Seminar Topics - Scholarships - Admission/Entrance Exam Notifications USA-UK-Australia-Germany-France-NewZealand Universities List Engineering-MBA-MCA-Medical-Pharmacy-B.Ed-Law Colleges Information www.andhracolleges.com The Complete I nformation About Col leges i n Andhra Pradesh www.andhracolleges.com Code No: RR410402 Set No. 1 IV B.T ech I Semeste r Reg ula r Exa mi nat ion s, No vember 2006 COMPUTER NETWORKS ( Common to Electronics & Communication Engineering, Electronics & Instrumentation Engineering, Bio-Medical Engineering and Electronics & Telematics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆ ⋆ ⋆ ⋆ ⋆ 1. (a) List two advan tages and tw o disadv antages of havin g inte rnatio nal standar ds for network, Protocols? (b) With a neat diagram, expla in the functio nalit y of laye rs, protocols and inter- faces. [8+8] 2. (a) Given 1101011011 data frame and generator polynomial G(x) = x 4 + x + 1, derive the transmitted frame. (b) What is pipe lin ing? Wit h an example, explain Go back -n slidi ng window protocol. [8+8] 3. (a) Expl ain WDMA p rot ocol. (b) Explain wireless LAN protocol. [8+8] 4. (a) What is floodin g? Wha t are t he v ariations of fl ooding? (b) What are the problem whic h caused demise of distanc e vector routing? Ex- plain the algorithm that replaced it? [8+8] 5. (a) Imagine that a two-way handshake rather than a thre e-w ay handsh ake 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) Datagra m fragme ntation and reass embly are handle d 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) Briefl y disc uss about co nnection less In tern et wor king. (b) Explain firewalls, packet filter and a proxy in detail. [8+8] 7. (a) Can AAL 1 handle me ssage s shorter than 40 bytes using the s ch eme with the Pointer field? Explain your answer. (b) AAL 3/4 allows mult iple 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 sinlg e AAL 3/4 cell? [6+6+4] 1 of 2
www.andhracolleges.com The Complete Information About Colleges in Andhra Pradesh
www.andhracolleges.com
Code No: RR410402 Set No. 1
IV B.Tech I Semester Regular Examinations, November 2006COMPUTER NETWORKS
( Common to Electronics & Communication Engineering, Electronics &Instrumentation Engineering, Bio-Medical Engineering and Electronics &
Telematics)
Time: 3 hours Max Marks: 80Answer any FIVE QuestionsAll Questions carry equal marks
⋆ ⋆ ⋆ ⋆ ⋆
1. (a) List two advantages and two disadvantages of having international standardsfor network, Protocols?
(b) With a neat diagram, explain the functionality of layers, protocols and inter-faces. [8+8]
2. (a) Given 1101011011 data frame and generator polynomialG
(x
) =x4
+x
+ 1,derive the transmitted frame.
(b) What is pipelining? With an example, explain Go back-n sliding windowprotocol. [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? Ex-plain the algorithm that replaced it? [8+8]
5. (a) Imagine that a two-way handshake rather than a three-way handshake wereused 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 invisibleto TCP. Does this mean that TCP does not have to worry about data arrivingin 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 thePointer 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 onevirtual circuit has sufficient bandwidth to carry all the traffic.
(c) What is the payload size of the maximum length message that fits in a sinlgeAAL 3/4 cell? [6+6+4]
www.andhracolleges.com The Complete Information About Colleges in Andhra Pradesh
www.andhracolleges.com
Code No: RR410402 Set No. 2
IV B.Tech I Semester Regular Examinations, November 2006COMPUTER NETWORKS
( Common to Electronics & Communication Engineering, Electronics &Instrumentation Engineering, Bio-Medical Engineering and Electronics &
Telematics)
Time: 3 hours Max Marks: 80Answer any FIVE QuestionsAll Questions carry equal marks
⋆ ⋆ ⋆ ⋆ ⋆
1. (a) Write any four reasons for using layered protocols.
(b) List two ways in which the OSI reference model and the TCP/IP referencemodel are the same and list in which they differ.
(c) Which is the principle difference between CO communication and CL commu-nication. [6+4+6]
2. (a) If the bit string 0111101111101111110 is bit stuffed. What is the output of the string?
(b) What is the reminder obtained by dividing x7 + x
5 +1 by the generator x3 + 1.[8+8]
3. (a) Explain the operation of source Routing Bridges.
(b) Measurements of a slotted ALOHA channel with an infinite number of usersshow 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 optimalityprinciple? 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 ispreferred to TCP?
(b) What are blocking calls, primitives and non-blocking primitives? [8+8]
www.andhracolleges.com The Complete Information About Colleges in Andhra Pradesh
www.andhracolleges.com
Code No: RR410402 Set No. 3
IV B.Tech I Semester Regular Examinations, November 2006COMPUTER NETWORKS
( Common to Electronics & Communication Engineering, Electronics &Instrumentation Engineering, Bio-Medical Engineering and Electronics &
Telematics)
Time: 3 hours Max Marks: 80Answer any FIVE QuestionsAll Questions carry equal marks
⋆ ⋆ ⋆ ⋆ ⋆
1. (a) Write any four reasons for using layered protocols.
(b) List two ways in which the OSI reference model and the TCP/IP referencemodel are the same and list in which they differ.
(c) Which is the principle difference between CO communication and CL commu-nication. [6+4+6]
2. (a) With an example, explain the importance of sequence number for Acknowl-edgements.
(b) Frames of 1000 bits are sent over a 1-Mbps-satellite channel. Acknowledge-ments are always piggybacked onto data frames. The headers are very short.Three-bit sequence numbers are used. What is the maximum achievable chan-nel 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 trans-missions as soon as they detect a collision? [8+8]
4. What is Routing Algorithm? What are the classification of it? What is optimalityprinciple? 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 towin?
(b) Suppose that the clock-driven scheme for generating initial sequence numbersis used with a 15-bit wide clock counter. The clock ticks once every 100msec,and the maximum packet lifetime is 60sec. How often need resynchronizationtake 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 ensurethat not only the packet, but also its acknowledgements, have vanished?
www.andhracolleges.com The Complete Information About Colleges in Andhra Pradesh
www andhracolleges com
Code No: RR410402 Set No. 4
IV B.Tech I Semester Regular Examinations, November 2006COMPUTER NETWORKS
( Common to Electronics & Communication Engineering, Electronics &Instrumentation Engineering, Bio-Medical Engineering and Electronics &
Telematics)
Time: 3 hours Max Marks: 80Answer any FIVE QuestionsAll Questions carry equal marks
⋆ ⋆ ⋆ ⋆ ⋆
1. (a) Write any four reasons for using layered protocols.
(b) List two ways in which the OSI reference model and the TCP/IP referencemodel are the same and list in which they differ.
(c) Which is the principle difference between CO communication and CL commu-nication. [6+4+6]
2. (a) Given 1101011011 data frame and generator polynomial G(x) = x4 + x + 1,derive the transmitted frame.
(b) What is pipelining? With an example, explain Go back-n sliding windowprotocol. [8+8]
3. (a) What is time domain reflectometry? Write about 802.3 cabling.
(b) Draw and Explain 802.3 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 arrivingin 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 badlycongested 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 arrivingin the wrong order? [6+6+4]
8. (a) What is public key cryptography? With an example, Explain RSA Algorithm.
