VTU Computer Networks 1 - June 2014 Exam Question Paper

VTU Computer Science (Semester 5)
Computer Networks 1
June 2014

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?What are the four fundamental characteristic? With a neat diagram ,explain the components of data communicating system.

8 M

1 (b) Assume that five devices are connected in a mesh topology.How many cables are needed? How many ports are needed for each device?

2 M

1 (c) With a neat diagram, explain the functionalities of each layer of OSI reference model.

10 M

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

6 M

2 (b) Define bandwidth . A periodic signal has bandwidth of 20Hz.The highest frequecy in 60 Hz .What is the lowest frequency?Draw the spectrum if the signal contain all frequncies of the same amplitude.

4 M

2 (c) What is line coding ?Describe and represent the information sequence "101000110" using biphase and bipolar schemes

10 M

3 (a) What is multiplexing ? Explain with a neat diagram FDM.

8 M

3 (b) What is spread spetrum? Explain with an example direct sequence spred spectrum

8 M

3 (c) With a neat diagram .Explain how message can be sent from one system to another using datgaram networks

8 M

4 (a) Define hamming distance/ expalin simple parity check code C(5,4) with d_min-2 .How many bits can be corrected ?

6 M

4 (b) Find the code word e(x),using CRC for the information d(x)=x³ +1 with generator polynomial t(x)=x^{3^+x+1}

8 M

4 (c) Explain with an example .The computaton of internet checksum.List the step undertaken by the sender and receiver for error detection

6 M

5 (a) Why bit stuffing and byte stuffing are needed? Explain them ,With example

6 M

5 (b) With neat figures ,explain briefly?
GO-back n
Selective repeat ARQ protocol

10 M

5 (c) Expalin the frame formate of PPP protocol

4 M

6 (a) Describe CSMA/CD protocol ,With neat floww diagram

6 M

6 (b) What is channelixation ?Explain CODE division multiple access,With an example

8 M

6 (c) Discuss 802.3 MAC frame formate and frame length

6 M

7 (a ) Explain the different Types of addressing mechanism in IEEE 802.11

6 M

7 (b) With neat diagram ,Explain layers of bluetooth.

6 M

7 (c) What is bridge? Explain with an example the bridge learning and forwarding process transparent bridge.

8 M

8 (a) Explain the following fields in IPV4 packet headr:
Identifiaction
Flags
Framention offset

6 M

8 (b) What is NAT ?How can NAT help in deplation with a neat diagram

6 M

8 (c) What is the need to change from IPV4 to IPV6? Write IPV^ basic header and describe fields

8 M

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