notice-ch12-210 - Chapter 12 Random-access protocols Four...

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Chapter 12: Random-access protocols : Four protocols, ALOHA, CSMA, CSMA/CD, and CSMA/CA , These protocols are mostly used in LANs and WANs . Controlled-access protocols: Three protocols, reservation, polling, and token-passing. Some of these protocols are used in LANs , but others have some historical value. Channelization protocols: Three protocols, FDMA, TDMA, and CDMA these protocols are used in cellular telephony . This picture important: In random-access or contention no station is superior to another station and none is assigned control over another. T In random-access : a station that has data to send uses a procedure defined by the protocol to make a decision on whether or not to send. ALOHA , the earliest random access method.T ALOHA was designed for a radio (wireless) LAN.T ALOHA was designed for a radio (wireless) LAN ,but it cannot be used on any shared medium. F ( we can used on any shared medium). ALOHA , when a station sends data, another station may attempt to do so at the same time collide and become garbled. T To minimize the chance of collision and, therefore, increase the performance , the CSMA method was developed. T ( may by coming as t or f or MCQ or why) The chance of collision can be reduced if a station senses the medium
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