Rajiv Gandhi Proudyogiki Vishwavidyalaya 2009-5th Sem B.E Computer Science and Engineering .(ester) ,e, DATA COMMUNICATION - Question Paper
B.E. (Fifth Semester) EXAMINATION, June, 2009
DATA COMMUNICATION
Note : Attempt any Five questions.
1. (a) Differentiate between synchronous and asynchronous communication with suitables.
(b) Assuming a synchronous transmission control scheme, explain how character and frame synchronization are achieved :
[1] with character-oriented transmission
[2] with bit-oriented transmission
2. (a) Explain Shannon-fano encoding and Huffman coding theorem with suitable examples.
(b) a message comprising of different characters which are transmitted over a data link. The relative frequency of occurrence of each character is : A = 0.1, B = 0.25, C = 0.05, D =0.32, E = 0.01, F = 0.07, G =0.2 Derive the entropy of the message and derive the suitable set of code words using Shannon-Fano coding.
3. (a) Explain under what condition circuit switching is better than packet switching.
(b) Derive the following terms as they apply to packet switching routing algorithm : [1] Directory [2] Random [3] Flooding
4. (a) Explain the various line disciplines used for data transmission between two stations with their timing calculations. Give suitable applications of each.
(b) Define the following : [1] Data rate [2] Topology [3] Duplexity.
5. (a) Describe a conceptual view of ISDN.
(b) What are the advantages of digital technology over analog technology ?
(c) DefineShannon and Nyquist on channel capacity.
(d) what do you mean by digital access ?
6. (a) Explain the TCP protocol with their frame structure.Describe each field frame in brief.
(b) Define the following
[1] Piggybacking [2] code converters [3] Protocol converters
7. (a) Describe the principle of operation of CDMA/CD in LAN.
(b) Explain the working of token ringchannel allocation in LAN.
8. Write short notes on any two of the following :
(a) Multiplexing
(b) RS-449
(c) Data compression
(d) High speed modems
| Earning: Approval pending. |
