Computer Networks - Dec 2014

Electronics & Telecom Engineering (Semester 7)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.

Answer any one question from Q1 and Q2

1 (a) Explain TCP/IP reference model with suitable diagram. Compare OSI reference model with TCP/IP.(10 marks) 1 (b) Give classification of transmission media. Explain any two guided transmission media.(8 marks) 10 (a) List the various open loop and closed loop congestion control techniques. Explain the policies that can prevent the congestion in a network.(8 marks) 10 (b) List the typical QoS parameters in the Transport Layer and explain each one.(8 marks)

Write a short note on:

11 (a) Role of SMTP & POP - 3 server in E-mail.(6 marks)

Answer any one question from Q11 and Q12

11 (b) DNS(6 marks) 11 (c) FTP(6 marks) 12 (a) What are the main responsibilities of Application layer? Explain in brief.(9 marks) 12 (b) How symmetric key & public key is used in cryptography.(9 marks) 2 (a) Explain cable TV network. How cable TV network is used for data transmission with neat diagram.(10 marks) 2 (b) Explain the terms ADSL, VDSL, HDSL and SDSL technology.(8 marks)

Answer any one question from Q3 and Q4

3 (a) Explain simplest protocol and stop & wait ARQ protocol for noiseless channels with suitable diagram.(8 marks) 3 (b) What are the different types of multiple access protocols? Explain controlled access protocol.(8 marks) 4 (a) What are the common standard Ethernet implementations?Explain.(8 marks) 4 (b) What are the different functions of data link layer? Explain different types of framing techniques in detail.(8 marks)

Answer any one question from Q5 and Q6

5 (a) Draw the layer architecture and explain the functions of each layer in Bluetooth.(8 marks) 5 (b) What is backbone network? What are the types of backbone networks? Explain in detail.(8 marks) 6 (a) What is virtual LAN? Explain VLAN with suitable diagram.(8 marks) 6 (b) Draw the layer architecture and explain in detail the function of each ATM layer.(8 marks)

Answer any one question from Q7 and Q8

7 (a) For a given Classful IP address, how will you extract network address and host address? Explain with suitable example?(8 marks) 7 (b) Explain in details ARP, RARP and BOOTP?(8 marks) 8 (a) What is connecting devices? Explain, compare hub & switch.(8 marks) 8 (b) What are advantages of ICMP over IP protocol? Explain ICMP with general frame format.(8 marks)

Answer any one question from Q9 and 10

9 (a) What are the main objectives of transport layer? Explain with neat diagram process to process delivery in transport layer.(8 marks) 9 (b) Compare TCP and UDP. Under what circumstances you will use them?(8 marks)