Thursday, September 5, 2013

5 BCA 3 :COMPUTER NETWORKS -1 NOV/DEC 2008 QUESTION PAPER

                               V SEMESTER B.C.A. EXAMINATION NOV/DEC  2008
                                                               NEW  SCHEME
                                                       COMPUTER SCIENCE
                          5 BCA 3  : COMPUTER  NETWORKS - 1


Time : 3Hours                                                                            Max.Marsk: 80

Instruction : Answer all sections

SECTION-A

Answer any eight of the following        8 X 3 = 24

1.What is the function of transport layer in OSI  model ?

2.What is  the purpose of twisting of wires in twisted pair ?

3.What is  hamming distance ? Give its significance.



4.Define P- persistent CSMA ?

5.What is Optimality principal ? Explain.

6.Define RPC.

7.Explain user agent in E -mail ?

8.How piggy backing help in network model ?

9. What is upward and downward multiplexing ?

10.Mention the two fundamental cryptographic principles.


SECTION - B

Answe any  four  full questions of the following .      4 X 14 = 56

11.a) How data transmission occurs in ISO-OSI ? Explain .

     b) Discuss physical coding violation techniques for framing      7 + 7

12.a) How do  you allocate channels in  LAN and WAN ? Discuss.

     b) What is binary count down protocol ? State its advantages over bit map protocol

      by giving an example.            7 + 7

13.a) Explain congestion control algorithm.

    b) Describe  the threee different sttes in CSMA/CD.


14.a)  How do you implement addressing issues during conncection management ? explain

      b) How do you handle crash recovery ? Explain the different strategies.      7  + 7

15.a)  What are the three basic requirements the public key Encryption must meet to

      generate the keys used in public key cryptography ? give the algorithm with example

     b)Justify  presentation Layers  is vital in OSI  model.

     b) Justify   presenetation layers is  viatal in a OSI MODEL.     7 + 7

16.Write Short notes on

   
   a)FDDI

   b) Flooding

    c) X.20.                                                    5 + 5 + 4
 


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