In multipoint networks , there are tree

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问题 In multipoint networks , there are tree 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.A.overhearsB.hearsC.listensD.senses

选项 A.overhears
B.hears
C.listens
D.senses

答案 D

解析在多点接入网络中，当一个站点发现信道繁忙时，采用三种坚持方法。在1坚持方法中，当站点发现线路空闲后，立即发送帧。由于两个或多个站点可能同时发现线路空闲，并立即发送帧，因此该方法具有最高的冲突概率。在非坚持方法中，需要发送帧的站点监听线路，如果线路空闲，则立即发送。如果线路不是空闲的，它会随机等待一段时间，然后再次监听线路。非坚持的方法降低了冲突的可能性，因为两个或多个站点不太可能等待相同的时间后同时发送帧。P坚持的方法综合了前面两种方法的优点，它不但降低了冲突的可能性，还提高了效率。

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本试题收录于：初级网络管理员题库软件水平考试初中高级分类

初级网络管理员

软件水平考试初中高级

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