Computer Networks 1 - Jun 2015

Computer Science Engg. (Semester 5)

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. 1 (a) What is data communication? What are the five components of data communication system?(6 marks) 1 (b) Explain the OSI reference model, listing the functions of each layer in brief.(10 marks) 1 (c) What are the four level of address used in internet employing TCP/IP.(4 marks) 2 (a) Using Shannon's theorem compute the maximum bit rate fro a channel having a bend width of 3100 H₂ and signal to noise ratio of 20 db.(6 marks) 2 (b) Sketch the signal waveforms when 01001110 is transmit using following line coding schemes i) R₂ ii) NRZ-L iii) Manchester coding.(6 marks) 2 (c) Explain different types of transmission modes.(8 marks) 3 (a) Four 1 -kbps connections are multiplexed together a unit is 1 bit. Find (i) the duration of 1-bit before multiplexing (ii) the duration of a timeslot, (iii) the duration a frame.(6 marks) 3 (b) Define direct sequence spread spectrum (DSSS) and explain how it achiever band with spread using relevant sketch.(8 marks) 3 (c) What is virtual circuit network? List the five characteristics of the same.(6 marks) 4 (a) Given the data word 1001 and divisor 1011
i) Show the generation code word at the sender site
ii) Show the checking of code word at the receiver site (assume no error).(10 marks) 4 (b) Explain process of error detection and error detection using block coding.(6 marks) 4 (c) What is internet check sum? List the steps under taken by sender to calculate check sum.1ss.(4 marks) 5 (a) With neat diagram of point-to point protocol (PPP) frame format, explain each of the fields.(8 marks) 5 (b) Explain stop and wait automatic repeat request protocol.(6 marks) 5 (c) What is framing? With necessary sketches explain bit stuffing and unstuffing.(6 marks) 6 (a) With neat diagram explain TDMA.(6 marks) 6 (b) Mention different categories of standard Ethernet and explain implementation of 10 base 5-thick Ethernet.(8 marks) 6 (c) Mention the goals of fast Ethernet. And give the importance of 'AUTONEGOTIATION'.(6 marks) 7 (a) What is blue tooth? Explain its architecture.(6 marks) 7 (b) Explain the following connecting devices:
1) Hub
2) Bridge
3) Router
4) Gateway(8 marks) 8 (a) List the deficiencies of IPV4 and advantages of IPV6 over IPV4.(10 marks) 8 (b) Draw format of an IPV6 datagram and explain.(10 marks)