5 BCA 3 : DATA COMMUNICATION AND NETWORKS MAY/JUNE 2007

                                 V SEMESTER B.C.A. EXAMINATION MAY/JUNE 2007
                                                               NEW  SCHEME
                                                       COMPUTER SCIENCE
                                       5  BCA 3  : COMPUTER  NETWORKS  - 1


Time : 3Hours                                                                            Max.Marsk: 80

Instruction : Answer all sections

SECTION -A

Answer any eight quesiton .Each question carries three marks.      8 X 3 = 24

1.Write  various applications of internet.

2.Explain Half duplex and full duplex  communication.

3.Explain the major functions of Data link layer.



4.Explain Bridges.

5.What are the services provided by the Transport layer ?

6.what is polling ?

7.What is Computer Network.

8.What is congestion.

9.Explain multiplexing ?

10.Explain data transmission technology in fibre optics.

SECTION -B

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

11.a)  What are connection-oriented  and connection less services ?Explain in detail.

      b) Explain ISO's OSI  reference model in detail with a neat Diagram .      6 + 8 = 14

12.a) Explain various transmission media in detail.

     b)Explain the advantages of fibre optics copper  wire.    10 + 4 = 14

13.a) What are sliding Window protocols ? Explain in detail.

     b) Explain error control and flow control.    8 + 6

14.a)Explain pure aloha and slotted aloha protocols and compare their efficiency in

      channel utilisation.
   

      b)Explain CSMA -CD            10 + 4

15.a) Explain Routers ,Bridges and Gateways with respect  to the working of interent..

    b) Explain X.25 networks with respect to the older public networks.      9 + 5

16.Write short notes on the following :

    a) Manchester Encoding.

    b) ARPANET.

    C) Microwave Transmission.       5 + 4 + 5