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By default, which of the following factors determines the spanning-tree path cost?

A、It is the individual link cost based on latency

B、It is the sum of the costs based on bandwidth

C、It is the total hop count

D、It is dynamically determined based on load

E、None of the above

时间：2022-01-07 21:48 关键词：

答案解析

B
解析：Explanation:"TheSTPcostisanaccumulatedtotalpathcostbasedontheavailablebandwidthofeachofthelinks."Note:Apathcostvalueisgiventoeachport.Thecostistypicallybasedonaguidelineestablishedaspartof802.1d.Accordingtotheoriginalspecification,costis1,000Mbps(1gigabitpersecond)dividedbythebandwidthofthesegmentconnectedtotheport.Therefore,a10Mbpsconnectionwouldhaveacostof(1,000/10)100.Tocompensateforthespeedofnetworksincreasingbeyondthegigabitrange,thestandardcosthasbeenslightlymodified.Thenewcostvaluesare:Youshouldalsonotethatthepathcostcanbeanarbitraryvalueassignedbythenetworkadministrator,insteadofoneofthestandardcostvalues.IncorrectAnswers:A,D:TheSTPprocessdoesnottakeintoaccountthelatencyorloadofalink.STPdoesnotrecalculatethelinkcostsdynamically.C.HopcountsareusedbyRIProuterstocalculatethecostofaroutetoadestination.TheSTPprocessresidesatlayer2oftheOSImodel,wherehopcountsarenotconsidered.