LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
M.Sc. DEGREE EXAMINATION – PHYSICS
SECOND SEMESTER – APRIL 2012
PH 2954 – DATA COMMUNICATION & COMPUTER NETWORKS
Date : 24-04-2012 Dept. No. Max. : 100 Marks
Time : 9:00 – 12:00
PART – A
Answer ALL questions: (10×2=20)
- Differentiate half duplex and full duplex data exchange
- Write a note on Cross talk.
- Define transmission time and propagation time in a communication system.
- Explain the two link configuration defined by HDLC.
- Enumerate the types of Network in Network Hardware.
- Give some examples for Network.
- Write an algorithm for computing the checksum in error detecting mechanism.
- What is meant by Optimality principle?
- Write a note on Hypertext Transfer Protocol.
- Enumerate the functions supported by e-mail system.
PART – B
Answer any FOUR questions: (4×7.5 = 30)
- Explain the advantages of Fibre optical cable over other media.
- Describe the techniques i) NRZ-L and ii) NRZI to encode digital data into digital signals.
- Explain briefly (a) Stop-and-wait flow control and (b) Sliding-window flow control.
- Outline the general principles of Local Area Network (LAN), Metropolitan Area Network (MAN) and Wide Area Network (WAN).
- Explain Uniform Resource Locators with suitable examples.
PART – C
Answer any FOUR questions: (4×12.5 =50)
- Discuss in detail the physical description, application and transmission characteristics of (i) twisted pair (ii) coaxial cable and (iii) optical fibre.
- Describe the characteristics of Frequency Division Multiplexing (FDM) and explain the uses of multiplexing in data communication.
- Describe the different layers of open systems interconnection (OSI) reference model.
- What is a routing algorithm? Explain the functions of (a) Multicast and (b) Broadcast routing.
- Discuss the architectural overview of World Wide Web.
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