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Computer Networks Question Paper - Jun 18 - Computer Engineering (Semester 5) - Pune University (PU)
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Computer Networks - Jun 18
Computer Engineering (Semester 5)
Total marks: 70
Total time: 2 Hours 30 min
INSTRUCTIONS
(1) Neat diagram must be drawn whenever necessary.
(2) Figures to the right side indicate full marks.
(3) Calculator is allowed.
(4) Assume suitable data if necessary.
1(a)
Define TCP/IP model.
(4 marks)
00
1.b.
A line has a signal-to-noise ratio of 1000 and bandwidth of 4000khz. What is the maximum data rate supported by this line.
(3 marks)
00
1.c.
Write short note on CSMA/CD.
(3 marks)
00
OR
2.a.
Explain in brief : FHSS and DHSS.
(6 marks)
00
2.b.
Explain PPP format.
(4 marks)
00
3.a.
Explain control field of HDLC w.r.t I-frame , S-frame and U-frame.
(6 marks)
00
3.b.
Calculate the throughput for stop-and wait protocol,if the frame size is
4800 bits,bit rate is 9600 bps, within distance 2000 km with speed of propagation 200000 km/s.
(4 marks)
00
OR
4.a.
Explain GO back N ARQ in detail.
(5 marks)
00
4.b.
Explain Bluetooth 802.15 format in detail.
(5 marks)
00
5.a.
A small organisation is given a block with the beginning address and the prefix length 205.16.37.24/29(in slash notation). What is the range of the block.
(4 marks)
00
5.b.
What are general techniques to improve quality of service? Explain any one in detail.
(8 marks)
00
5.c.
Draw and explain IPV4 Header .
(4 marks)
00
OR
6.a.
Write short notes on:
(12 marks)
00
i) Address Resolution Protocol (ARP)
ii) Network Address Translation(NAT)
iii) Internet Control Message Protocol (ICMP)
6.b.
Explain link state Routing Algorithm with example.
(4 marks)
00
7.a.
What causes Silly Window syndrome?How it is avoided?
(6 marks)
00
7.b.
In a Stop-and-Wait system, the bandwidth of the line is 2 Mbps, and
1 bit takes 20 milliseconds to make a round trip. What is the bandwidth-
delay product? If the syśtem data packets are 2,000 bits in length, what
is the utilization percentage ofthe link?
(6 marks)
00
7.c.
Explain TCP Header in detail.
(6 marks)
00
OR
8.a.
What are the types of socket? Explain Various socket primitives used in connection oriented client server approach.
(10 marks)
00
8.b.
Explain UDP Header ? Below is an Hexadecimal dump of an UDP datagram captured.
(8 marks)
00
06 32 00 0D 00 1C E2 17
i) what is the source port number?
ii) what is the destination port number ?
iii) what is the length of the data?
iv) is packet directed from a client to server or vice versa?
9.a.
Explain HTTP request and reply message format iwth example.
(6 marks)
00
9.b.
Write short notes on
(6 marks)
00
i)DHCP
ii)SMTP
9.c.
Explain DNS message format.
(4 marks)
00
OR
10.a.
Explain FTP in detail. Explain any four FTP commands.
(8 marks)
00
10.b.
Browsers have a in-built caching mechanism for a better user experience. How do website indicates if a web resource needs to be cached or not?
(8 marks)
00
Shows HTTP message in transit for both scenarios.
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