5 BCA 3 :COMPUTER NETWORKS NOV/DEC 2007 QUESTION PAPER

                          V SEMESTER B.C.A. EXAMINATION NOV/DEC 2007
                                                               NEW SCHEME
                                                       COMPUTER SCIENCE
                                     5 BCA 3   :  COMPUTER  NETWORKS - I


Time : 3Hours                                                                            Max.Marsk: 80

Instruction : Answer all sections

SECTION-A

Answer any eight questions.Each question carries 3 marks :

1.What are computer networks ?Explain the advantages and dis-advantages.

2.Compare and contrast conncection -oriented and connection less service.

3.Write the advantages of  fibre optics over copper wire.



4.Explain the "piggy backing " concept of sliding window protocol.

5.What  are collision free protocols ?

6.What are half duplex and full duplex communication.

7.What is "Hand Shaking "?

8.What is "Hamming Distance " ? Explain its application in error correction mechanism ?

9.Explain shortest path routing ?

10.What is message switching ?  Explain.

SECTION -B

Answer any four questions.Each question carries fourteen marks:   4 X 14 =56

11.Explain ISO's  OSI reference model

    a)  With a neat Diagram.

    b)Explain various network  topologies.   9 + 5

12.a) What is multiplexing ?Explain FDM and TDM in detail.

     b)Explain the concept of  "Store and forward" networks      10 + 4

13.a)Give an account of error detection and error correction mechanism.

    b)Differentiate the terms "frame" and "packet"         10  + 4

14.a)Explain CSMA and CSMA-CD  in detail.
 
      b)What are pure aloha and slotted aloha  protocols ?          8 + 6

15.a) Explain point to point and Broadcast networks ?
 
     b) Explain IEEE 802.4 token bus.          7 + 7

16.Write Short notes on

  a) Cryptography.

   b) Congestion control.

   c)Character Stuffing.                5 + 5 + 4