2. 计算机
  3. CSMA，although more efficient than ALOHA or slotted ALOHA，still has one glaringinefficiency．If the medium is busy，the station wil

CSMA，although more efficient than ALOHA or slotted ALOHA，still has one glaringinefficiency．If the medium is busy，the station wil

admin2019-05-15  66
问题 CSMA，although more efficient than ALOHA or slotted ALOHA，still has one glaringinefficiency．If the medium is busy，the station will wait for a random amount of time．Whentwo frames collide，the medium remains (71)for the duration of transmission of bothdamaged frames．The use of random delays reduces the probability of (72)．For (73)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 (74)．The maximum utilization depends on the length of the flame and on the (75)time；the longer theframes or the shorter the propagation time，the higher the utilization．
(72)
选项 A、transmission
B、collisions
C、transportation
D、reception
答案B
解析
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