Code No: NR320502

NR

Set No. 2

in

III B.Tech II Semester Examinations,APRIL 2011 COMPUTER NETWORKS Common to Information Technology, Electronics And Computer Engineering, Computer Science And Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Differentiate between transmission path, virtual path and virtual circuit. [6]

[10]

ld .

(b) Explain link state routing with an example.

2. (a) Does the TC sublayer distinguish between different VCs at either the transmitter or receiver? [8]

or

(b) Does the TC sublayer at the transmitter fill in any of the fields in the ATM header? Which ones? [8] 3. (a) What are the principles applied to arrive at the 7 layers of the OSI

[6]

(b) What are the various issues that arise in data link layer of an OSI model and indicate the steps to correct them. [10]

uW

4. (a) Give the algorithm for CRC method of error checking.

[8]

(b) Given 1101011011 data frame and generator polynomial G(x) = x4 + x + 1. Derive the transmitted frame. [8] 5. (a) Explain the operation of Binary count down protocol.

[8]

(b) Explain the operation of limited Contention protocol.

[8]

6. (a) Suppose transmission channels become virtually error free, is the data link layer still needed? Justify your answer. [8]

nt

(b) Explain how the notation of multiplexing can be applied at the data link layer. [8]

7. (a) Explain working of digital signatures with Big Brother.

[5] [5]

(c) Write short notes on digital signatures using Message digests.

[6]

Aj

(b) Draw and explain the Digital signatures using public-key cryptography.

8. (a) Describe flow control?

[8]

(b) 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? [8] ?????

1

Code No: NR320502

NR

Set No. 4

in

III B.Tech II Semester Examinations,APRIL 2011 COMPUTER NETWORKS Common to Information Technology, Electronics And Computer Engineering, Computer Science And Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????

ld .

1. (a) Does the TC sublayer distinguish between different VCs at either the transmitter or receiver? [8]

(b) Does the TC sublayer at the transmitter fill in any of the fields in the ATM header? Which ones? [8] 2. (a) Differentiate between transmission path, virtual path and virtual circuit. [6]

or

(b) Explain link state routing with an example.

[10]

3. (a) Suppose transmission channels become virtually error free, is the data link layer still needed? Justify your answer. [8]

uW

(b) Explain how the notation of multiplexing can be applied at the data link layer.

4. (a) Explain working of digital signatures with Big Brother.

[8] [5]

(b) Draw and explain the Digital signatures using public-key cryptography.

[5]

(c) Write short notes on digital signatures using Message digests.

[6]

5. (a) What are the principles applied to arrive at the 7 layers of the OSI

[6]

nt

(b) What are the various issues that arise in data link layer of an OSI model and indicate the steps to correct them. [10] 6. (a) Describe flow control?

[8]

(b) 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? [8] [8]

(b) Explain the operation of limited Contention protocol.

[8]

Aj

7. (a) Explain the operation of Binary count down protocol.

8. (a) Give the algorithm for CRC method of error checking.

[8]

(b) Given 1101011011 data frame and generator polynomial G(x) = x4 + x + 1. Derive the transmitted frame. [8] ?????

2

Code No: NR320502

NR

Set No. 1

1. (a) Explain working of digital signatures with Big Brother.

in

III B.Tech II Semester Examinations,APRIL 2011 COMPUTER NETWORKS Common to Information Technology, Electronics And Computer Engineering, Computer Science And Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????

[5]

[5]

(c) Write short notes on digital signatures using Message digests.

[6]

ld .

(b) Draw and explain the Digital signatures using public-key cryptography.

2. (a) Describe flow control?

[8]

or

(b) 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? [8] 3. (a) Does the TC sublayer distinguish between different VCs at either the transmitter or receiver? [8]

uW

(b) Does the TC sublayer at the transmitter fill in any of the fields in the ATM header? Which ones? [8] 4. (a) Explain the operation of Binary count down protocol.

[8]

(b) Explain the operation of limited Contention protocol.

[8]

5. (a) Differentiate between transmission path, virtual path and virtual circuit. [6] (b) Explain link state routing with an example.

[10]

nt

6. (a) Suppose transmission channels become virtually error free, is the data link layer still needed? Justify your answer. [8] (b) Explain how the notation of multiplexing can be applied at the data link layer. [8]

7. (a) What are the principles applied to arrive at the 7 layers of the OSI

[6]

Aj

(b) What are the various issues that arise in data link layer of an OSI model and indicate the steps to correct them. [10]

8. (a) Give the algorithm for CRC method of error checking.

[8]

(b) Given 1101011011 data frame and generator polynomial G(x) = x4 + x + 1. Derive the transmitted frame. [8] ?????

3

Code No: NR320502

NR

Set No. 3

in

III B.Tech II Semester Examinations,APRIL 2011 COMPUTER NETWORKS Common to Information Technology, Electronics And Computer Engineering, Computer Science And Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) What are the principles applied to arrive at the 7 layers of the OSI

[6]

ld .

(b) What are the various issues that arise in data link layer of an OSI model and indicate the steps to correct them. [10]

2. (a) Suppose transmission channels become virtually error free, is the data link layer still needed? Justify your answer. [8]

or

(b) Explain how the notation of multiplexing can be applied at the data link layer.

3. (a) Give the algorithm for CRC method of error checking.

[8]

[8]

uW

(b) Given 1101011011 data frame and generator polynomial G(x) = x4 + x + 1. Derive the transmitted frame. [8] 4. (a) Explain the operation of Binary count down protocol.

[8]

(b) Explain the operation of limited Contention protocol.

[8]

5. (a) Describe flow control?

[8]

(b) 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? [8]

nt

6. (a) Does the TC sublayer distinguish between different VCs at either the transmitter or receiver? [8] (b) Does the TC sublayer at the transmitter fill in any of the fields in the ATM header? Which ones? [8]

Aj

7. (a) Differentiate between transmission path, virtual path and virtual circuit. [6] (b) Explain link state routing with an example.

8. (a) Explain working of digital signatures with Big Brother.

[10] [5]

(b) Draw and explain the Digital signatures using public-key cryptography.

[5]

(c) Write short notes on digital signatures using Message digests.

[6]

?????

4

NR Set No. 2

(a) Differentiate between transmission path, virtual path and virtual circuit. [6] · (b) Explain link state routing with an example. [10] · 2. (a) Does the TC sublayer ...
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