Data communications and computer networks past paper

Data communications and computer networks all previous/ past question papers

-Data communications and computer networks –Computer Science all subject past paper  computer networks-Course – computer networks Project idea -Data communications and computer networks MCQ -Data communications and computer networks -Interview Question  –Computer Science all courses -Technology –University Past Paper -Programming language –Question paperold paper

Final question paper 2020


a) Write down the properties of Fiber-Optic cable

b) Construct (15, 11) Hamming code for the message 11010010100 by considering even parity.


a) Brietly explains Virtual-Circuit Networks (6)

b) Construct a cyclic code (7, 4) using the generator polynomial G(x)=x3+x+1, Consider a data vector d = 1001.


a) Ixplains the different types of Data Link Layer Protocols. b) Write the characteristics of standard ETHERNET. (7)

Describes the concept of Random Access Media Access Control (MAC). b) Write the note on Frequency Division Midtiplexing with diagrams and examples. (6)

Sessional 2 2020


a) Briefly explain Quadrature Amplitude Modulation (QAM). What are the limitations in other types of digital to analog conversion techniques and how these limitations overcome by QAM? (4

b) Differentiate between Pulse Code Modulation and Delta Modulation. Which technique is better and why?


a) Assume that a voice channel occupies a bandwidth of 4 KHz. We need to combine four voice channels into a link with a bandwidth of 16 kHz, from 30 to 46 kHz. Show the configuration, using the frequency domain. Assume there are no guard bands. (3.5)

b) Draw the diagram of the following bit pattern by using HDB3 Scrambling technique: (4

Sessional 1 2020

Q.1: Give the short answers of the followings:

1. What is mean by Jitter?

II. What is mean by Signal-to-Noise Ratio (SNR)

Draw the figure for AMI and pseudoternary Bipolar scheme of the following message: 00110100110

Q.2: (1+3)

a) Demonstrates the concept “effect of lack of synchronization” with the help of diagr.

b) Briefly explains the Network and Transport layer of Internet protocol suite.

Q.3: What is the difference between “Non-Return-to-Zero (NRZ)” and “Return-to-Zero (RZ)”? Thoroughly explain with examples and diagrams. What are the schemes used to handles the problems encountered in NRZ?

Mid term Examination 2021


Draw the graph of the HDB3 scrambling scheme using the following data streams:



Assume that a voice channel occupies a bandwidth of 4KHZ.we need to multiplex voice channels with guard bands of 500Hzusing FDM. Calculate the required bandwidth.


Discuss the types of transmission impairment.


Which of the four digital-to-analog conversion techniques (ASK, FSK, PSK AND QAM) is the most susceptible to noise? Defend your answer.

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