VTU Computer Networks 1 - December 2011 Exam Question Paper

VTU Computer Science (Semester 5)
Computer Networks 1
December 2011

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) What is data communication?Explain the functional characterstic on which effectiveness of data communication.

6 M

1 (b) Differentive between LAN ,Wan and MAN.

4 M

1 (c) Explain the OSI reference model for computer netwaorks.

10 M

2 (a) What are the factors on which data rate depends in data communication ?

4 M

2 (b) Explain the different causes for transmission impairments during signal trasmiission through media

4 M

2 (c) Explain with a neat diagram,the components of a PCM encoder

6 M

3 (a) With the help of a neat diagram,explain the ASK,FSK and PSK.Discuss the bandwidth requirements in each case

10 M

3 (b) What a spread spectrum? Explain the following techniques for spread spectrum:FHSS and DSSS

10 M

4 (a) Explain the principle of optical fiber communication. Disscuss the advantages and disadvantages of optical fiber.

6 M

4 (b) Obtain the CRC code word using geneator polynominal g(x)=x³+x+1, for the data[100]. Give the hardware reliazation of CRC divisor

8 M

4 (c) With the help of an example ,expalin the computation of internet chcksum.Explain how the error detection is done ,using internet checksum.

6 M

5 (a) Explain with the help of example ,the concepts of bit stuffing and byte stuffing

6 M

5 (b) Explain step and wait ARQ protocol,With the help of a neat diagram

8 M

5 (c) Explain the frame formats and control fields for different types of HDLC frames

6 M

6 (a) An ALOHA networks transmit 200 bit frame on a shread channel of 20kbs.If the system produces 1000 frames per second,obtain the throughout

6 M

6 (b) What is CSMA? Explain the different persistance method of CSMA.

6 M

6 (c) Explain the 802.3 MAC frame format

8 M

7 (a ) Explain the different persistance method in IEEE 802.11

10 M

7 (b) Write a short note on :
TDD TDMA
irtual LAN

10 M

8 (a) Explain w.r.t SONET ,the following :
SONET layers
Sonet frame formate
STS multiplexing

12 M

8 (b) Explain w.r.t Atm,the following:-
ATM network architecture
ATM frame formats

8 M

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