CS – 68: COMPUTER NETWORKS
Time: 3 hours Maximum Marks: 75
Note: Question number 1 is compulsory. Answer any three questions from the rest.
1. (a) Why would an application use UDP instead of TCP? (2)
(b) What is the, difference between packet and frame? (3)
(c) How is the data fragmented and again reassembled in TCP /IP? (5)
(d) Which layer of OSI protocol handles the “error correction and detection”? Explain all functions of this layer. (4)
(e) Differentiate between Baseband and Broadband coaxial cable (4)
(f) What is congestion? How is congestion controlled by TCP / IP? (5)
(g) How are the Switches and Hubs different? List at least five differences. (5)
(h) Describe the term Baud Rate. (2)
2. (a) Differentiate between transparent and source routing bridges (4)
(b) How do the layers of the TCP / IP protocols suite correlate to the layers of the OSI model? (6)
(c) What is Gateway? How do X - 25 gateways link hosts and LANs? Explain. (5)
3. (a) Compare and contrast CSMA / CD and token passing access methods. (4)
(b) What is the difference between flow control and congestion control? Also, specify the reason for occurrence of congestion in a network. (6)
(c) What are the main physical topologies used in LANs? Explain the advantage and disadvantage of each. (5)
4. (a) Compare Circuit switching and Packet switching. (4)
(b) How does ATM protocol work? Also, explain the various functions performed by ATM Adaptation layer. Also describe the ATM Cell format. (7)
(c) Explain the purpose of following TCP header parameters: (4)
(i) Windows
(ii) UrgPtr
(iii) Sequence number
(iv) Data offset
5. (a) Which layer of TCP/IP handles “Routing” ? Explain the working of Exterior Gateway Routing Protocol (EGRP) and Open Shortest Path First (OSPF). (5)
(b) Why is multiplexing needed in data communication system? Explain TDM and FDM. (4)
(c) Write short notes on the following: (6)
(i) DNS
(ii) FTP
(iii) RIP
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