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University of Barishal

Department of Computer Science and Engineering

Final Exam

Course Title: Data Communication (CSE-2205)

Semester: 4th | Session: 16-17

Time: 180 minutes | Marks: 60.00

View 206 Topic-wise Questions for this Course

Answer any Five Questions from the followings.

1.

a)

What is block coding? Write down short description about block coding 4B/5B method with NRZ-1 line coding method.

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4 Marks
b)

Briefly explain various types of network topology with real application examples.

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4 Marks
c)

 Differentiate between OSI and TCP/IP model.

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4 Marks
2.

a)

What is Piggybacking? How delayed acknowledgments are handled in Stop and Wait ARQ?

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5 Marks
b)

In a Stop and Wait ARQ system, the bandwidth of the line is 2 Mbps and 1bit takes 40 ms to make a RTT. What is the BDP? If the system data frames are 4000 bits in length, what is the utilization percentage of the link? Compare the result with Go Back N ARQ with a 15 frame sequence.

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4 Marks
c)

Why Go-Back-N ARQ is inefficient in a noisy link?

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3 Marks
3.

a)

A CRC code with C(7,4) is 0110 and the divisor is 1011. Show how the codeword is generated?

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5 Marks
b)

What is Hamming distance for each of the following codewords:
 (i) d (10000, 00000)   (ii) d (10101, 10000)
 (iii) d (11111, 11111)   (iv) d (000,000)

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2 Marks
c)

Sketch the structure of encoder and decoder for simple parity check code.

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2 Marks
d)

Assume the sender sends the dataword 1011. The code created from this dataword is 10111, which is sent to the receiver. Examine the cases whether there is an error or not.

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3 Marks
4.

a)

Briefly explain ASK, FSK, PSK, QAM digital to analog conversion techniques.

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6 Marks
b)

Define carrier signal and constellation diagram as well as its importance in analog transmission.

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3 Marks
c)

Mention your logic about which analog conversion technique is the most susceptible to noise.

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3 Marks
5.

a)

Why need the multiplexing technique in telecommunication.

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3 Marks
b)

Make comparative analysis among multilevel TDM, multiple-slot TDM and pulse stuffed TDM.

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4 Marks
c)

Which of the three multiplexing techniques is (are) used to combine analog signals and digital signals.

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2 Marks
d)

Write down the working procedures of FDM and its application area.

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3 Marks
6.

a)

Define Spread Spectrum and its goals.

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2 Marks
b)

Make differences between FHSS and DSSS.

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4 Marks
c)

Define 4 QAM, 8 QAM and 16 QAM. Draw 16 QAM signal of the following bit stream-
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111

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6 Marks
7.

a)

Define the following terms
    1. Error detection and Error correction.
    2. Single bit error and Burst Error.

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2 Marks
b)

Write down the basic working procedure of Cyclic Redundancy Check (CRC) and Checksum method.

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6 Marks
c)

Write down various classes of IP addresses. Why need Public IP and Private IP address in communication.

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4 Marks
8.

a)

Define modulation technique and its importance in communication.

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2 Marks
b)

Write down the advantages and disadvantages of PCM, PAM, PPM and PDM modulation techniques briefly.

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6 Marks
c)

Define Sub-netting and VLSM with proper examples.

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4 Marks
View 206 Topic-wise Questions for this Course

Contributors of this Question:

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Uploaded By: Onebyzero Edu (Test User) Aug. 17, 2024, 12:58 p.m.
Converted By (Img/PDF to Text): Baishakhi Bir Nov. 28, 2025, 10:54 p.m.
Reviewed By: Obaydul Hasan Nayeem Nov. 29, 2025, 10:51 a.m.
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