Foundation of Computer Network - Dec 2014

Information Technology Engineering (Semester 4)

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) Write short note on Analog Signals and Digital Signals with the help of waveforms.(6 marks) 1 (b) How is the bandwidth of a signal related to its spectrum?(6 marks) 2 (a) Explain various transmission impairments present in Data Communication.(6 marks) 2 (b) Draw and explain PCM and DM.(6 marks)

Answer any one question from Q3 and Q4

3 (a) Explain Circuit switched network with three phases.(7 marks) 3 (b) Explain in detail backbone networks.(6 marks) 4 (a) Explain various types of Unguided media in detail.(7 marks) 4 (b) Explain different addressing schemes in TCP/IP model.(6 marks)

Answer any one question from Q5 and Q6

5 (a) What is CRC ? Generate the CRC code for message 1101010101. Given generator polynomial g(x) = x⁴ + x² + 1.(6 marks) 5 (b) Explain in detail Stop and Wait and Selective Repeat ARQ System.(6 marks) 6 (a) Explain in detail Go-Back-N and Selective Repeat ARQ System.(6 marks) 6 (b) Explain Error Detection and Correction in Block Coding.(6 marks)

Answer any one question from Q7 and Q8

7 (a) Explain FDMA, TDMA and CDMA in detail.(6 marks) 7 (b) Discuss CSMA/CA random access technique. How is collision avoidance achieved in this technique?(7 marks) 8 (a) Explain CSMA and CSMA/CD. Also comment on the efficiency of each.(6 marks) 8 (b) Discuss Fast Ethernet technology in brief. State its specification.(7 marks)