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Computer Communication Network Question Paper - Dec 18 - Electronics Engineering (Semester 6) - Mumbai University (MU)
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Computer Communication Network - Dec 18

Electronics Engineering (Semester 6)

TAKEN FROM CREDIT BASED PATTERN

Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.

1.a. In Go-Back-N ARQ, the size of the send window must be less than $2^m$. Justify.
(5 marks) 10001

1.b. Compare the performance characteristics of co-axial, twisted pair and fiber optics transmission.
(5 marks) 11992

1.c. Explain the different classes of IP addresses. Identify the class of the following IP addresses and give their default subnet masks:

(a) 227.56.83.0

(b) 114.22.43.21

(c) 129.14.12.1

(5 marks) 10006

1.d. What is the difference between congestion control & flow control?
(5 marks) 10018

1.e. What are the propagation time and transmission time for 2.5 kbyte message (an e-mail) if the bandwidth of the network is 1 Gbps? Assume that the distance between the sender and the receiver is 12,000 km and that light travels at $2.4 \times 10^8 m/s$. Comment on the result.
(5 marks) 00

2.a. What is DSL technology? Explain various DSL technologies & compare them.
(10 marks) 9989

2.b. Draw the OSI layer architecture. Explain the function of each layer and show the path of actual & virtual communication between the layers.
(10 marks) 9981

3.a. Explain CSMA/CD & its use. What part of 802 Project uses CSMA/CD?
(10 marks) 9997

3.b. Identify class of following IP addresses:

  • i) 200.58.20.165
  • ii) 128.167.23.20

Also perform CIDR Aggregation of following

  • i) 200.96.87.0 /22
  • ii) 128.56.24.0 /22
(10 marks) 10010

4.a. Apply Dijkstras and Bellman Fords algorithm to the given network as shown in fig and find at least the cost path between source node 1 to all other nodes.
(10 marks) 10007

4.b.i. Compare TCP and UDP
(5 marks) 10287

4.b.ii. SMTP and HTTP
(5 marks) 10016

5.a. With reference to HDLC protocol, explain the following:

  • i) HDLC frame format
  • ii) Data transfer modes
  • iii) Different HDLC frames
  • iv) Importance of P/F bit
  • v) Balanced & Unbalanced configurations
(10 marks) 10002

5.b. Explain the following network connecting devices -

  • i) Switch
  • ii) Router
  • iii) Gateway
  • iv) Bridge -v) Hub
(10 marks) 9990

6. Write short note on (Any four)

6.a. Data flow and Data communication components
(5 marks) 00

6.b. Design Issues for the layers
(5 marks) 00

6.c. RIP
(5 marks) 00

6.d. DNS
(5 marks) 10017

6.e. FDDI
(5 marks) 00

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