Bangalore University B.C.A Computer Application Data Communication and Networks (Y2K8 Scheme) 2010 Question paper

SECTION-A

Answer any ten questions. Each question carries two marks. (2*10=20)
1.What is a Protocol ? Give 2 exapmles.
2.Define Communication Network.
3.Define SNR.
4.A telephone channel has a bandwidth of 3.4kHz and SNR of 10,000.Find the Channel Capacity.
5.Define single bit error and Brust error.
6.Give 2 differences between UTP and STP cables.
7.Compare connection-oriented and cinnectionless service.
8.Briefly explain the use of flow control in communication network.
9.What is random access protocol ? Give examples.
10.Define unicast and multicast physical address.
11.What is routing ? Give the classification of routing algorithms.
12.Briefly explain the functions of a packet switch.

SECTION-B

Answer any five questions. Each question carries five marks. (5*5=25)
13.Briefly explain about ARPANET.
14.Explain any two TCP/IP application layer protocol.
15.Compare Analog and Digital transmissions.
16.Sketch the signal waveforms when 110101 are transmitted in the following signal codes
a) Unipolar b) Polar NRZ.
17.Explain briefly, with a figure, stop-and-wait ARQ.
18.Briefly explain about point-to-point protocol.
19.Explain the features of FDDI.
20.Explain the Working of a packet Switched network.

SECTION-C

Answer any three questions. Each question carries fifteen marks. (15*3=45)
21. a) Briefly explain the key factors in communication network evolution. [mark 5+10]
b)Explain the OSI reference model,listing the functions of each layer.

22. a) Explain the internal structure of optical fibre cable.List the advantages of Optical fibres over copper cables. [mark 8+7]
b) Explain CRC method of error detection .Give an example.

23.a) Explain time division switches.
b) What is the disadvantage of Go-Back-N protocol ? Explain how it is overcome in Selective repeat protocol. [mark 5+10]

24.a) Explain CSMA/CD protocol.
b) What is channelization ? List the 3 Types of Channelizarion schemes. Explain any one. [mark 7+8]

25.a) Explain with a neat figure 802.3 frame format.
b) Compare link state routing and distace vector routing. [mark 10+5]