Andhra University www.andhrauniversity.info : Model Question Paper MSc Computer Science

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Andhra University
MSCS 1.5 Data communications
Model Paper
First Question is Compulsory
Answer any four from the remaining and All Questions carry equal marks
Answer all parts of any Question at one place.
Time: 3 Hrs. Max. Marks: 70

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Model Question Paper : http://www.andhrauniversity.info/syl...CS_mqp0708.pdf

1a Write the Role of equalizer
b Discuss the types of TDM and draw schematic diagram for the different types of TDM
c Sketch TCP/IP suite and mention the protocols
d Explain cyclic redundancy check
e Explain poll select mechanism
f. What is bit stuffing?
g. Distinguish between Bit Rate and baud Rate

2a Describe in brief protocol layer summary in ISO reference model
b Discuss Evolution of standards in data communications.

3a Describe ASK, FSK and PSK
b A 1000 – bit block of data is to be transmitted between two DTES.
Describe the ratio of propagation delay to the transmission delay for
i) 100 m of twisted pair wire and a transmission rate of 10Kbps
ii)10 Km of coaxial cable and a transmission rate of 1Mbps

4a What do you understand by data compression and describe at least two kinds of data compressions commonly used?
b A series of 8 – bit message blocks (frames) is to be transmitted across a data link using CRC for error detection. A generator polynomial of 1001 is to be used. I11ustrate using CRC for the message 11101110

5a Explain the role of connection management with respect to a protocol
b A series of 1000- bit frames is to be transmitted using a continuous RQ protocol. Determine the link efficiency for the following type of data link if the velocity of propagation is 2 x 108 ms-1 and bit error rates of the links are all negligibly low. A 50,000 Km satellite link of 2 mbps and a send window k=127.

6a With the aid of frame sequence diagram and assuming go-back-N error control Scheme describe how the following are overcome
i) A corrupted ACK- frame
ii) A corrupted NAK – frame
b) Describe Idle RQ specification

7a Discuss HDLC frame formats
b Describe character – oriented protocols

8 Write Short Notes on the following
a Parity Check b ATM Switching
c Bit synchronization and character synchronization.

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