67 write short notes on a data transmission modes b

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Unformatted text preview: lain its function with the help of a diagram. 30. Describe the two basic methods of multiplexing. Give uses of both the methods. 31. List out the differences between FDM and TDM. Which method is suitable for communication between computers and why? 32. What is a concentrator? Justify its use in a data communication system. 33. What is FEP? Illustrate its use. 34. Describe the asynchronous and synchronous modes of data transmission. 35. List out the relative advantages and disadvantages of asynchronous and synchronous modes of data transmission. 36. Explain how circuit switching is used to link the sender and the receiver in a communication network. What are the advantages and disadvantages of this method of switching? 37. Explain the store-and-forward method of message switching. Give the advantages and disadvantages of this message switching technique. 38. What is packet switching? Why is this method used for digital data communication between computers? 39. What is routing? What are the desirable features of a good routing algorithm? 40. Differentiate between source routing and hop-by-hop routing methods. Give their relative advantages and disadvantages. 41. Differentiate between static and dynamic routing methods. Give their relative advantages and disadvantages. 42. What is meant by network topology? Describe three commonly used network topologies with their relative advantages and disadvantages. 43. What is a hybrid network? Why are they used? 44. Write a short note on multi-access bus network. 45. What is a LAN? What are its main objectives? 46. What is WAN? What is a MAN? 47. Differentiate between a LAN and a WAN. Give one example of each. 48. What is a communication protocol? What are the normal functions performed by these protocols? 49. Why are communication protocols needed in a computer network? 50. What is a network interface card? Explain its usage in a computer system. 51. Why is layering used in the design of communication networks? 52. Describe the layeri...
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