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Posted By: srinivasa rao Member Level: Silver Posted Date: 19 Dec 2007
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2007 Jawaharlal Nehru Technological University B.Tech Electronics & Communications Engineering Computer Networks Question paper
Code No: RR410402 Set No. 1
IV B.Tech I Semester Regular Examinations, November 2007
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) Compare and contrast OSI and TCP/IP models.
(b) Draw and explain in detail about ISO-OSI reference model. [8+8]
2. (a) The following data fragment occurs in the middle of a data stream for which
the character-stuffing algorithm described in the text is used: DLE, STX, A,
DLE, B, DLE, ETX. What is the output after stuffing?
(b) When bit stuffing is used, is it possible for the loss, insertion, or modification
of a single bit to cause an error not detected by the checksum? If not, why
not? If so, how? Does the checksum length play a role here?
(c) Data link protocols almost always put the CRC in a trailer, rather than in a
header. Why? [6+6+4]
3. (a) Explain five key Assumptions in Dynamic channel allocation in LANs and
MANs.
(b) Explain the multiple access protocol using which the stations about their trans-
missions as soon as they detect a collision? [8+8]
4. (a) What are the problem which caused demise of distance vector routing? Ex-
plain the algorithm that replaced it?
(b) With an example, explain Distance Vector Routing algorithm? [8+8]
5. (a) Explain Berkeley socket primitives for TCP.
(b) Briefly explain the concept of Addressing in TL. [8+8]
6. (a) Briefly discuss about Internet work Routing.
(b) Briefly discuss about Fragmentation. [8+8]
7. (a) Can AAL 1 handle messages shorter than 40 bytes using the scheme with the
Pointer field? Explain your answer.
(b) Suppose that you are measuring the time to receive a TPDU. When an inter-
rupt occurs, you read out the system clock in milliseconds. When the TPDU
is fully processed, you read out the clock again. You measure 0 msec 270,000
times and 1 msec 7,30,000 times. How long does it take to receive a TPDU?
(c) What is the payload size of the maximum length message that fits in a single
AAL 3/4 cell? [6+6+4]
1 of 2
Code No: RR410402 Set No. 1
8. (a) What is “Quantization noise”? Briefly discuss about MIDI.
(b) Draw and explain the Hardware architecture of video server. [8+8]
? ? ? ? ?
Code No: RR410402 Set No. 2
IV B.Tech I Semester Regular Examinations, November 2007
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) 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 commu-
nication. [6+4+6]
2. (a) What is SLIP? What are the disadvantages of it?
(b) With an example, explain the importance of sequence numbers for Acknowl-
edgements. [8+8]
3. (a) Explain the Binary exponential back off algorithm.
(b) Write about 802.3 performance. [8+8]
4. (a) Give three examples of protocol parameters that might be negotiated when a
connection is set up.
(b) Are there any circumstances when a virtual circuit service will (or at least
should) deliver packets out of order? Explain.
(c) Assuming that all routers and hosts are working properly and that all software
in both is free of all errors, is there any chance, however small, that a packet
will be delivered to the wrong destination? [6+6+4]
5. (a) What is forbidden region? Explain three-way handshake protocol used for
establishing connection.
(b) Explain in detail Four protocol scenarios for releasing a connection. [8+8]
6. (a) What is tunneling? When it is used? Is it used in wireless LAN’s?
(b) Briefly discuss about Fragmentation. [8+8]
7. (a) What is Nagle’s algorithm? Explain the problem of silly window syndrome:
suggest a solution to this problem.
(b) What are blocking calls, primitives and non-blocking primitives? [8+8]
8. (a) What is Cryptanalysis? Briefly discuss about substitution cipher, transposi-
tion ciphers and one-time pads.
(b) Explain any one secrete key algorithm. [8+8
Code No: RR410402 Set No. 3
IV B.Tech I Semester Regular Examinations, November 2007
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 advantages and two disadvantages of having international standards
for network, Protocols?
(b) With a neat diagram, explain the functionality of layers, protocols and inter-
faces. [8+8]
2. (a) What is SLIP? What are the disadvantages of it?
(b) With an example, explain the importance of sequence numbers for Acknowl-
edgements. [8+8]
3. (a) Explain five key Assumptions in Dynamic channel allocation in LANs and
MANs.
(b) Explain the multiple access protocol using which the stations about their trans-
missions as soon as they detect a collision? [8+8]
4. (a) An ATM network uses a token bucket scheme for traffic shaping. A new token
is put into the bucket every 5 µsec. What is the maximum sustainable net
data rate (i.e., excluding header bits)?
(b) A computer on a 6-Mbps network is regulated by a token bucket. The token
bucket is filled at a rate of 1Mbps. It is initially filled to capacity with 8
megabits. How long can the computer transmit at the full 6 Mbps?
(c) A data gram subnet allows routers to drop packets whenever they need to. The
probability of a router discarding a packet is p. Consider the case of a source
host connected to the source router, which is connected to the destination
router, and then to the destination host. If either of the routers discards a
packet, the source host eventually times out and tries again. If the host-router
and router-router lines are counted as hops, what is the mean number of
i. hops a packet makes per transmission?
ii. transmissions a packet makes?
iii. hops required per received packet? [4+6+6]
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?
Code No: RR410402 Set No. 3
(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]
6. (a) Briefly discuss about Concatenated Virtual Circuits.
(b) Briefly discuss about connection less Internetworking. [8+8]
7. (a) What is Nagle’s algorithm? Explain the problem of silly window syndrome:
suggest a solution to this problem.
(b) Draw and explain the AAL1 cell format, headers and trailers. [8+8]
8. (a) What is SNMP? Briefly discuss the SNMP model components.
(b) What is e-mail? Briefly discuss about the User Agent. [8+8]
? ? ? ? ?
2 of 2
Code No: RR410402 Set No. 4
IV B.Tech I Semester Regular Examinations, November 2007
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 advantages and two disadvantages of having international standards
for network, Protocols?
(b) With a neat diagram, explain the functionality of layers, protocols and inter-
faces. [8+8]
2. (a) Briefly, explain about the DLL design issues.
(b) If the bit string 0111101111101111110 is bit stuffed. What is the output of
the string? [8+8]
3. (a) What is bridge? Explain the operation of a LAN bridge from 802.3 to 802.4.
(b) Explain the operation of transparent bridge. [8+8]
4. (a) A computer on a 6-Mbps network is regulated by a token bucket. The token
bucket is filled at a rate of 1Mbps. It is initially filled to capacity with 8
megabits. How long can the computer transmit at the full 6 Mbps?
(b) Briefly discuss about congestion control in VC subnets. [8+8]
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]
6. (a) What is internet work routing? Explain interior gateway and exterior gateway
protocols.
(b) What is three bears problem? Write short notes on CIDR. [8+8]
1 of 2
Code No: RR410402 Set No. 4
7. (a) What is Nagle’s algorithm? Explain the problem of silly window syndrome:
suggest a solution to this problem.
(b) Draw and explain the AAL1 cell format, headers and trailers. [8+8]
8. (a) What is Cryptanalysis? Briefly discuss about substitution cipher, transposi-
tion ciphers and one-time pads.
(b) Explain any one secrete key algorithm. [8+8]
? ? ? ? ?
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