Panjab University - BCA 3rd Year April 2003
Data Communications and Networks
Time Allowed: 3 Hrs
Maximum Marks: 100
1 (a) What are the various layers in OSI Model? Explain the need for each of them. (14)
(b) Compare OSI reference model with TCP/IP reference model (6)
2 (a) Compare sliding window protocol with stop-and-wait protocol (10)
(b) Compare shortest path routing algorithm with flooding (10)
3 (a) What are the general principles of congestion control? (10)
(b) Explain the various methods of Internet working. Also discuss the different gateways used to establish Internet working. (10)
4 (a) What is switching? Compare the performance of circuit swithing and packet switching. (10)
(b) Write a note on two techniques to ensure Network Security. (10)
5 (a) Explain Dynamic channel allocation assumptions. (10)
(b) Write a note on ‘Remote Login’. (10)
6 (a) Compare the Frequency division and Time division Multiplexing Techniques. (10)
(b) What is ISDN? Write briefly on ISDN services. (10)
7 (a) Write a note on Simple Mail Transfer Protocol. (10)
(b) Write briefly about Broadcast and Multicast Routing techniques. How one differs from the other? (10)
8 (a) Explain the IEEE Standard 802.5 (10)
(b) Explain Network Topology. Describe commonly used network topologies with their relative advantages and disadvantages. (10)
Data Communications and Networks
Time Allowed: 3 Hrs
Maximum Marks: 100
1 (a) What are the various layers in OSI Model? Explain the need for each of them. (14)
(b) Compare OSI reference model with TCP/IP reference model (6)
2 (a) Compare sliding window protocol with stop-and-wait protocol (10)
(b) Compare shortest path routing algorithm with flooding (10)
3 (a) What are the general principles of congestion control? (10)
(b) Explain the various methods of Internet working. Also discuss the different gateways used to establish Internet working. (10)
4 (a) What is switching? Compare the performance of circuit swithing and packet switching. (10)
(b) Write a note on two techniques to ensure Network Security. (10)
5 (a) Explain Dynamic channel allocation assumptions. (10)
(b) Write a note on ‘Remote Login’. (10)
6 (a) Compare the Frequency division and Time division Multiplexing Techniques. (10)
(b) What is ISDN? Write briefly on ISDN services. (10)
7 (a) Write a note on Simple Mail Transfer Protocol. (10)
(b) Write briefly about Broadcast and Multicast Routing techniques. How one differs from the other? (10)
8 (a) Explain the IEEE Standard 802.5 (10)
(b) Explain Network Topology. Describe commonly used network topologies with their relative advantages and disadvantages. (10)