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  3. In multipoint networks，there are three persistence methods when a station finds a channel busy．In the 1-persistent method，after

In multipoint networks，there are three persistence methods when a station finds a channel busy．In the 1-persistent method，after

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问题 In multipoint networks，there are three persistence methods when a station finds a  channel busy．In the 1-persistent method，after the station finds the line idle，it sends its frame  immediately．This method has the ________________ chance of collision because two or more stations  may find the line ________________ and send their frames immediately．In the nonpersistent method，a  station that has a frame to send  ________________ the line．If the line is idle．it sends immediately．If the  line is not idle, it waits a  ________________ amount of time and then senses the line again．The  nonpersistent approach ________________ the chance of collision because it is unlikely that two or more  stations will wait the same amount of time and retry to send simultaneously．The p-persistent  approach combines the advantages of the other two strategies．It reduces the chance of collision and improves efficiency．
选项 A、idle
B、busy
C、useful
D、unusable
答案A
解析
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