10CS64: COMPUTER NETWORKS - II

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1 QUESTION BANK 10CS64: COMPUTER NETWORKS - II Part A Unit 1 & 2: Packet-Switching Networks 1 and Packet-Switching Networks 2 1. Mention different types of network services? Explain the same. 2. Difference between datagrams and virtual circuits. 3. Define NAT 4. Differentiate between intra domains and inter domain networks. 5. Explain NAP with an example. 6. Explain connectionless packet switching. show how the minimum delay incurred when a message transmitted is 3τ+3T 7. Explain virtual circuit packet switching. 8. Compare the operations of the layer 3 entities in the end systems and in the routers inside the network. 9. Explain why the distance in hops from your ISP to a NAP is very important. What happens if a NAP becomes congested? 10. Explain 8x8 banyan switching. 11. Mention the goals of routing algorithms. 12. Explain Hierarchical Routing. 13. Explain Bellman-Ford Algorithm. 14. Differentiate between Link-State Routing and Distance Vector Routing. 15. Explain briefly different types of routing algorithms. 16. What is Flooding? 17. Explain Dijkstra s Algorithm. 18. How to provide QoS to ATM Networks? 19. Explain the difference between the leaky bucket traffic shaper and the token bucket traffic shaper. 20. Which are the parameters in the upper bound for the peer to peer delay are controllable by the application. 21. What happens as the bit rate of the transmission links becomes very large 22. Consider network in the figure below i) Use the Dijkstra Algorithm to find the shortest path from node 4 to other node. ii) Find the set of associated routing table entries.

2 . Unit 3 & Unit 4 TCP/IP-1 and TCP/IP-2 1. Explain TCP/IP architecture with a neat diagram. 2. Explain IP packet header 3. Explain different IP addressing schemes. 4. What is CIDR? 5. Explain ARP and RARP. 6. Differentiate between ARP and RARP. 7. What is the purpose of ICMP 8. Explain IPv6 header format with neat diagram 9. What isi) Unicast Addressing ii) Multicast Addressing iii) Anycast Addressing 10. Differentiate between TCP and UDP 11. Explain three-way handshaking. 12. Explain the concept of congestion window in TCP congestion control. 13. Different categories of autonomous systems. 14. What is RIP? 15. Differentiate between BGP and UGP. 16. Explain i) DHCP ii) NAT iii) Mobile IP PART B

3 Unit 5 Applications, Network Management, Network Security 1. What are the responsibilities of network administrator? 2. What is the necessity of network management? 3. Describe the network management model by ISO. 4. What is the goal of security management? 5. Explain and justify the architecture of network management system with an analogy. 6. Explain the role played by MIB. 7. List the roles played by the network management protocol. 8. Compare and contrast simple network management and Internet Management. 9. Explain SMI. 10. Explain the hierarchy of Object Identifier tree. 11. Describe SNMP in request-response mode. 12. Explain SNMP PDU format. 13. Justify the suitability of SNMP over UDP. 14. List and explain different types of PDUs. 15. Why do we need a command generator in SNMP applications? 16. Explain the matured architecture of SNMP. 17. Explain the generation and processing of SNMP PDUs 18. Explain the support of SNMP towards security. 19. Is a network manager benefit from network management tools? Describe 5 scenarios. 20. What are the 5 areas of network management defined by ISO? 21. What is the difference between network management and service management? 22. Define the following. 23. a. Managing Entity. b. Managed device 24. c. Management Agent d. Management Protocol 25. Explain trap message in SNMP. 26. What is meant by SNMP engine? 27. Write the application of cryptography to security. 28. What is secret key cryptography? 29. Explain IPSec 30. Give the format of Authentication Header. 31. Explain DES Algorithm 32. Explain RSA Algorithm. Unit 6 QoS, VPNs, Tunneling, Overlay Networks

4 1. Give the overview of QoS methods in integrated services. 2. Explain the leaky bucket traffic shaping algorithm with state diagram and algorithm. 3. Explain Token Bucket Traffic Shaping 4. Differentiate between leaky bucket and token bucket traffic shaping. 5. What is RSVP? 6. Give the overview of a packet scheduler. 7. What are the different types of scheduler? Explain. 8. Give the overview of Differentiated Services QoS in detail. 9. Distinguish betweeni) Fixed versus Adaptive ii) Window Based versus Rate Based iii) Router Based versus Host Based 10. Explain cell scheduling and QoS 11. Suppose that four flows are processed in a router that accepts only equal-size packets. Packets in these flows arrive at the following virtual clock times: Flow 1: 4, 5, 6, 7, 9 Flow 2: 1, 6, 9, 12, 14 Flow 3: 1, 4, 8, 10, 12 Flow 4: 2, 4, 5, 6, 12 a. For each packet, give the virtual clock count at which it is transmitted, using fair queuing. If the arrival times of two packets are the same, the smaller flow number is selected. b. Now consider weighted fair queuing, whereby flows 1, 2, 3, and 4 are given 10 percent, 20 percent, 30 percent, and 40 percent of the output capacity, respectively. For each packet, give the virtual clock count at which it is transmitted. 12. Each output port processor unit of a router has four inputs designated to four different flows. The unit receives the packets in the following order during a period in which the output port is busy but all queues are empty. Give the order in which the packets are transmitted. Flow:1, 1, 1, 1, 1, 1, 2, 2, 3, 3, 3, 4 Packet: 1, 2, 3, 4, 5, 6, 7,8, 9, 10, 11, 12 Packet size: 110, 110, 110, 100, 100, 100, 100, 200, 200, 240, 240, 240 a. Assume a fair queuing scheduler. b. Assume a weighted fair-queuing scheduler with flow i {1, 2, 3, 4} having weights ω i {10%, 20%, 30%, 40%} of the output capacity, respectively Unit 7 Multimedia Networking

5 1. What is data compression? 2. What is signal sampling? 3. Explain the JPEG compression method and still image processing 4. Explain the session initiation protocol 5. Explain in brief SIP. 6. State and explain quantization and encoding. 7. What is motion image? Explain in detail MPEG compression 8. Write in detail i) Limits of compression with loss. ii) Compression methods without loss. 9. What are the different files in Raw Image Sampling and DCT? 10. Give the limits of compression with loss. 11. What is Huffman Encoding? 12. Explain the different types of encoding in Compression Methods Without Loss. 13. Explain in brief the structure of a SCTP packet. 14. What is Fax Process Algorithm? 15. Short note on VOIP signaling protocols. 16. What are the factors that affect QOS of VOIP. 17. Design a Lempel-Ziv encoder for the following source sequence: Unit-8 Mobile Adoch Networks and Wireless Sensor Networks 1. With an example, Explain the dynamic source routing protocol 2. List the security issues in Adhoc networks. Explain the types of attacks 3. What are Adhoc networks? Mention their applications types and unique features. 4. Explain the structure of a typical sensor node. 5. What are the advantages of the DEEP clustering protocol? 6. Explain the following i) CGSR of AD-hoc networks ii) Types of attack in Ad-hoc Networks. 7. Write a short note on Zigbee technology. 8. Briefly explain direct and multi hop routing of intra cluster routing protocol with the help of relevant diagram. 9. State and explain the classification of routing protocols used in Adhoc network. 10. Explain table driven protocol DSDV. 11. Short notes on the following a) WRP b)dsr 12. What are the three rules; packets used by TORA and explain the concept of TORA. 13. Distinguish between AODV and ABR protocols. 14. Explain security of adhoc networks and various types of attacks. 15. What are properties to be possessed by routing protocol to prevent attacks and vulnerability. 16. What is sensor network? Explain clustering in Sensor networks. 17. State and explain the block diagram of a typical wireless sensor node. 18. Explain communication energy model. 19. What do clustering protocols specify? Explain any one clustering protocol in detail. 20. Write Algorithm for Deep clustering.

6 21. Distinguish between centralized routing and distributed routing. 22. Distinguish and explain intra and inter routing protocols. 23. What is a) Stateless mode b) Soft-state mode? 24. List the disadvantages of DSR routing? 25. What is LEACH routing algorithm? 26. List the functions of IEEE physical layer.

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