Cochin University of Science and Techology (CUST) 2005 B.Tech Electronics and Communications Engineering Computer Networks ( ) - Question Paper

Computer Networks (May 2005)

1a. explain ISO-OSI model architecture
b. elaborate peer entities? Also explain the classes of service primitives
c. explain the different application areas of Computer Network
2a. discuss the functions of Network layer and Presentation layer
b. define the difference ranging from broad cast networks and point to point networks
3a. discuss 1 bit sliding window protocol that uses
i) stop and wait
ii) go back n
compare the 2 approaches
b. explain the different fault control schemes employed in data transmission
4a. What is CRC? calculate the check sum for the subsequent message 1101011011 using the generator polynomial x4+x+1
b. What is framing? explain various framing methods used in Data link layer?
c. If the bit string 0 one 1 one 1 one 1 one 1 one 0 one 1 one 1 one 1 0 is subject to bit snuffing, what will be the output string?
5a. explain the difference ranging from adaptive and non adaptive routing algorithms
b. explain the following:
i)CSMA\CD ii)Any 1 congestion control algorithm
6a. explain any 1 IEEE Standard Protocol Developed for LAN Topology.
b. provide X.25 packet format for
i)Call request
ii)Control packet
iii)Data packet
7a. discuss the functions of session layer
b. elaborate the similarities and differences ranging from session and a transport connection
c. What is the need of buffering? discuss
8a. discuss various function of transport layer
b. explain the subsequent
i) Client server model
ii)Remote procedure cell
9a. discuss substitution ciphers and transposition ciphers with example
b. explain virtual terminals in detail
10a.Explain how presentation layer give Network security and privacy
b. Write short notes on:
i) World Wide Web
ii)Cryptography
iii)Telnet

Earning:   Approval pending.