bandwidth
  • duplex transmission
  • accurate transmission
  • low bandwidth

Question No: 2 ( Marks: 1 ) – Please choose

A set of devices connected by communication links is called networking

  • True
  • False

Question No: 3 ( Marks: 1 ) – Please choose one

Which one best describes the given statement:

  • “To allow multiple users to share total capacity of a transmission medium” congestion control
  • exchange management

·         multiplexing

Question No: 4 ( Marks: 1 ) – Please choose one

Line configuration refers to the way two or more devices attach to a

  • Link
  • Circuit Route
  • Node

Question No: 5 ( Marks: 1 ) – Please choose one

Requires the maximum number of I/O ports.

  • Star
  • Bus
  • Mesh
  • Ring

Question No: 6 ( Marks: 1 ) – Please choose one

is used to define the direction of the signal flow between the linked devices.

  • transmission mode
  • transmission method
  • transmission impairments

Question No: 7 ( Marks: 1 ) – Please choose one

Unidirectional traffic movement is overcome by dual ring technology.

  • True
  • False

Question No: 8 ( Marks: 1 ) – Please choose one

Trailer is only added at layer of OSI model.

  • Data link
  • Physical
  • Network
  • Application

Question No: 9 ( Marks: 1 ) – Please choose one

Data link layer deals with mechanical and electrical specifications of transmission medium and interface

  • True
  • False

Question No: 10 ( Marks: 1 ) – Please choose one

A signal that repeats a pattern over a regular interval of time is called

  • periodic signal
  • analog signal
  • composite signal

Question No: 11( Marks: 1 ) – Please choose one

If there is in voltage then the frequency is infinite.

  • instantaneous change
  • continuous change
  • no change

Question No: 12 ( Marks: 1 ) – Please choose one

In a time-domain plot, the horizontal axis is measure of

  • signal
  • amplitude
  • frequency
  • Phase
  • Time

Question No:13 ( Marks: 1 ) – Please choose

DC component is also termed as Direct current component or a component with non-zero frequency.

  • True
  • False

Question No: 14 ( Marks: 1 ) – Please choose one

Quantization means measuring amplitudes of signal at equal intervals.

  • True
  • False

Question No: 15 ( Marks: 1 ) – Please choose one

Amplitude in ASK is more resistive to EMI and Noise.

  • True
  • False

Question No: 16 ( Marks: 1 ) – Please choose one

ASK, PSK, FSK and QAM are examples of modulation

  • digital-to-digital
  • digital-to-analog
  • analog-to-analog analog-to-digital

Question No: 17 ( Marks: 1 ) – Please choose one

The bit rate always equals the baud rate in which type of signal?

  • FSK
  • QAM
  • 4-PSK
  • PSK

Question No: 18 ( Marks: 1 ) – Please choose one

Asynchronous transmission is

  • Slow
  • costly
  • non-effective
  • fast

Question No: 19 ( Marks: 1 ) – Please choose one

A converts an analog signal into a digital signal.

  • Demodulator
  • Modulator
  • Digital-to-analog converter

Question No: 20 ( Marks: 1 ) – Please choose one

The information to be communicated in a data communications system is the

Medium

Protocol

► Message

Transmission

Question No: 21 ( Marks: 1 ) – Please choose one

Which is not an element of protocol

semantics

timing

► communication service module

Question No: 22 ( Marks: 1 ) – Please choose one

Line configuration refers to the way two or more devices attach to a           .

► Link

Circuit

Route

Node

Question No: 23 ( Marks: 1 ) – Please choose one

                 requires the maximum number of I/O ports.

Bus

Star

► Mesh

Ring

Question No: 24 ( Marks: 1 ) – Please choose one

Which topology requires a central controller or hub?

Mesh

► Star

Bus

Ring

Question No: 25 ( Marks: 1 ) – Please choose one

Layers 5, 6 and 7 also called as network support layers.

True

► False

Question No: 26 ( Marks: 1 ) – Please choose one

Internet with small “i” specifies the world wide Network the actual internet.

True

► False

Question No: 27 ( Marks: 1 ) – Please choose one

Data synchronization is a function related with                     

► session layer

presentation layer

transport

Question No: 28 ( Marks: 1 ) – Please choose one

OSI model was developed prior to TCP/IP model.

► True

False

Question No: 29 ( Marks: 1 ) – Please choose one

Fourier transform tells us that any digital signal can be decomposed into infinite number of periodic signals

True

► False

Question No: 30 ( Marks: 1 ) – Please choose one

A signal that repeats a pattern over a regular interval of time is called             .

► periodic signal

analog signal

composite signal

Question No: 31 ( Marks: 1 ) – Please choose one

Frequency band in which 99% of the total power resides is called           

► power bandwidth

half power bandwidth

3dB bandwidth

F.M.

Question No: 32 ( Marks: 1 ) – Please choose one

In differential Manchester we require two transition or signal changes to represent binary ________

zero

► one

both zero and one

Question No: 33 ( Marks: 1 ) – Please choose one

In Alternate mark inversion the term mark comes from                

► telegraphy

telephony

digital telephony

Question No: 34 ( Marks: 1 ) – Please choose one

A 56k modem can download at a rate of                    Kbps and upload at a rate of                    Kbps.

33.6: 33.6

► 33.6: 56.6

56.6: 33.6

56.6: 56.6

Question No: 35 ( Marks: 1 ) – Please choose one

Asynchronous transmission is                     

► slow

costly

non-effective

fast

Question No: 36 ( Marks: 1 ) – Please choose one

At the                            layer, a DCE takes data generated by a DTE.

► physical

transport

data link

application

Question No: 37 ( Marks: 1 ) – Please choose one

                  requires more bandwidth.

FSK

► ASK

PSK

QAM

Question No: 38 ( Marks: 1 ) – Please choose one

Which topology requires a central controller or hub?

Mesh

► Star

Bus

Ring

Question No: 39 ( Marks: 1 ) – Please choose one

Unidirectional traffic movement is overcome by dual ring technology.

► True

False

Question No: 40 ( Marks: 1 ) – Please choose one

Which one best describes the given statement:

“To allow multiple users to share total capacity of a transmission medium”

congestion control

exchange management

► multiplexing

Question No: 41 ( Marks: 1 ) – Please choose one

Which one is not among standard creation committee.

► internet society and IETF

ITU-T

IEEE

Question No: 42 ( Marks: 1 ) – Please choose one

Frequency of a failure and network recovery time after a failure is measures of the                          of a network.

► Performance

Reliability

Security

Feasibility

Question No: 43 ( Marks: 1 ) – Please choose one

3dB is also called as power bandwidth.

True

► False

Question No: 44 ( Marks: 1 ) – Please choose one

ASK, PSK, FSK and QAM are examples of                         modulation.

digital-to-digital

► digital-to-analog

analog-to-analog

analog-to-digital

Question No: 45 ( Marks: 1 ) – Please choose one

Packet switching is a connection oriented service.

True

► False

Question No: 46 ( Marks: 1 ) – Please choose one

Data synchronization is a function related with                     

► session layer

presentation layer

transport

Question No: 47 ( Marks: 1 ) – Please choose one

Fourier transform tells us that any digital signal can be decomposed into infinite number of periodic signals

True

► False

Question No: 48 ( Marks: 1 ) – Please choose one

The internet model consists of                  layers.

► three

two

five

seven

Question No: 49 ( Marks: 1 ) – Please choose one

Analog to digital conversion is also termed as modulating an analog signal.

True

► False

Question No: 50 ( Marks: 1 ) – Please choose one

PCM is the first process of PAM.

True

► False

Question No: 51 ( Marks: 1 ) – Please choose one

A modulator converts a(n)                        signal to a(n)                         signal.

FSK: PSK

► Digital: analog

Analog: digital

PSK: FSK

Question No: 52 ( Marks: 1 ) – Please choose one

The                               layer changes bits into electromagnetic signals.

► physical

data link

transport

► none of given

Question No: 53 ( Marks: 1 ) – Please choose one

We need                         to decompose a composite signal into its components.

► fourier transform

nyquist theorem

shannon capacity

Question No: 54 ( Marks: 1 ) – Please choose one

The bit rate always equals the baud rate in which type of signal?

► FSK

QAM

4-PSK

PSK

Question No: 55 ( Marks: 1 ) – Please choose one

There are           possible variations of 16 QAM.

five

two

► three

four

Question No: 56 ( Marks: 1 ) – Please choose one

Number of signal units per second that are required to represent a bit is called bit rate.

True

► False