and 4 others joined a min ago.
0
477views
Computer Networks Question Paper - Dec 17 - Computer Engineering (Semester 5) - Pune University (PU)
1 Answer
0
0views
written 6.9 years ago by
teamques10
★ 70k
|
Computer Networks - Dec 17
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.
Difference between TCP/IP and OSI reference model.
(4 marks)
00
1.b.
Represent 101011100 using Manchester and differential Manchester line coding technique.
(4 marks)
00
1.c.
Draw flowchart of CSMA/CA.
(2 marks)
00
OR
2.a.
Explain in brief: FHSS and DSSS.
(6 marks)
00
2.b.
Explain fiber optic modes of propagation.
(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.
A slotted ALOHA network transmits 200-bit frames using a shared
channel with a 200-kbps bandwidth. Find the throughput if the system (All stations together) produces
(4 marks)
00
i)1000 frames per second
ii)500 frames per second
OR
4.a.
Explain selective repeat ARQ in detail.
(5 marks)
00
4.b.
A bit stream 1001101 is transmitted using an hamming code. Show the
actual bit string transmitted. Suppose 7th bit from left is inverted during
transmission, show that this error is detected and corrected at the receiver's end.
(5 marks)
00
5.a.
An organization is granted the block 130.34.12.64/26. The organization
needs to have four subnets with equal number of addresses in each
subnet. What are the subnet addresses and the range of addresses for
each subnet?
(6 marks)
00
5.b.
What are general techniques to improve quality of service? Explain any one in detail.
(6 marks)
00
5.c.
Draw and explain IPV6 header. Explain the significance of extension header.
(6 marks)
00
OR
6.a.
A host with P address 130.23.3.20 and physical address B23455102210
has a packet to send to another host with IP address 130.23.43.25 and
physical address A46EF45983AB. The two hosts are on the same Ethernet
network. Show the ARP request and reply packéts encapsulated in
Ethernet frames.
(4 marks)
00
6.b.
Write short notes on
(8 marks)
00
i) NAT
ii) IMCP
6.c.
Explain Distance Vector RoutingAlgorithm? Consider topology given in
fig.(a) and Vectors received from router J's four neighbors are given in
fig (b). Calculate New routing table for router J using Distance Vector
Routing Algorithm.
(6 marks)
00
7.a.
What causes Silly Window syndrome? How it is avoided? Explain.
(4 marks)
00
7.b.
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 system data packets are 2,000 bits in length, what is the utilization percentage of the link?
(4 marks)
00
7.c.
For each of the following applications, determine whether TCP or UDP is used as the transport layer protocol and explain the reason for your choice.
(8 marks)
00
i) Watching a real time streamed video.
ii) Web browsing
iii) A voice over IP(VolP) telephone video.
iv) YouTube video.
OR
8.a.
What are the types of socket? Explain Various socket primitives used in connection oriented client server approach.
(8 marks)
00
8.b.
Explain UDP Header. Below is an Hexadecimal dump of an UDP datagram captured.
(8 marks)
00
e2 a7 00 OD 00 20 74 9e 0e ff00 00 00 01 00 00 00 00 00 00 06 69 73 61 74 61 70 00 00 01 00 01.
i) What is source port number?
ii) What is destination port number?
iii) What is total length of the user datagram?
iv)What is the length of data?
v) Is packet directed from a client to server or vice versa?
9.a.
What is the difference between persistent and non persistent HTTP? Explain HTTP request and reply message format.
(6 marks)
00
9.b.
Write short notes on
(5 marks)
00
i) DHCP.
ii) MIME
9.c.
Explain DNS message format.
(4 marks)
00
OR
10.a.
Explain FTP. Can we specify file transfer in a Web page? Explain with the help of suitable example.
(8 marks)
00
10.b.
Browsers have a in-built caching mechanism for a better user experience.
How do websitesindicate f a web resource needs to be cached or not?
(8 marks)
00
Show HTTP messages in transit for both ScenarioS.
ADD COMMENT
EDIT
Please log in to add an answer.