In multipoint networks , there are tree persistence methods when a station finds a channel busy.in t
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. （2018年下半年网络管理员考试上午真题参考答案）
A．the lowest
B.the highest
C.possible
D.no
A．idle
B.busy
C.useful
D.unusable
参考答案：C A
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