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COMPUTER NETWORKS

1. a) Compare the OSI model with TCP/IP model.
b) Explain the frame relay and give its importance compared to X.25 [8+8]
2. a) What are the various layers of ATM standard and explain the their functions.
b) What are the advantages of fiber optics over the copper wire? [8+8]
3. a) What are the services provided to the network layer by data link layer.
b) What is the bit stuffing? Explain its importance. [8+8]
4. a) What is the importance of error control and flow control?
b) Derive an expression for the throughput of the pure ALOHA. [8+8]
5. a) Compare the various multiple access protocols.
b) What are the functions of network layer? [8+8]
6. a) What is congestion?
b) Explain any one of the congestion control algorithms. [8+8]
7. a) What are the primitives for a simple transport service? Explain.
b) What is the difference between the data link and transport layers?
c) In a network that has a maximum TPDU size of 128 bytes, a maximum TPDU lifetime of 30 sec, and an 8-bit sequence number, what is the maximum data rate per connection? [16]
8. Write short notes on:
a) Electronic mail
b) Network security
c) Multimedia. [16]
* * * * * *
1. a) What are the services provided to the network layer by data link layer.
b) What is the bit stuffing? Explain its importance. [8+8]
2. a) What is the importance of error control and flow control?
b) Derive an expression for the throughput of the pure ALOHA. [8+8]
3. a) Compare the various multiple access protocols.
b) What are the functions of network layer? [8+8]
4. a) What is congestion?
b) Explain any one of the congestion control algorithms. [8+8]
5. a) What are the primitives for a simple transport service? Explain.
b) What is the difference between the data link and transport layers?
c) In a network that has a maximum TPDU size of 128 bytes, a maximum TPDU lifetime of 30 sec, and an 8-bit sequence number, what is the maximum data rate per connection? [16]
6. Write short notes on:
a) Electronic mail
b) Network security
c) Multimedia. [16]
7. a) Compare the OSI model with TCP/IP model.
b) Explain the frame relay and give its importance compared to X.25 [8+8]
8. a) What are the various layers of ATM standard and explain the their functions.
b) What are the advantages of fiber optics over the copper wire? [8+8]
* * * * * *

1. a) Compare the various multiple access protocols.
b) What are the functions of network layer? [8+8]
2. a) What is congestion?
b) Explain any one of the congestion control algorithms. [8+8]
3. a) What are the primitives for a simple transport service? Explain.
b) What is the difference between the data link and transport layers?
c) In a network that has a maximum TPDU size of 128 bytes, a maximum TPDU lifetime of 30 sec, and an 8-bit sequence number, what is the maximum data rate per connection? [16]
4. Write short notes on:
a) Electronic mail
b) Network security
c) Multimedia. [16]
5. a) Compare the OSI model with TCP/IP model.
b) Explain the frame relay and give its importance compared to X.25 [8+8]
6. a) What are the various layers of ATM standard and explain the their functions.
b) What are the advantages of fiber optics over the copper wire? [8+8]
7. a) What are the services provided to the network layer by data link layer.
b) What is the bit stuffing? Explain its importance. [8+8]
8. a) What is the importance of error control and flow control?
b) Derive an expression for the throughput of the pure ALOHA. [8+8]

1. a) What are the primitives for a simple transport service? Explain.
b) What is the difference between the data link and transport layers?
c) In a network that has a maximum TPDU size of 128 bytes, a maximum TPDU lifetime of 30 sec, and an 8-bit sequence number, what is the maximum data rate per connection? [16]
2. Write short notes on:
a) Electronic mail
b) Network security
c) Multimedia. [16]
3. a) Compare the OSI model with TCP/IP model.
b) Explain the frame relay and give its importance compared to X.25 [8+8]
4. a) What are the various layers of ATM standard and explain the their functions.
b) What are the advantages of fiber optics over the copper wire? [8+8]
5. a) What are the services provided to the network layer by data link layer.
b) What is the bit stuffing? Explain its importance. [8+8]
6. a) What is the importance of error control and flow control?
b) Derive an expression for the throughput of the pure ALOHA. [8+8]
7. a) Compare the various multiple access protocols.
b) What are the functions of network layer? [8+8]
8. a) What is congestion?
b) Explain any one of the congestion control algorithms. [8+8]
* * * * * *
1.a) Explain one bit sliding window protocol and discuss its merits and demerits.
b) What are the services provided to network layer by data link layer? [16]
2.a) What is the remember obtained by dividing 751xx++ by the generator polynomial ? 31x+
b) Data link protocol almost always put the CRC in a trailer, rather than in a header. Why? [16]
3.a) What are the functions of medium access control layers protocol? Explain.
b) What are the various IEEE standards for Local Area Networks? [16]
4.a) Discuss the various issues of network layer.
b) What is congestion control? Explain the congestion control algorithm. [16]
5.a) What are various transport services? Explain.
b) Compare dynamic and static routing algorithm. [16]
6.a) Draw the TCP segment head and explain.
b) Compare TCP and UDP protocols. [16]
7.a) Explain the ATM adaptation layer and its sub layers.
b) Explain window management in TCP with an example. [16]
8. Write short notes on:
a) DNS
b) Electronic mail
c) Multimedia. [16]
* * * * * *
1.a) What are the functions of medium access control layers protocol? Explain.
b) What are the various IEEE standards for Local Area Networks? [16]
2.a) Discuss the various issues of network layer.
b) What is congestion control? Explain the congestion control algorithm. [16]
3.a) What are various transport services? Explain.
b) Compare dynamic and static routing algorithm. [16]
4.a) Draw the TCP segment head and explain.
b) Compare TCP and UDP protocols. [16]
5.a) Explain the ATM adaptation layer and its sub layers.
b) Explain window management in TCP with an example. [16]
6. Write short notes on:
a) DNS
b) Electronic mail
c) Multimedia. [16]
7.a) Explain one bit sliding window protocol and discuss its merits and demerits.
b) What are the services provided to network layer by data link layer? [16]
8.a) What is the remember obtained by dividing 751xx++ by the generator polynomial ? 31x+
b) Data link protocol almost always put the CRC in a trailer, rather than in a header. Why? [16]
* * * * * *
1.a) What are various transport services? Explain.
b) Compare dynamic and static routing algorithm. [16]
2.a) Draw the TCP segment head and explain.
b) Compare TCP and UDP protocols. [16]
3.a) Explain the ATM adaptation layer and its sub layers.
b) Explain window management in TCP with an example. [16]
4. Write short notes on:
a) DNS
b) Electronic mail
c) Multimedia. [16]
5.a) Explain one bit sliding window protocol and discuss its merits and demerits.
b) What are the services provided to network layer by data link layer? [16]
6.a) What is the remember obtained by dividing 751xx++ by the generator polynomial ? 31x+
b) Data link protocol almost always put the CRC in a trailer, rather than in a header. Why? [16]
7.a) What are the functions of medium access control layers protocol? Explain.
b) What are the various IEEE standards for Local Area Networks? [16]
8.a) Discuss the various issues of network layer.
b) What is congestion control? Explain the congestion control algorithm. [16]
* * * * * *
1.a) Explain the ATM adaptation layer and its sub layers.
b) Explain window management in TCP with an example. [16]
2. Write short notes on:
a) DNS
b) Electronic mail
c) Multimedia. [16]
3.a) Explain one bit sliding window protocol and discuss its merits and demerits.
b) What are the services provided to network layer by data link layer? [16]
4.a) What is the remember obtained by dividing 751xx++ by the generator polynomial ? 31x+
b) Data link protocol almost always put the CRC in a trailer, rather than in a header. Why? [16]
5.a) What are the functions of medium access control layers protocol? Explain.
b) What are the various IEEE standards for Local Area Networks? [16]
6.a) Discuss the various issues of network layer.
b) What is congestion control? Explain the congestion control algorithm. [16]
7.a) What are various transport services? Explain.
b) Compare dynamic and static routing algorithm. [16]
8.a) Draw the TCP segment head and explain.
b) Compare TCP and UDP protocols. [16]
* * * * * *

1. (a) In a token bus LAN how a new node is added.
(b) Compare and contrast transparent and source routing bridges. [8+8]
2. (a) What are the header elds in TCP segment header that are required for
ow
control & congestion control? Explain how these elds are used for
ow control
and congestion control?
(b) What are the header elds in TCP segment header that are required for error
control? What are the limitations of it? [8+8]
3. (a) If a binary signal is sent over a 3KHz channel whose signal to noise ratio is
20dB. What is the maximum achievable data rate?
(b) Which switching method allows real-time data transfer. Mention the advan-
tages of packet switching. [8+8]
4. (a) Consider an error-free 64 kbps satellite channel used to send 512 byte data
frames in one direction, with very short acknowledgements coming back the
other way. What is the maximum throughput for window sizes 1,7,15 and
127?
(b) What is pipelining? What are its advantages? What are the issues that raises
when pipelining frames over an unreliable communication channel? Mention
the approaches to deal with these errors. [8+8]
5. (a) How POP works? What are the advantages of IMAP over POP?
(b) What is the role played by message transfer agent? Explain. [6+10]
6. (a) Any V.C. subnet delivers packets in order, but why Datagram subnet fails to
deliver packets in order.
(b) For request-reply type of service which one is preferred connection oriented
service/connection less service. Why?
(c) Among VC Subnet and datagram subnet, which one maintains state informa-
tion and why? [6+5+5]
7. (a) Give a detailed description of the Novell Netware IPX packet.
(b) Compare connection less and connection oriented services with suitable exam-
ples. [8+8]
8. (a) Why IPv6 uses extended headers. Explain di erent IPv6 extension headers?
(b) What are the advantages of IPv6 over IPv4? [10+6]
* * * * * *

1. (a) Give a detailed description of the Novell Netware IPX packet.
(b) Compare connection less and connection oriented services with suitable exam-
ples. [8+8]
2. (a) Why IPv6 uses extended headers. Explain di erent IPv6 extension headers?
(b) What are the advantages of IPv6 over IPv4? [10+6]
3. (a) What are the header elds in TCP segment header that are required for
ow
control & congestion control? Explain how these elds are used for
ow control
and congestion control?
(b) What are the header elds in TCP segment header that are required for error
control? What are the limitations of it? [8+8]
4. (a) Any V.C. subnet delivers packets in order, but why Datagram subnet fails to
deliver packets in order.
(b) For request-reply type of service which one is preferred connection oriented
service/connection less service. Why?
(c) Among VC Subnet and datagram subnet, which one maintains state informa-
tion and why? [6+5+5]
5. (a) In a token bus LAN how a new node is added.
(b) Compare and contrast transparent and source routing bridges. [8+8]
6. (a) How POP works? What are the advantages of IMAP over POP?
(b) What is the role played by message transfer agent? Explain. [6+10]
7. (a) Consider an error-free 64 kbps satellite channel used to send 512 byte data
frames in one direction, with very short acknowledgements coming back the
other way. What is the maximum throughput for window sizes 1,7,15 and
127?
(b) What is pipelining? What are its advantages? What are the issues that raises
when pipelining frames over an unreliable communication channel? Mention
the approaches to deal with these errors. [8+8]
8. (a) If a binary signal is sent over a 3KHz channel whose signal to noise ratio is
20dB. What is the maximum achievable data rate?
(b) Which switching method allows real-time data transfer. Mention the advan-
tages of packet switching. [8+8]
* * * * * *

1. (a) Any V.C. subnet delivers packets in order, but why Datagram subnet fails to
deliver packets in order.
(b) For request-reply type of service which one is preferred connection oriented
service/connection less service. Why?
(c) Among VC Subnet and datagram subnet, which one maintains state informa-
tion and why? [6+5+5]
2. (a) Consider an error-free 64 kbps satellite channel used to send 512 byte data
frames in one direction, with very short acknowledgements coming back the
other way. What is the maximum throughput for window sizes 1,7,15 and
127?
(b) What is pipelining? What are its advantages? What are the issues that raises
when pipelining frames over an unreliable communication channel? Mention
the approaches to deal with these errors. [8+8]
3. (a) Give a detailed description of the Novell Netware IPX packet.
(b) Compare connection less and connection oriented services with suitable exam-
ples. [8+8]
4. (a) Why IPv6 uses extended headers. Explain di erent IPv6 extension headers?
(b) What are the advantages of IPv6 over IPv4? [10+6]
5. (a) If a binary signal is sent over a 3KHz channel whose signal to noise ratio is
20dB. What is the maximum achievable data rate?
(b) Which switching method allows real-time data transfer. Mention the advan-
tages of packet switching. [8+8]
6. (a) How POP works? What are the advantages of IMAP over POP?
(b) What is the role played by message transfer agent? Explain. [6+10]
7. (a) In a token bus LAN how a new node is added.
(b) Compare and contrast transparent and source routing bridges. [8+8]
8. (a) What are the header elds in TCP segment header that are required for
ow
control & congestion control? Explain how these elds are used for
ow control
and congestion control?
(b) What are the header elds in TCP segment header that are required for error
control? What are the limitations of it? [8+8]
* * * * * *
1. (a) Why IPv6 uses extended headers. Explain di erent IPv6 extension headers?
(b) What are the advantages of IPv6 over IPv4? [10+6]
2. (a) Any V.C. subnet delivers packets in order, but why Datagram subnet fails to
deliver packets in order.
(b) For request-reply type of service which one is preferred connection oriented
service/connection less service. Why?
(c) Among VC Subnet and datagram subnet, which one maintains state informa-
tion and why? [6+5+5]
3. (a) How POP works? What are the advantages of IMAP over POP?
(b) What is the role played by message transfer agent? Explain. [6+10]
4. (a) If a binary signal is sent over a 3KHz channel whose signal to noise ratio is
20dB. What is the maximum achievable data rate?
(b) Which switching method allows real-time data transfer. Mention the advan-
tages of packet switching. [8+8]
5. (a) What are the header elds in TCP segment header that are required for
ow
control & congestion control? Explain how these elds are used for
ow control
and congestion control?
(b) What are the header elds in TCP segment header that are required for error
control? What are the limitations of it? [8+8]
6. (a) In a token bus LAN how a new node is added.
(b) Compare and contrast transparent and source routing bridges. [8+8]
7. (a) Give a detailed description of the Novell Netware IPX packet.
(b) Compare connection less and connection oriented services with suitable exam-
ples. [8+8]
8. (a) Consider an error-free 64 kbps satellite channel used to send 512 byte data
frames in one direction, with very short acknowledgements coming back the
other way. What is the maximum throughput for window sizes 1,7,15 and
127
(b) What is pipelining? What are its advantages? What are the issues that raises
when pipelining frames over an unreliable communication channel? Mention
the approaches to deal with these errors. [8+8]
* * * * * *


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