SKR Engineering College 2006 B.E Electronics & Tele-Communication Engineering COMPUTER COMMUNICATION & NETWORKS - Question Paper

VI SEMESTER
B.E. ELECTRONICS AND COMMUNICATION ENGINEERING
EC343 - COMPUTER COMMUNICATION & NETWORKS

Time:Three Hours Maximum: 100 Marks

ans All ques.

PART – A (10 x two = 20 Marks)

1.Explain the difference ranging from asynchronous and synchronous transmission modes.

2.What are the fault correcting capabilities of CRC – 16?

3.In what situation would you recommend statistical multiplexing? discuss.

4.Which of the ISO layer handles every of the following:
(a) Breaking the transmitted bit streams into frames.
(b) Routing a packet from 1 node to a different.
(c) Providing synchronization points and
(d) Encryption and decryption.

5.Illustrate the operation of a bridge ranging from 2 LAN segments and provide its functions.

6.Differentiate ranging from connectionless and connection oriented services in Data networks.

7.Describe the merits and demerits of flooding technique in data networks.

8.When do you apply bit stuffing? If a bit string 011100111111101 is subjected to bit stuffing. What would be the output string?

9.List the transmission used in data networks and compare them.

10.What do you understand by M/D/n queue? discuss.

PART – B (5 x 16 = 80 Marks)

11.Explain the ISO-OSI 7 layer network architecture giving the functions of every layer.

12.a)Compare and discuss the subsequent IEEE-802 MAC layer protocols.
(i) CSMA/CD bus (ii) Token ring and (iii) Token bus

(OR)

12.b)What do you understand by RS232C/V.24 data interface? discuss the handshaking procedure of the above interface?

13.a)Derive the expressions for link utilization of
(i) Stop and wait and (ii) Sliding window ARQ protocols.

(OR)

13.b)Explain Transmission Control Protocol (TCP) by giving the functions of every header in the frame format. Also compare M/G/1 queuing system.

14.a)For M/M/1 queuing systems, find the expressions for total waiting time and the total number of customers. Also discuss M/G/1 queuing system.

(OR)

14.b)Distinguish ranging from random and fixed media access protocols. Derive expressions for throughout for pure and slotted ALOHA protocols and discuss.

15.a)Give the characteristics and elements of routing techniques for packet switching networks and discuss. Also discuss random routing technique.

(OR)

15.b)Write notes on the following:
(i) Public Key Cryptography (ii) Priority queuing systems.

Earning:   Approval pending.