VTU Computer Science (Semester 5)
Computer Networks 1
December 2012
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 protocol? Define the key elements of protocol ?
5 M
1 (b) Define network topology ,Explain ring topology with advantages and disadvantages
5 M
1 (c) Explain the different levels of addressing used in an internet with a suitable example for each level of addresing in TCP/IP ?
10 M

2 (a) Explain the following:
Bandwidth
Through put
Transmission time
Latency
Jitter
5 M
2 (b) Explain with the block diagram the cause for transmission inpairmainrts .
9 M
2 (c) Explian with neat waveform any two polar line coding schemes
6 M

3 (a) What is multiplexing ? Explain with a neat diagram FDM.
8 M
3 (b) Explain how time- divison - multiplexing difffers from FDM ,With a neat diagram?
4 M
3 (c) What is switching ? Differentiate circuit switch network with packet -Switched network
8 M

4 (a) What is internet checksum? List the steps udertaken by sneder and receivar for error detection.
6 M
4 (b) Expalin with an example of block coding method for error detection and correction ?
10 M
4 (c) What is the hamming distance ? Find the minimum hamming distance of the coding scheme show in the table
Data word Code word
0 0 0 0 0 0 0

0

1 0 1 0 1 1
1 0 1 0 1 0 1
1 1 1 1 1 1 0

4 M

5 (a) Calculate the time to send 2 milion bits of dat in a system the uses stop and wait protocols .If the distance between sender and receiver is 2000km .Assume packet size 400bits and propagation speed is 2 ×108m.no data or control frame is lost
10 M
5 (b) Explain the frame formats and transmitional phase of point -to -point protocol
10 M

6 (a) Explain why colllision in an random access protocol but in controllled acess or channelizing protocol?
4 M
6 (b) Explain any two popular control access method ,With a neat diagram
8 M
6 (c) Explain 802.3 MAC frame formate
8 M

7 (a ) Explain the service of IEEE 802.11 standard
4 M
7 (b) Write a short note on:
Blue tooth
Celleular telehone
10 M
7 (c) Explain the five standard of Imt -2000radio -interface of 3G system?
6 M

8 (a) Expalin briefly the advantages of IPV6
6 M
8 (b) Find the metid and hostid of the following IP address?
111.64.2.6
131.57.9.3
207 .64.52.11
225.34.2.1
8 M
8 (c) Write short note on network addreess translation (NAT)
6 M



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