2. 从业资格
  3. In multipoint networks , there are tree

In multipoint networks , there are tree

考试题库2022-08-02  42
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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