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从业资格
In multipoint networks , there are tree
In multipoint networks , there are tree
考试题库
2022-08-02
15
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.increasesB.equalizesC.reducesD.cancels
选项
A.increases
B.equalizes
C.reduces
D.cancels
答案
C
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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