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ASSALAM O ALAIKUM all fellows

ALL IN ONE CS601 Midterm PAPERS, MCQz&

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MIDTERM EXAMINATION Spring 2009

CS601- Data Communication (Session - 3)

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

Frequency of a failure and network recovery time after a

failure is measures of the ____________ of a network.

Performance (page 14)

Reliability

Security

Feasibility


Secondary hub in a tree must be a passive hub.

True

False (may be Activeor Passive HUB) page 31
http://[email protected]/http://[email protected]/http://[email protected]/http://[email protected]/


2/49


In mesh topology, if there are five nodes then there will be

_______ links.

5

10 ( P29 )

15

20


Internet with small i specifies the world wide Network

the actual internet.

True

False (P39)


Data link layer deals with mechanical and electrical specifications

of transmission medium and interface

True (page 44)

False


When data are transmitted from device A to device B, the

header from As layer 4 is read by Bs __________ layer.

physical

Transport

application

none of the given



3/49

Time domain plot show changes in signal phase with respect

to time.

True

False (page 63)


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

called_______

power bandwidth (P67)

half power bandwidthF.M.


The inversion of the level at 1 bit is called as __________

NRZ-LNRZ-I (P73)

RZ


Which of the encoding schemes have bandwidth problems?

Differential ManchesterAMI (P77)

RZ


Bi phase and bipolar are same terms.

True


4/49

False (Pg78)


Quantization means measuring amplitudes of signal at equal

intervals.

True

False (Pg80)


The last process in PCM is _________ digital data into

digital signal.

Encoding ( Page70)

decoding

modulating


Which modulation technique involves tributes, eight

different phase shifts, and one amplitude?

FSK

8-PSK

ASK

4-PSK


Asynchronous transmission is ___________

slow (Page 99)

costly

non-effective


5/49

fast


Synchronous transmissions have _____________.

a start bit

a stop bit

gaps between bytes

none of the given (Page 99)


Asynchronous transmissionThe __________ generates the data and passes it along

with any control information to a ________________.

DTE; DCE (Page 101)

DCE; DTE

DCE; node

DTE; application


A human brain is considered as a ___________

driver

machine

DTE (P101)DCE


The last modified version of EIA-232 standard is

______________

EIA - 232 D (P102)


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EIA-232 A

EIA-232 B

EIA-232 C


A ______________ converts an analog signal into a digital

signal.

Demodulator (Page 110)

Modulator

Digital-to-analog converter

Question No: 21 (Marks: 2)

What is simplex mode of transmission?

Answer:

Communication is Unidirectional

Only one of the two stations can transmit

Other can only receive.This is called simplex mode of transmission

see (P34)


What is HDB3.

Answer:

Alteration of AMI adopted in Europe and Japan

Introduces changes into AMI, every time four consecutive

zeros are encountered instead of waiting for eight zeros as in

the case of B8ZS. (P78)


7/49


Write a note on full duplex mode of transmission.

Answer:

Both stations can transmit and receive simultaneously

Two way street with traffic flowing in both directions at the

same time

Signals traveling in either direction share the capacity of the

link

The sharing can take place in two ways:Either the link must contain two physically separate

transmission paths:

One for sending and

One for receiving

Created 2010/9 Midterm

ASSALAM O ALaIKUM all fellows

ALL IN ONE CS601 Midterm PAPERS & MCQz

Created BY Farhan & Ali

BS (cs) 3rd sem

Hackers Group

Mandi BahauddinRemember us in your prayers

[email protected]

[email protected] # 2

MIDTERM

EXAMINATION


8/49

Spring 2009CS601- Data

Communication (Session - 1)

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

In RS 422 Balanced mode two lines carrysignals which are not identical to each other.

Same (PAGE109) Different Digital Analog


The generates the data and passes it along with anycontrol information to a.

DTE; DCE (PAGE 101) DCE; DTE DCE; node DTE; application


In transmission, a start bit and a stop bit frame a

character byte.

Asynchronous serial (Pg 99) Synchronous serial

Parallel Asynchronous & Synchronous serial


In transmission, bits are transmitted simultaneously,

each across its own wire.


9/49

Asynchronous serial Synchronous serial Parallel Asynchronous & Synchronous serial

Referencehttp://highered.mcgraw-

hill.com/novella/MixQuizProcessingServlet


Asynchronous transmission is

slow (Pg 99) Costly

Non-effective

Fast
http://highered.mcgraw-hill.com/novella/MixQuizProcessingServlethttp://highered.mcgraw-hill.com/novella/MixQuizProcessingServlethttp://highered.mcgraw-hill.com/novella/MixQuizProcessingServlethttp://highered.mcgraw-hill.com/novella/MixQuizProcessingServlet


10/49


In transmission the timing of the signal is unimportant.

Asynchronous (P99)

SynchronousPolarBi-polar

Question No: 7 ( Marks: 1 ) - Please choose oneIn 8QAM each signal shift or one baud represents__________

4bits 2bits 5

bits 3bits

Question No: 8 ( Marks: 1 ) - Please choose onePCM is the first process of PAM.

True False


Bi phase encoding is a type of bipolar encoding in which weuse two voltage levels.

True (Pg 73) False


The amplitude of a digital signal depends upon the


11/49

to represent a bit.

Phase Voltage Wavelength

Question No: 11 ( Marks: 1 ) - Please choose oneTime domain plot show changes in signal phase with respect to

time.

True False (Page 63)


OSI model was developed prior to TCP/IP model.

True False (Pg 54)


12/49


Layer is the layer closest to the transmission medium.

Physical (Pg45)

Data link Network

Transport


Data chunk at data link layer is called ______

framepacket (Pg38)datagram


The internet model consists of layers. Three (Page 239) Two

Five

Seven

Question No: 16 (Marks: 1 ) - Please choose oneRepresentation of links that connect nodes is called as

physical topology.

Geometrical (P28)logicalphysical


13/49

Question No: 17 (Marks: 1) - Please choose oneis a multipoint topology.

Ring Mesh Tree Bus (P31)


In mesh topology, if there are five nodes then there will belink

s.

5 10 (P10)


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15

20

Question No: 19 (Marks: 1) - Please choose

one

Non proprietary standard is also termed as de factostandard.

True (Page 23)

False

Question No: 20 ( Marks: 1 ) - Please chooseoneEffective network mean that the network has fast

delivery, timeliness and

High bandwidth Duplex transmission Accurate transmission (Page 6) Low bandwidth

Question No:21

What is purpose of distributed processing?

Answer:

Multiple computers working on a problem can solve a

problem faster than a computer working alone. (P13)

Question No: 22 (Marks: 3 )What is HDB3.

A


15/49

Alteration of AMI adopted in Europe and Japan

Introduces changes into AMI, every time four

consecutive zeros are encountered instead of waiting for

eight zeros as in the case of B8ZS . (P78)

More dataHDB3 (High Density Bipolar of order 3 code) is a

telecommunications line code mainly used in Japan, Europe and

Australia (for example, in E-1 lines) and is based on AMI. It is also

very similar to the B8ZS encoding used in T-1 lines.

Read

more: http://wiki.answers.com/Q/What_is_HDB3#ixzz1LxcLVs22

Question No: 23 ( Marks: 5 )

Differentiate between the following terms.(a) Syntax and Semantics ofprotocol.

Answer:Syntax:

Communication between peer entities (P21)

Semantics:

Client/server (P21)

(b) Network management andexchange management.

Answer:

Exchange Management

Error Detection and Correction (P17)
http://wiki.answers.com/Q/What_is_HDB3#ixzz1LxcLVs22http://wiki.answers.com/Q/What_is_HDB3#ixzz1LxcLVs22


16/49

Security

(c) Monolithic and structured.

Answer: (P21)

Monolithic

Communications is a complex task

To complex for single unit

StructuredStructured design breaks down problem into smaller units

Layered structure


Differentiate

between the

following terms. a)

Frequency spectrum

and bandwidth.

Answer: (P66)

Frequency Spectrum / Bandwidth

Frequency Spectrum: of a signal is the collection of all

the component frequencies it contains

I i h i F d i h


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Bandwidth: of a signal is the width of the frequency

spectrum

In other words, Bandwidth refers to the range of the

component frequencies and Frequency Spectrum

refers to the elements within that range

(b) Bandwidth and throughput.

Answer: (P144)

Measurement of how fast data can pass through a point o

In other words, if we consider any point in the TX

Medium as a wall through which bits pass, then

throughput is the number of bits that can pass this wall

in second

(c) Bit interval and bit rate.

Answer: (P68)

Bit Interval and Bit Rate

Most digital signals are periodic and thus Period and

Frequency are not the appropriate terms to describe

them

Bit Interval (seconds)Time required sending one single bit


18/49

Number of bits sent per second


ALL IN ONE CS601 Midterm PAPERS &

MCQz


BS (cs) 3rd sem

Hackers Group

Mandi Bahauddin

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Paper # 3

MIDTERM EXAMINATION SPRING 2010

CS601- Data Communication (Session - 1)

Please choose one ( Marks: 1 )

Effective network mean that the network has fast

delivery, timeliness and ---------------?

high bandwidth


19/49

low bandwidth


A set of devices connected by communication links is

called networking

True (Pg12)

False


_______ is a multipoint topology.

Ring

Mesh

TreeBus


_________requires the maximum number of I/O

ports.

Bus

Star

Mesh (Pg29)

Ring



20/49

True (Pge 33)

False


As the data packet moves from the lower to the upper

layers, headers are __________.

added

subtractedrearranged

modified


Data chunk at data link layer is called________

framepacket (Page 38)

datagram


The _________ layer is the layer closest to the

transmission medium.

Physical (PAGE45)

data link

network

transport


21/49

Data synchronization is a function related with

___________

session layer (page 51)

presentation layer

transport


Which layer is responsible for source to destination

delivery of entire message?

transport layer (Page 59)

network layer

session layer

application layer

Question No: 11 ( Marks: 1 ) - Please choose oneEncryption and encoding are the same terms.

True

False (Page52)


TCP/IP model Application layer incorporate OSI

Application and presentation

layers

True

False


22/49

A sine wave must be an analog signal.

True (Page 58)

False


A periodic signal can always be decomposed into

___________

exactly an odd number of sine waves

a set of sine waves

set of sine waves, one of the which must have a

phase of 00

none of the given (Page 58)


Manchester is a type of ____________encoding.

Bi-phase (Page 75)

polar

biphase & polar

none of the given


The powerful carrier signal is called asthe___________


23/49

base signal

carrier frequency and base signal

none of given


Modulation of an analog signal can be accomplished

through changing the _________ of the carrier

signal.

amplitude

frequency

phase

all of the given (Page 58)


In _____________ transmission, bits are transmitted

over a single wire, one at a time.

Asynchronous serial

Synchronous serial

Parallel (Page 99)

Asynchronous & Synchronous serial


In RS 422 Balanced mode two lines carry ________

signals which are not identical to each other.


24/49

digital

analog


A ______________ converts an analog signal into a

digital signal.

Demodulator (Page 110)

ModulatorDigital-to-analog converter


How does noise affect FSK?

Answer:

The duration of the noise is normally longer than theduration of a bit which means that when noise affects

data, it affects a set of bits. (Page # 170)

Question No: 22 ( Marks: 3 )Define Bit interval and Bit rate.

Answer: (Page # 68)

Bit Interval and Bit Rate

Most digital signals are a periodic and thus Period and

Frequency are not the appropriate terms to describe

them

Bit Interval (seconds)


25/49

Bit Rate (bps)

Number of bits sent per second


Write down the names of layers present in TCP/IP

Protocol Suite?

Answer: (Page 54)

Physical (physical standards)

Data Link (N/w Interface)

Network (Interconnectivity)Transport (Transport Functions)

Application (Session, Pres, app of OSI)

ASSALAM O ALAIKUM all fellowsALL IN ONE CS601 Midterm PAPERS &

MCQz


BS (cs) 3rd sem

Hackers Group

Mandi Bahauddin


[email protected]

[email protected] # 4


26/49

MIDTERM EXAMINATION

Spring 2010

CS601- Data Communication

Time: 60

min

Marks:

40

Question No: 1 ( Marks: 1 ) - Please choose oneWhich topology requires a central controller or hub?

Mesh

Star

Bus

Ring


Trailer is only added at ________ layer of OSI model.

_ Data link

_ Physical

_ Network

_ Application


Unidirectional traffic movement is overcome by dual ringtechnology.


27/49

False


Which one best describes the given statement:

"To allow multiple users to share total capacity of a

transmission medium"

Congestion control

Exchange management

multiplexing


28/49


Which one is not among standard creation committee?

Internet society and IETF (Forum)

ITU-T

IEEE


Set of rules that govern communication is called

OSI model

Protocol

TCP/IP model

Datagram


Frequencies of a failure and network recovery timeafter a failure are measures of the _____ of a


29/49

Performance

Reliability page /16

Security

Feasibility


30/49


3dB is also called as power bandwidth.

True

False

3DB half power bandwidth, p/67


ASK, PSK, FSK and QAM are examples of ______

modulation.

digital-to-digital

digital-to-analog Page /85

analog-to-analog

analog-to-digital


Packet switching is a connection oriented service.


31/49

False

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

Datasynchronizationisafunctionrelatedwith

Session layer page /52

Presentation layer


32/49

transport

PCM is the first process ofPAM.


Fourier transform tells us that any digital signal can

be decomposed into infinite number of periodic

signals.

True page 58

False


The internetmodelconsist

Layers.

three

two

five

seven


33/49

transport

PCM is the first process ofPAM.


Analog to digital conversion is also termed as

modulating an analog signal.

True

False


34/49


A modulator

converts a (n)

Signal

to a (n)Signal.

FSK: PSK

Digital: analog

Analog: digital

PSK: FSK


The layer changes bits intoelectromagnetic signals.

Physical

Data link

Transport

None of given


We need to decompose a composite signal


35/49

Fourier transform page /66

nyquist theorem


36/49


The bit rate always equals the baud rate in which

type of signal?

FSK

QAM

4-PSK

PSK


There are possible variations of 16 QAM.

Five

Two

Three

Four


37/49


ALL IN ONE CS601 Midterm PAPERS &

MCQz


BS (cs) 3rd sem

Hackers Group

Mandi Bahauddin

Remember us in your prayers..

[email protected]

[email protected]

Paper # 5

CS601 Midterms Examination


Which one best describes the given statement:

"To allow multiple users to share total capacity of a

transmission medium"

Congestion control

Exchange management multiplexing



38/49

Transmitting passwords is the responsibility of

Communication service module Network access module

File transfer application


Line configuration refers to the way two or more

devices attach to a ______.

Link

Circuit

Route

Node

Question No: 4 ( Marks: 1 ) - Please choose oneSecondary hub in a tree must be a passive hub.

True

False (may be Activeor Passive HUB)page 31


In mesh topology, if there are five nodes then there

will be _______ links.


39/49

5

10

15

20


Line configuration is the function of ____________

layer

Data link

Network

Physical

Transport

Question No: 7 (Marks: 1) - Please choose oneData link layer deals with mechanical and electrical

specifications of transmission medium and interface

True

False


Session layer is responsible for segmentation and

reassembly.

True


40/49

False


A signal that repeats a pattern over a regular interval

of time is called _______.

Periodic signal

Analogy signal

Composite signal

Question No: 10 ( Marks: 1 ) - Please choose

one

Signal can be controlled by three attributes: Amplitude,

frequency and _______.

Phase page 62

time

wavelength


one

Frequency band in which 99% of the total power

resides is called_______


41/49

power bandwidth

half power bandwidth

3dB bandwidth

F.M.

Question No: 12 ( Marks: 1 ) - Please chooseone

The amplitude of a digital signal depends upon

the________ to represent a bit.

Phase

Voltage

Wavelength


one

DC component is also termed as Direct current

component or a component with non-zero frequency.

False page72

True


42/49


one

The last process in PCM is _________ digital data

into digital signal.

encoding

decoding

modulating


The powerful carrier signal is called as

the___________

Carrier frequency

base signal carrier frequency and base signal

none of given


one

In 8QAM each signal shift or one baud represents

______.

4 bits


43/49

2 bits

5 bits

3 bits


one

Which of the following is most affected by noise?

ASK (options are not shown)

KSAKSF

KSP

MAQ


oneModulation of an analog signal can be accomplished

through changing the ___________ of the carrier

signal.

Amplitude

Frequency

Phase All of the given



44/49

In ____________ transmission the timing of the

signal is unimportant.

Asynchronous Synchronous

Polar

Bi-polar


oneIn _____________ transmission, bits are transmitted

simultaneously, each across its own wire.

Asynchronous serial

Synchronous serial



one

In _____________ transmission, bits are transmitted

over a single wire, one at a time.

Asynchronous serial

Synchronous serial

Parallel


45/49

Asynchronous & Synchronous serial


In _____________ transmission, a start bit and a

stop bit frame a character byte.

Asynchronous serial

Synchronous serial



one

A ______________ converts an analog signal into adigital signal.

Demodulator

Modulator

Digital-to-analog converter


one

_________ requires more bandwidth.


46/49

FSK

ASK

PSK QAM


Why we need a Null Modem?

Answer:

Suppose you need to connect two DTEs in the same

building, for example two workstations.

Modems are not needed to connect two compatible

devices directly

The TX never needs to cross analog lines, such as

telephone lines.


Describe different types of NRZ encoding scheme?

Answer:

Non Return to Zero (NRZ)

o In NRZ Encoding, the level of signal is either positive

or negative

o NRZ-L

Level of the signal depends on the type of bit

it represents


47/49

A +ve voltage usually means the bit is a 1 and a

ve voltage means the bit is a 0 (vice versa)

o NRZ-I The inversion of the level represents a 1

bit

A bit 0 is represented by no change

NRZ-I is superior to NRZ-L due to

synchronization provided by signal change

each time a 1 bit is encountered The string of 0s can still cause problem

but since 0s are not as likely, they are less

of a problem


Describe functions of each layer of OSI Model briefly?Answer:

The Open Systems Interconnect (OSI) model has seven

layers. This article describes and explains them,

beginning with the 'lowest' in the hierarchy (the

physical) and proceeding to the 'highest' (the

application). The layers are stacked this way:

Application

Presentation

Session

Transport


48/49

Network

Data Link

Physical

PHYSICAL LAYER

The physical layer, the lowest layer of the OSI model, is

concerned with the transmission and reception of the

unstructured raw bit stream over a physical medium. Itdescribes the electrical/optical, mechanical, and

functional interfaces to the physical medium, and carries

the signals for all of the higher layers. It provides:

PRESENTATION LAYER

The presentation layer formats the data to be presented

to the application layer. It can be viewed as the

translator for the network. This layer may translate data

from a format used by the application layer into a

common format at the sending station, then translate the

common format to a format known to the application

layer at the receiving station.


49/49


ALL IN ONE CS601 Midterm PAPERS,

MCQz& subjective


BS (cs) 3rd sem

Hackers Group

Mandi Bahauddin


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