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计算机考试试题及答案解析

未知题型

WhichtwostatementscorrectlydescribeUDLD？（）
A.UnidirectionallinkdetectionisachievedthroughmonitoringSTPBPDUs.
B.Itisrecommendedthatitbeenabledgloballyratherthanonanindividualport.
C.Whenanerrorisdetected，normalmodewilldisableaport.
D.Itisrecommendedthatitbeenabledinnormalmode.
E.Itisrecommendedthatitbeusedwiththeloopguardfeature.
【参考答案】

B, E

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