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Posted By: Hari Prasad P Member Level: Bronze Posted Date: 30 May 2008
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2007 Vellore Institute of Technology MS Software Engineering Data Communication and Computer Networking University Question paper
VIT U N I V E R S I T Y
School of Computing Sciences
Term End Arrear Examination – April 2007
M.S. (Software Engineering) – IV Semester
Batch: [2002, 2003 & 2004]
Subject: Data Communication and computer Networks
Time: Three Hours Max Marks:100
PART – A (20 X 2 = 40 Marks)
Answer ALL the Questions
1. Compare dejure standard and defacto standard.
2. Give a disadvantage of each type topology.
3. Why was OSI model developed?
4. A periodic composite signal with a bandwidth of 3000Hz is composed of two sinne waves. The first one has a frequency of 500Hz with a maximum of 30 Volts and the second one has a maximum of 10 Volts. Draw the frequency spectrum.
5. What is handoff in cellular telephony?
6. What is inverse multiplexing?
7. Calculate the VRC and LRC for the following bit pattern using even parity:
0011101 1100111 1111111 0000000.
8. In a stop and wait ARQ, what happened if a NAK is lot in transit? Why there is no need for NAKS to be numbered?
9. Using BSC, show the sequence of frames for the following scenario between two computers in a point-to-point configuration:
a) Computer a tasks permission from computer B to send data.
b) Computer b responds positively
c) Computer a sends three frames, each consisting of 4 blocks of 400 bytes.
d) Computer b acknowledges the receipt.
10. Compare TSI to a TDM Bus.
11. How a repeater is different from a amplifier?
12. In HDLC what is bit shifting and why it is needed?
13. What are the fields in TDPU?
14. find the netid and hostid of the following IP addresses
a) 129.14.6.8
b) 225.23.34.12.
15. Compare IPV4 and IPV6.
16. What is multi casting?
17. Why is client server programs is finite and the server program infinite?
18. What is the purpose of domain name system?
19. Mention the five types of message in RTCP.
20. List any three multimedia applications.
PART-B (5 X 12 = 60 Marks)
Answer All the Questions
21. (a) With a diagram explain the responsibilities of different layers in internet model. [12]
OR
21. (b) (i) Discuss the two popular approaches of packet switching. Compare circuit and packet switching. [8]
(ii) Assume a data is made of 01001110. Encode this stream using the following encoding schemes. [4]
(a) Unipolar
(b) Differential Manchester.
22. (a) (i) Explain how the sliding window protocol of window size seven is working. [6]
(ii) How does a taken ring LAN operate? [6]
OR
22. (b) (i) Discuss about the different types of frames in HDLC with next diagram. [9]
(ii)The code 10011100101 was received using the hamming encoding algorithm. What is the original code send? [3]
23. (a) (i) Explain the distance vector algorithm with an example. [8]
(ii) Discuss the following two internet control protocols. [4]
(a) ICMP
(b) RARP.
OR
23. (b) Discuss the primitives and issues of IPV6 [12]
24. (a) Discuss the duties of transport layer in detail. [12]
OR
24. (b) Draw the frame format and explain the following protocols [12]
(i)UDP
(ii)TCP.
25. (a) Discuss the following internet application [12]
(i) FTP
(ii) DNS
(iii)TELNET.
OR
25. (b) Discuss the two protocols used in multimedia networking [12]
(i) RTSP
(ii) RTP.
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