Computer Networks - May 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) Compare OSI and TCP/IP network Reference models.(4 marks) 1 (b) What are the different types of addresses exists?(4 marks) 1 (c) Compare Circuit switched networks and Data gram networks.(4 marks) 1 (d) Explain Virtual circuit networks in detail.(4 marks) 10 (a) Explain the different techniques to improve QoS?(6 marks) 10 (b) Explain process to process delivery.(4 marks) 10 (c) Draw and explain the UDP header in detail.(6 marks) 10 (d) Compare TCP v/s UDP.(2 marks)

Answer any one question from Q11 and Q12

11 (a) What is the function of SMTP and POP-3 protocols in Email system? What protocol is used to secure Email communication?(4 marks) 11 (b) Explain the DES algorithm.(4 marks) 11 (c) What is 'WWW'? What is HTML? How to write web page in HTML?(4 marks) 11 (d) Explain the RSA algorithm with suitable example?(4 marks) 12 (a) Write a short note on Authentication of protocols?(4 marks) 12 (b) What is sockets address? Write Socket address of web server and FTP server for class-A, class-B & Class-C Private IPv-4 address.(4 marks) 12 (c) Define Cryptanalysis, Cryptology, Substitution cipher and Transposition cipher.(4 marks) 12 (d) What is DNS? What are three main components of DNS? Can DNS server run on proxy server in your organization? Justify it.(4 marks) 2 (a) Define VDSL, HDSL, SDSL & ADSL.(4 marks) 2 (b) Write a short note on Internet over Cable TV.(4 marks) 2 (c) Compare Guided and Unguided Transmission media.(4 marks) 2 (d) What is Shannon's channel capacity theorem? What is the maximum data rate for a telephone line with BW 3.6 kHz and 35db SNR?(4 marks)

Answer any one question from Q3 and Q4

3 (a) Explain Unicasting, Broadcasting, Multicasting and point to point Networks.(4 marks) 3 (b) Explain the Fast and Gigabit Ethernet networks.(4 marks) 3 (c) Explain any framing technique in detail.(6 marks) 3 (d) Explain any controlled access technique in detail.(4 marks) 4 (a) What are the functions of Data link layer protocol? Draw & Explain HDLC frame format in detail.(6 marks) 4 (b) Explain Selective Repeat ARQ protocol.(6 marks) 4 (c) Explain Bit stuffing in detail? Explain GBN ARQ technique.(6 marks)

Answer any one question from Q5 and Q6

5 (a) Explain Bluetooth Networking in detail. Draw & explain its protocol stack.(8 marks) 5 (b) Write a short note on Backbone networks.(4 marks) 5 (c) Write a short note on Physical layer of IEEE 802.11 networks.(4 marks) 6 (a) Write a short note on Virtual LANs.(6 marks) 6 (b) Write a short note on connecting devices used in Networking.(6 marks) 6 (c) Explain type of switching takes place in ATM networks? Compare ATM networks with Frame relay networks.(4 marks)

Answer any one question from Q7 and Q8

7 (a) Explain routing and routed protocol?(4 marks) 7 (b) Explain the Shortest path routing algorithm in detail.(6 marks) 7 (c) Compare static and dynamic routing algorithm with suitable example.(6 marks) 8 (a) Compare Distance vector routing with Link state routing.(4 marks) 8 (b) Write a short note on ICMP and IGMP protocol.(6 marks) 8 (c) Explain ARP and RARP working with suitable example.(6 marks)

Answer any one question from Q9 and 10

9 (a) What are different transport service primitives? Explain QoS at transport layer. Define delay, congestion, throughput & jitter,(8 marks) 9 (b) Consider a TCP connection is transferring a file of 7000 bytes. The first byte is numbered 11001, what are the sequence numbers for each segment if data are sent in five segments, each carrying 1000 bytes? Draw UDP header format.(2 marks) 9 (c) Draw and explain the TCP header in detail.(8 marks)