首页
登录
从业资格
CSMA,although more efficient than ALOHA
CSMA,although more efficient than ALOHA
资格题库
2022-08-02
49
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(请作答此空).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率的情况。当信道繁忙的时候,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非常可观的。如果站点在传输时还继续监听信道,就能减少这种浪费。最大利用率与帧长和传播时间有关,帧越长或者传播时间越短,利用率就越高。
转载请注明原文地址:https://tihaiku.com/congyezige/2402487.html
本试题收录于:
中级 网络工程师题库软件水平考试初中高级分类
中级 网络工程师
软件水平考试初中高级
相关试题推荐
Althoughagivenwaveformmaycontainfr
CSMA,althoughmoreefficientthanALOHA
CSMA,althoughmoreefficientthanALOHA
CSMA,althoughmoreefficientthanALOHA
CSMA,althoughmoreefficientthanALOHA
CSMA,althoughmoreefficientthanALOHA
CSMA,althoughmoreefficientthanALOHA
CSMA,althoughmoreefficientthanALOHA
CSMA,althoughmoreefficientthanALOHA
CSMA,althoughmoreefficientthanALOHA
随机试题
OneafternoonIwassittingatmyfavoritetableinarestaurant,waitingfo
GeneralIdeasaboutRhetoricI.Thedefinition&unders
TheBBChasjustsuccessfullydemonstratedanewdigitalradio______system.A、tra
Itisusefultobeabletopredicttheextent______apricechangewillaffectsu
某些植物需要经历一定的低温过程才能开花的现象称为______。
下列定额中,属于计量性定额的是()。A.施工定额 B.预算定额 C.概算定
蝶窦开口于()A.下鼻道 B.中鼻道 C.上鼻道 D.蝶筛隐窝
采用一次性原始凭证不仅可以减少凭证数量,简化核算手续,而且可以事前控制有关耗费,
卵巢主要合成的、而且生物活性最强的雌激素是A.雌二醇B.雌三醇C.孕激素D.睾酮
男,20岁,体重60公斤,每天需能量3000千卡,在完全不摄入蛋白质食物时,每天
最新回复
(
0
)