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Friday, May 29, 2009

PGDCA (IInd Semester) Examination, 2009 Data Communication & Networks Paper III

PGDCA (IInd Semester)
Examination, 2009
Data Communication & Networks
Paper III

Note : Attempt question No. 1 which is compulsory (carries 14 marks) and any other 4 questions from the rest (carrying 9 marks each). 5 questions are to be answered in all

1 (a)Explain Ethernet. What are the differences between Thicknet and Thinnet? (3)
(b)Explain the functions of network protocols. (3)
(c) Explain the differences between synchronous and asynchronous communication. (2)
(d) What is a token? With the help of suitable example show a message is passed in any token ring network. (6)

2 (a)Compare the various modulation techniques. (4)
(b)Explain the differences between a networked environment and a distributed computing environment. (5)

3 (a)Explain how can you connect a node to any LAN.
(b)Explain the differences between implementation issues in LAN and WAN.

4 (a)What is IP in TCP/IP? What is its utility? (4)
(b)Explain the differences between the various IP classes. (5)

5 (a)Compare IPv4 with IPv6. (4)
(b)What is sub-netting? What are its advantages? Explain with an example. (5)

6 (a)Why do we multiplex the signal? Explain. (3)
(b)What is the difference between baseband and broadband communication? (3)
(c) Explain the difference between circuit switching, message switching and packet switching. (3)

7 (a)Explain the differences between active devices and passive devices used in a network. Name them mentioning their utility. (3)
(b)Why do we modulate the signal? Name the various modulation techniques and explain the differences between them. (3)
(c) Explain the usage of modem. What are its functions? (3)

8. Write short notes on any two of the following : (4.5 x 2)
(i) WAN components
(ii) Types of Networks
(iii) Firewall

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