Jawaharlal Nehru Technological University Hyderabad 2011-3rd Year B.Tech Computer Science and Engineering (CCC) s- DATA COMMUNICATION AND COMPUTER NETWORKS - Question Paper

Code No: CS414
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
B.Tech (CCC) III Year exams February - 2011
DATA COMMUNICATION AND COMPUTER NETWORKS
(Computer Science Engineering)
Time: three Hours Max.Marks:100
ans Any 5 ques.
All ques. Carry Equal Marks
- - -
1.a) explain different network topologies and discuss their functionality.
b) What is the difference ranging from fault detection and fault correction techniques? What is
the use of checksum? [10+10]

2.a) provide the HDLC frame format for the following?
i. info transfer
ii. Supervisory and unnumbered frame.
b) With a neat diagram discuss data-link establishment phase in bisync protocol. [10+10]
3.a) provide short notes on asynchronous TDM.
b) Compare RZ and NRZ transmission techniques with necessary signal representation.
[10+10]
4.a) discuss the design aspects of hierarchical networks.
b) discuss ISO-OSI architecture in detail. [10+10]

5.a) discuss go back to n and pipe lining window protocols.
b) discuss about fault handling methods in data link layer. [10+10]
6.a) discuss about flooding. Where is it used?
b) discuss about hierarchical routing. [10+10]

7.a) discuss about the time of the day service.
b) discuss about different classes of addressing. [10+10]
8.a) discuss the 4 fundamental principals of network security.
b) With a block diagram discuss the principle of cryptography. [10+10]

Earning:   Approval pending.