Data Communication Bord Question 2008- 2015
B.Sc(HONS) IN CSE PART-II, FOURTH SEMESTER
EXAMINATION,2008
CSE-226
(Data Communication)
Examination Code:
614
Time--- 3 hours
Full marks—80
1. (a)
Illustrate a communication model in simplified form.
(b)
Briefly describe major communication tasks that involved in data communication.
(c)
Distinguish between LAN and WAN.
(d) What do you mean by network?
Compare TCP/IP protocol, suite and OSI reference model.
2. (a)
Define the terms frequency, spectrum and bandwidth of a signal.
(b) What
are major transmissions? Explain. Write down about thermal noise.
(c) Using Shannon’s formula,
estimate the channel capacity of a voice grade telephone line having S/N ratio
of 30db and bandwidth 3400Hz.
(d) Name the common guided
transmission media and give the physical description. Application areas and
transmission characteristics of any one of them.
3. (a) Write
down the advantage of packet switching over circuit switching.
(b)
Distinguish between datagram and virtual circuit with diagram.
(c)
Write short note on any two of the following:-
(i)
Microwave transmission.
(ii)
Time division switch.
(iii)
Cellular system.
(Amplitude
Modulation (AM).
4. (a) What
are three popular ARQ mechanisms for error control in data communication?
(b) How
Does ARQ correct an error?
(c) How
does Go-Bank_N ARQ differ from selective Repeat ARQ?
(d)
Write down the types of HDLS frames and give a brief description of each.
5. (a) Write down about basic
characteristics of HDLC protocol. Briefly explain its frame format.
(b) With figure explain FDM.
Distinguish between Synchronous and Statistical TDM.
(c) Explain CRC technique for error
detection.
(d) Describe with diafram the
advantages of multistage space devision switch with diagram.
6. (a) Why is FM superior to AM?
(b) Compare the FM bandwidth the AM
bandwidth.
(c) What are the advantages QAM over
ASK and PSK?
(d) Given a bandwidth of 5000 Hz for
an 8-PSK signal. Calculate the band rate.
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B.Sc(HONS) IN CSE PART-II, FOURTH SEMESTER
EXAMINATION,2009
CSE-226
(Data Communication)
Examination Code:
614
Time--- 3 hours
Full marks—80
1. (a) What is data communication?
Describe a simple data communication model.
(b)
Write down the difference between circuit switching and packet swiching.
(c) What are the features of frame
relay?
(d) Describe LAN and WAN.
2. (a) Explain different encoding or
modulation techniques for transmitting digital data into analog signals?
(b) Why data encoding is necessary?
(c) Briefly describe digitization
and PCM with necessary figure.
(d) Describe the expression for
amplitude modulation wave.
3. (a) What do you mean by synchronous and
asynchronous transmission? Explain with figure.
(b) Explain CRC with figure.
(c) Why flow control is necessary?
(d) What is ARQ? Name various
kinds of ARQ.
4. (a) What is network topology? Describe
its variance.
(b) Explain the operation of
Repeater and Bridge.
(c) What is bit stuffing? Suppose
the data is 11111111111101111101111110. What will be the data pattern after
applying bit stuffing in HDLC?
(d) What is Microwave signal?
Describe it in brief.
5. (a) What is Nyquist bandwidth? Where is
it brief.
(b) Describe optical fiber and
twisted oair cable in brief.
(c) Describe NRZ-I, Bipolar AMI and
Manchester for the following data
0 1 0 0 1 1 0 1
0 1 1
(d) Give
two examples of full duplex and half-duplex transmission.
6. (a) What
is multiplexing? Discuss Frequency division multiplexing technique.
(b)
Compare TCP/IP with OSI model.
(c) What is IP address? Describe
A B C and D class IP address.
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B.Sc(HONS) IN CSE PART-II, FOURTH SEMESTER
EXAMINATION,2010
CSE-226
(Data Communication)
Examination Code:
614
Time--- 3 hours
Full marks—80
1. (a) What
is the fundamental purpose of data communication?
(b) Discuss simplified data
communication model with block diagram.
(c) Define guided and unguided
Media.
(d) What are the activities of
each layer in The OSI layers?
2. (a) Explain
the basic principles of ASK and FSK.
(b) What
is constellation diagram? Show the constellation diagram of QPSK.
(c) What do you mean by line
coding and block coding? Encode the bit stream 10110101 by Manchester and
Differential Manchester encoding techniques.
(d) What are beat rate and Baud
rate? A signal is carrying four bits in each signal element. If 1000 signal
elements as per second, find the bit rate and Baud rate.
3. (a) What
is multiplexing? Explain how FDM combines multiple single into one.
(b) Discuss synchronous TDM with
diagram. Distinguish between Multilevel TDM and Multiple slots TDM.
(c) With
a neat diagram explains the interleaving technique.
(d)
Describe the “Setup Request” phase of a Virtual circuit. Network (VCN).
4. (a) Construct
the human code for the beat sequence 10011101.
(b) Assuming even parity. Find
the parity bit for each of the following units:
(i) 10001011
(ii) 1110111
(c) Given a remainder of 111, a
data unit of 10110011 and a divisor of 1001, find whether there is an error or
not the data unit.
(d) What is a crossbar switch?
What is the major limitation? Explain how a multistage switch overcomes the
limitations of the crossbar switch.
5. (a)
Explain satellite transmission with VSAT configuration.
(b) What
are the important applications of satellite?
(c) What
is the base of pulse code modulation? Why delta modulation is used?
(d) Data exchanges over a
transmission line can be classified as full duplex or half duplex. Compare this two way of transmission.
6. (a) What is flow control? Describe the
process of stop and control with necessary diagram.
(b) Explain the operation of
stop and wait ARQ error control method in case of lost and damaged frames.
(c) What is sliding window? What
is the purpose of it? A sliding window protocol uses a window of side 15. How
many bits are needed to define the sequence number?
(d) What
is ISDN? Discuss different types of channels used in ISDN.
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B.Sc(HONS) IN CSE PART-II, FOURTH SEMESTER
EXAMINATION,2011
CSE-226
(Data Communication)
Examination Code:
614
Time--- 3 hours
Full marks—80
1 (a)
Define standard. State and explain the characteristics of data communication
system.
(b) What
is protocol? What are the key elements of protocol?
(c)
Describe TCP/IP model.
(d) Briefly discuss about the
Nyquist bandwidth and Shanon capacity formula.
2. (a)
Define the terms frequency spectrum and bandwidth of a signal.
(b) What types of impairments
are common in data communication? Describe different types of noise.
(c) Using Shannon’s formula
estimates the channel capacity of a voice grade telephone line having S/N ratio
of 30dB and land width 3400Hz.
(d) Name the common guided
transmission media and give the physical description areas and transmission
characteristics of any one of them.
(e) Depict and describe VSAT
communication system and explain.
3. (a) Why scrambling techniques is used
for digital to digital conceding?
(b) Distinguish between AM, FM and
PM.
(c) Describe CRC technique for error
detection.
(d) Describe the procedure of dial
up operation using the interface of EIA-232 interface.
4. (a) What is multiplexing? Describe
synchronous time division multiplexing with figure.
(b) What is packet switching?
Mention the advantages of packet switching over circuit switching.
(c) Describe asynchronous transfer
mode (ATM) with respect to switching mode, Packet size. ATM cells.
(d) State necessity to Frame Relay
in communication network.
5. (a) With diagram, explain frequency
division multiplexing (FDM).
(b) Distinguish between synchronous
and statistical TDM.
(c) With diagram describe the
architecture of a three stage space division switch.
(d) Describe the advantages and
disadvantages of optical fiber.
6. Write short note with necessary diagram
(any four) :---
(a) QPSK;
(b) HDLS;
(c) Null modem;
(d) Cellular system;
(e) Channel capacity;
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B.Sc(HONS) IN CSE PART-II, FOURTH SEMESTER
EXAMINATION,2012
CSE-226
(Data Communication)
Examination Code:
614
Time--- 3 hours
Full marks—80
1. (a) Define Data Communication. Briefly
explain the simplified model of data Communication.
(b) What are the differences between
half-duplex and full-duplex transmission modes?
(c) Explain the functions of
transport layer and network layer of OSI reference model.
(d) What is the difference between a
port address, a logical address and a physical address?
2. (a) What is transmission impairments?
Explain the types of transmission impairments.
(b) What do you mean by request
bandwidth and shinning capacity rate?
(c) What are the bit rate and band
rate? A signal is carrying four bits in each signal element. If 1000 signal
elements are sent per second, find the bit rate.
(d) Sketch the signal waveforms of
NRZ-1 , NRZ-1 and Manchester encoding scheme for 101100111.
3. (a) What is multiplexing? Explain
synchronous time division multiplexing techniques.
(b) Which of the three multiplexing
techniques are common for fiber optic link? Explain the reason.
(c) Two channels, one with a bit
rate of 150kbs and another with a bit rate of 140kbs are to the multiplexing
using pulse stuffing TDM with no synchronous bits. Answer the following
questions:-
a. What is
the size of a frame in bits?
b. What is
the frame rate?
c. What is
the duration of a frame?
d. What is
the data rate?
(d) What is VSAT? Discuss VSAT
communication system with configuration.
4. (a) Describe ASK, FSK and PSK with
figure.
(b) Write down the digital encoding
format.
(c) Explain error detection process.
5. (a) Describe the model of frame
information of flow control.
(b) Describe the adopting routing
strategies in the packet switch network.
(c) What are the step of sousing
window flow control? Describe.
6. (a) Write short notes (any four):-
(a) PCP/IP.
(b) Channel capacity.
(c) Warless
transmission.
(d) CRC.
(e)
Digital Switch.
(f)
Packet Switching Networks.
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B.Sc(HONS) IN CSE PART-II, FOURTH SEMESTER
EXAMINATION,2013
CSE-226
(Data Communication)
Examination Code:
614
Time--- 3 hours
Full marks—80
1. (a) Define data communication. Draw and
explain the simplified model of data communication.
(b) Write down the difference
between simplex and duplex transmission mode with suitable example.
(c) Make a comparison between
TCP/IP and OSI.
(d) Distinguish between
connection oriented and connectionless protocols.
(e) Define protocol. List the
key elements of protocols.
2. (a) Name the type of transmission
impairments. Briefly explain the different types of noise with examples.
(b) What does the Nyquist
theorem and Shannon capacity formula have to do with communications?
(c) We have a channel 5KHz bandwidth. If We want
to send data at 150 kbps, what is the minimum SNR (dB)?
(d)
Define frequency, spectrum, and bandwidth and buad rate with example.
3. (a) What
is unguided transmission media? What are the drawback of this?
(b) Briefly explain ASK, FSK,
PSK, and QAM techniques with the principle advantages and disadvantages.
(c)
Explain the Pulse Code Modulation (PCM) technique and state its limitation.
(d) What is optical fiber
communication? Explain the characteristics of this communication system.
4. (a)
Define multiplexing. What are the different types of multiplexing techniques?
(b)
Briefly explain the Synchronous Time-Division multiplexing technique.
(c) Which of the three
multiplexing techniques are common for fiber optic links? Explain with reason.
(d) Two channels, one with a bit
rate of 150kbs and another with a bit rate of 140kbs are to the multiplexing
using pulse stuffing TDM with no synchronous bits. Answer the following
questions:-
(i) What is the size of a frame in bits?
(ii) What is the frame rate?
5. (a) What
is Synchronous Time Division Multiplexing? What are the features of it?
(b)
Compare between the features of FDM and TDM.
(c) What is switching over
circuit switching network. Describe packet switching principals with necessary
figure.
6. (a) What is packet switching network?
Mention the advantages of packet switching over circuit switching network.
(b) Explain about virtual
circuit and datagram approach of pocket switching network with necessary
diagram.
(c) What is router and routing
table? Explain the important characteristics of routing function.
(d)
Explain about X-25 protocol standard.
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B.Sc(HONS) IN CSE PART-II, FOURTH SEMESTER
EXAMINATION,2014
CSE-226
(Data Communication)
Examination Code:
614
Time--- 3 hours
Full marks—80
1. (a) Define data communication. Draw and
explain the simplified model of data communication.
(b)
Write down the difference between circuit switching and packed switching.
(c) What is the difference
between a port address, a logical address and a physical address?
(d) What
is protocol? Describe the layers of OSI model.
2. (a) What
is transmission implement? Explain the type of transmission implement.
(b)
Difference between duded media and unguided media.
(c) What is the relationship between a
singular’s specimen and a band-width?
(d) Define
fundamental frequency and channel capacity.
(e)
Describe the encoding and modulation technique with figure.
3. (a)
Define frequency, spectrum, and bandwidth and buad rate with example.
(b) Briefly explain ASK, FSK,
PSK, and QAM techniques with the principle advantages and disadvantages.
(c) Briefly explain Puce Code
Modulation (PCM) technique with its limitations.
(d) For the following digital
data sketch the signal waveforms using NRZ-1, Bipolar AMI and Manchester encoding scheme for
1011000111001.
4. (a)
Define multiplexing/ What are the different types of multiplexing techniques?
(b)
Briefly explain the Synchronous Time-Division multiplexing techniques.
(c) With
neat diagram explain the interleaving technique.
(d) A multiplexer engine’s for
100 kbps channel using a time shot of 2 bits. Show the out with four arbitrary
inputs:-
(i)
What is the frame rate?
(ii)
What is the frame duration?
(iii)
What is the bit rate?
(iv)
What is the bit duration?
5. (a) Name
the advantages of optical fiber over twisted-pair and conical cable.
(b) How does sky propagation
differ from line-of-sight propagation?
(c)
Discuss about warless transmission waves.
(d)
Describer the need for switching and define a switch.
(e)
Compare space division and time-division switches.
6. Write
short notes (any four):--
(a)
Digital switch.
(b)
Cellular Communications.
(c) Stop
and wait ARQ.
(d)
VSAT.
(e)
QPSK.
(f) X-25 Protocols.
B.Sc(HONS) IN CSE PART-II, FOURTH SEMESTER
EXAMINATION,2015
CSE-226
(Data Communication)
Examination Code:
614
Time--- 3 hours
Full marks—80
1. (a) Define data communication. Explain
the characteristics of a data communication system.
(b) What
is protocol? Describe the key elements of protocol/
(c) What
is transmission impairments? Explain the types of transmission impairments.
(d)
Describe the layers of TCP/IP model.
2. (a) Define analog and digital signal.
Briefly explain the different types of noise in data transmission.
(b) What is channel capacity?
Briefly explain the Nyquist Bandwidth and Shanon capacity formula.
(c)
Describe VSAT configuration.
(d) Given a channel with an
intended capacity of 20MbPS. The bandwidth of the channel is 3 MHz. What
signal-to-noise ratio is required in order to achieve this capacity?
3. (a)
Define data rate and signal rate.
(Describe
data encoding & modulation techniques with figures.
(c)
Distinguish among AM,FM & PM.
(d)
Explain pulse code modulation (PCM) technique with diagram.
(e)
Describe CRC technique for error detection.
4. (a)
Define multiplexing. Describe Frequency division Multiplexing (FDM).
(b)
Compare between the features of FDM and TDM.
(c)
Given the following information, find the minimum bandwidth required for the
path:
FDM
Multiplexing
Five
devices, each required 4000Hz,
200Hz
guard band for each device.
(d) What
is IP address? Classify the IP address of class A, B, C & D network.
5. (a)
Distinguish guided and unguided media with examples.
(b) What
is packet switching over circuit switching network.
(c) What is router & routing
table? Explain the important characteristics of routing function.
(d) A channel has a bit rate of
4KbPS and a propagation delay of 20 m sec. For what range of frame size does
stop and wait give and efficiency of at least 50 percent?
6. Write
short notes on the following (any four):-
(a)
Circuit switching.
(b)
Wireless transmission;
(c)
HDLC.
(d)
ARQ.
(e)
ATM network.
(f)
Datagram.
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