Cs 68
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The document is a past exam paper for a computer networks course. It contains 7 questions testing various topics in computer networks: 1) Token bus and token ring operation, factors causing network congestion, sliding window protocol explanation, data communication types (simplex, half-duplex, full-duplex), functions of the encryption layer in the OSI model, and differences between bit rate and baud rate. 2) Differences between LAN, MAN and WAN, LAN topologies, how RARP resolves MAC to IP addresses compared to ARP, differences between unicast, multicast and broadcast. 3) Why flow control is handled at two OSI layers, features of those layers, purpose of multiplexing
Cs 68
- 1. No. of Printed Pages : 3 CS-68 N BACHELOR IN COMPUTER APPLICATIONS Term-End Examination O June, 2011 CS-68 : COMPUTER NETWORKS Time : 3 hours Maximum Marks : 60 Note : Question No. 1 is compulsory. Attempt any two questions from the rest. 1. (a) Explain the working of token bus and token 5 ring when a station accepts the token and then crashes immediately. (b) What are the important factors which can 3 cause congestion in Computer Network ? (c) Explain the working of Sliding Window 5 Protocol using an example. (d) Differentiate between simplex, half duplex 6 and full duplex data communication. Also, give one example of each. (e) Which layer of CSI model handles 4 "Encryption" ? Explain any three important functions of this layer. (f) Define and differentiate between bit rate 2 and baud rate. CS-68 1 P.T.O.
- 2. (g) Explain the concept of circuit switching and 5 packet switching. Also, state which one is better for voice communication and why ? 2. (a) How does LAN differs from MAN and 6. WAN ? Explain briefly about different physical topologies used in LAN. (b) How does RARP resolves MAC address to 6 an IP address ? Also, write how it differs from ARP. (c) Differentiate between unicast, multicast and 3 broadcast. 3. (a) Explain, why flow control is handled at two 7 different layers of OSI ? Name and list two other important features of these layers. (b) What is the purpose of multiplexing in data 8 communication ? Define and differentiate between TDM and FDM with the help of a suitable diagram for each. 4. (a) Draw and describe different fields of ATM 7 Cell format. Also, list various functions performed by ATM Adaptation layer. (b) Compare between source routing and 4 transparent bridges. (c) Explain the Count - to - infinity problem and 4 solution in distance vector routing. CS-68 2
- 3. 5. (a) What is Hub Explain the purpose of hub, 7 switches and gateways in Computer Networks. (b) Explain the role and purpose of following 8 fields of TCP header. (i) Data offset (ii) Sequence Number (iii) Acknowledgement (iv) Window CS-68 3