Rajiv Gandhi Technical UniversityBHOPAL
Fifth Semester,June-2009
Data Communication & Networking EC-501
Note: Attempt any five questions.All question carry equal marks.Q.1.(a) Differentiate between synchronous and asynchronous communication with suitable.
(b) Assuming a synchronous transmission control scheme, explain how character and frame synchronization are achieved:
- With character-oriented transmission
- With bit-oriented transmission
(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.
Q.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:
- Directory
- Random
- Flooding
(b) Define the following:
- Data rate
- Topology
- Duplexity.
(b) What are the advantages of digital technology over analog technology?
(c) Define Shannon and Nyquist on channel capacity.
(d) What do you mean by digital access?
Q.6.(a) Explain the TCP protocol with their frame structure. Describe each field frame in brief.
(b) Define the following
- Piggybacking
- code converters
- Protocol converters
(b) Explain the working of token ring channel allocation in LAN.
Q.8.Write short notes on any two of the following :
- Multiplexing
- RS-449
- Data compression
- High speed modems
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