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CSMA,although more efficient than ALOHA
CSMA,although more efficient than ALOHA
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2022-08-02
77
问题
CSMA,although more efficient than ALOHA or slotted ALOHA,still has one glaring inefficiency.If the medium is busy,the station will wait for a random amount of time. When two frames collide,the medium remains ( ) for the duration of transmission of both damaged frames. The use of random delays reduces the probability of( ). For( )frames,compared to propagation time,the amount of wasted capacity can be considerable.This waste can be reduced if a station continues to listen to the medium while( ).The maximum utilization depends on the length of the frame and on the( ) time; the longer the frames or the shorter the propagation time,the higher the utilization..A.transmissionB.collisionsC.transportationD.reception
选项
A.transmission
B.collisions
C.transportation
D.reception
答案
B
解析
尽管CSMA的效率远远大于ALOHA或时隙ALOHA,但它依然存在一个显著低效的情况。当信道忙的时候,站点需要等待一段随机时间。当两个帧发生冲突时,在两个被破坏帧的传输持续时间内,信道仍然无法使用。使用随机时延会降低冲突的可能性,但是如果帧的长度相对于传播时间来说很长,那么容量的浪费也是很可观的。如果站点继续边发送边监听,这种浪费可以减少。最大利用率取决于帧的长度和传播时间; 帧越长或传播时间越短,利用率越高。
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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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