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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.C.A. DEGREE EXAMINATION – COMPUTER APPLICATIONS
FIFTH SEMESTER – APRIL 2013
CA 5506/CA
/CA 5502 - INTRODUCTION TO DATA COMMUNICATION
Date: 11/05/2013
Time: 9:00 - 12:00
Dept. No.
Max. : 100 Marks
PART-A
Answer ALL of the following:
(10 X 2 = 20 Marks)
1. What are the key elements of a communication model?
2. What is the difference between a packet and a frame?
3. List the key services provided by the session layer.
4. What are the major classifications of transmission media?
5. What is differential coding?
6. List the three basic encoding or modulation techniques for transforming digital data into analog
signal.
7. What is modem?
8. List the guided media commonly used for data communication.
9. What is multiplexing?
10. What are the most common techniques for error control?
PART-B
Answer ALL of the following:
(5 X 8 = 40 Marks)
11. a) Explain the important characteristics of a protocol in detail.
(OR)
b) Explain the two important characteristics that distinguish various data link configurations.
12. a) With example explain analog data and digital data.
(OR)
b) Explain the following:
i) Discrete Vs analog signal
ii) Periodic Vs aperiodic
dic signal
13. a) Explain the various digital signal encoding format with neat sketch.
(OR)
b) Explain ASK, FSK and PSK with neat sketch.
14. a) Explain the physical description and transmission characteristics of coaxial cable.
(OR)
b) Explain the physical description and transmission characteristics of optical fiber
15. a) Explain stop-and-wait ARQ in detail.
(OR)
b) Explain various error detection mechanisms in detail.
PART-C
Answer any TWO of the following:
(2 X 20 = 40 Marks)
16 a) Explain the various topologies in detail.
b) Explain the 7 layer OSI model with neat sketch.
17 a) Explain EIA-232-F interface in detail.
b) Explain about unguided media in detail.
18 a) A CRC is constructed to generate a 4 bits frame check sequence for an 8-bit message
[M (1010101101), P (11010)]. Find the CRC.
b) Explain the various types of multiplexing in detail.
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