: 000 0701 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fifth Semester B.Tech Degree Regular and Supplementary Examination December 2020

Course Code: IT307
Course Name: Computer Networks

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 a) Compare and contrast the various guided transmission media? (5)

b) Explain with a neat diagram, the reference model which is being used in the (5)
current scenario?
c) Describe about bridges, the layer where it appears and its use? (5)
2 a) Explain the working of stop n wait protocol in detail (5)
b) With the help of an example, explain the method of error correction using (10)
Hamming code?
3 9) A bit stream 1101011011 is transmitted using the standard CRC method. The (5)
generator polynomial is ധി. What is the actual bit string transmitted?
0) Explain the context in which Selective Repeat protocol is preferred over Go back (3)
n protocol and vice-versa
c) Describe briefly about the classification of communication satellites and its uses? (7)

PART B
Answer any two full questions, each carries 15 marks.

4 a) Explain about Exponential Back off algorithm and its relevance? (5)
b) State the scenario in which slotted Aloha outperforms pure Aloha and what are (5)
the major attributes that contribute towards this?

c) What is count-to-infinity problem and state the routing protocol which gives rise (5)

to this?
5 ച What is random early detection? (5)
b) Describe the working of link state routing with the help of an example network? (10)
6 a) State Optimality Principle and its importance in routing? (4)

b) Why is dynamic channel allocation preferred over static allocation? Explain (5)
suitable examples?

Page 1 of 2