3. (a) Explain WDMA protocol. (b) Explain wireless LAN protocol. [8+8]

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Collin Horace Jones
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1 Code No: RR Set No (a) List two advantages and two disadvantages of having international standards for network, Protocols? (b) With a neat diagram, explain the functionality of layers, protocols and interfaces. [8+8] 2. (a) Given data frame and generator polynomial G(x) = x 4 + x + 1, derive the transmitted frame. (b) What is pipelining? With an example, explain Go back-n sliding window protocol. [8+8] 3. (a) Explain WDMA protocol. (b) Explain wireless LAN protocol. [8+8] 4. (a) What is flooding? What are the variations of flooding? (b) What are the problem which caused demise of distance vector routing? Explain the algorithm that replaced it? [8+8] 5. (a) Imagine that a two-way handshake rather than a three-way handshake were used to set up connections. In other words, the third message was not required. Are deadlocks now possible? Give an example or show that none exist. (b) Datagram fragmentation and reassembly are handled by IP and are invisible to TCP. Does this mean that TCP does not have to worry about data arriving in the wrong order? [8+8] 6. (a) Briefly discuss about connection less Internetworking. (b) Explain firewalls, packet filter and a proxy in detail. [8+8] 7. (a) Can AAL 1 handle messages shorter than 40 bytes using the scheme with the Pointer field? Explain your answer. (b) AAL 3/4 allows multiple sessions to be multiplexed onto a single virtual circuit. Give an example of a situation in which that has no value. Assume that one virtual circuit has sufficient bandwidth to carry all the traffic. (c) What is the payload size of the maximum length message that fits in a sinlge AAL 3/4 cell? [6+6+4] 1 of 2

2 Code No: RR Set No (a) What is SNMP? Briefly discuss the SNMP model components. (b) What is ? Briefly discuss about the User Agent. [8+8] 2 of 2

3 Code No: RR Set No (a) Write any four reasons for using layered protocols. (b) List two ways in which the OSI reference model and the TCP/IP reference model are the same and list in which they differ. (c) Which is the principle difference between CO communication and CL communication. [6+4+6] 2. (a) If the bit string is bit stuffed. What is the output of the string? (b) What is the reminder obtained by dividing x 7 +x 5 +1 by the generator x [8+8] 3. (a) Explain the operation of source Routing Bridges. (b) Measurements of a slotted ALOHA channel with an infinite number of users show that 10 percent of the slots are idle. i. What is the channel load, G? ii. What is the throughput? iii. Is the channel under loaded or overloaded? [8+8] 4. What is Routing Algorithm? What are the classification of it? What is optimality principle? With an example, explain shortest path Routing Algorithm. [16] 5. (a) Explain Berkeley socket primitives for TCP. (b) Briefly explain the concept of Addressing in TL. [8+8] 6. (a) Briefly discuss about the ways network can differ. (b) Explain in detail Firewall operation. [8+8] 7. (a) Give the format of UDP segment and TCP segment? Explain when UDP is preferred to TCP? (b) What are blocking calls, primitives and non-blocking primitives? [8+8] 8. (a) Explain in detail methods of DES chaining. (b) Briefly discuss about IDEA. [8+8] 1 of 1

4 Code No: RR Set No (a) Write any four reasons for using layered protocols. (b) List two ways in which the OSI reference model and the TCP/IP reference model are the same and list in which they differ. (c) Which is the principle difference between CO communication and CL communication. [6+4+6] 2. (a) With an example, explain the importance of sequence number for Acknowledgements. (b) Frames of 1000 bits are sent over a 1-Mbps-satellite channel. Acknowledgements are always piggybacked onto data frames. The headers are very short. Three-bit sequence numbers are used. What is the maximum achievable channel utilization for i. Stop-and-wait ii. Go-back n. iii. Selective repeat. [8+8] 3. (a) Compare pure Aloha and slotted aloha in detail. (b) Explain the multiple access protocol using which the stations about their transmissions as soon as they detect a collision? [8+8] 4. What is Routing Algorithm? What are the classification of it? What is optimality principle? With an example, explain shortest path Routing Algorithm. [16] 5. (a) Imagine a generalized n-army problem, in which the agreement of any two of the armies is sufficient for victory. Does a protocol exist that allows blue to win? (b) Suppose that the clock-driven scheme for generating initial sequence numbers is used with a 15-bit wide clock counter. The clock ticks once every 100msec, and the maximum packet lifetime is 60sec. How often need resynchronization take place i. in the worst case? ii. when the data consumes 240 sequence numbers/min? (c) Why does the maximum packet lifetime, T, have to be large enough to ensure that not only the packet, but also its acknowledgements, have vanished? [6+6+4] 1 of 2

5 Code No: RR Set No (a) What is tunneling? Can tunneling be used in datagram subnets? If so, how? (b) With an example, explain Address resolution protocol. [8+8] 7. (a) Briefly discuss the differences between AAL protocols. (b) Why does UDP exist? Would it not have been enough to just let user processes send raw IP packets? [8+8] 8. (a) What is DNS? Briefly discuss DNS Namespace. (b) Explain, in detail principal DNS resource record types. [8+8] 2 of 2

6 Code No: RR Set No (a) Write any four reasons for using layered protocols. (b) List two ways in which the OSI reference model and the TCP/IP reference model are the same and list in which they differ. (c) Which is the principle difference between CO communication and CL communication. [6+4+6] 2. (a) Given data frame and generator polynomial G(x) = x 4 + x + 1, derive the transmitted frame. (b) What is pipelining? With an example, explain Go back-n sliding window protocol. [8+8] 3. (a) What is time domain reflectometry? Write about cabling. (b) Draw and Explain frame format. [8+8] 4. (a) Briefly write about Network Layer design issues. (b) Compare and contrast datagram Vs Virtual circuit subnets. [8+8] 5. (a) Briefly discuss about Transport Layer quality of service parameters. (b) Datagram fragmentation and reassembly are handled by IP and are invisible to TCP. Does this mean that TCP does not have to worry about data arriving in the wrong order? [8+8] 6. (a) What is tunneling? When it is used? Is it used in wireless LAN s? (b) Explain firewalls, packet filter and a proxy in detail. [8+8] 7. (a) Give a potential disadvantage when Nagle s algorithm is used on a badly congested network. (b) Are deadlocks possible with the transport entity? If so, how? Suggest a solution to overcome the deadlock. (c) Datagram fragmentation and reassembly are handled by IP and are invisible to TCP. Does this mean that TCP does not have to worry about data arriving in the wrong order? [6+6+4] 8. (a) What is public key cryptography? With an example, Explain RSA Algorithm. (b) Explain Diffie-Hellman key exchange Authentication protocol. [8+8] 1 of 1

Code No: RR Set No. 1

Code No: RR Set No. 1 Code No: RR410402 Set No. 1 1. (a) Write any four reasons for using layered protocols. (b) List two ways in which the OSI reference model and the TCP/IP reference model are the same and list in which they