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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