单项选择题
A.spanning-tree misconfiguration
B.speed mismatch configuration
C.cabling problem
D.configuration problem
多项选择题 Refer to the exhibit. According to the output of the command show tag-switching forwarding-table， which four of these statements are true？（）
多项选择题 An802.1Qtrunkisnotcomingupbetweentwoswitches.Theportsonbothswitchesareconfiguredas"switchportmodedesirable."Assumingthatthereisnophysicalissue，choosetwopossiblecauses.（）
问答题 WRR和SRR的区别是什么？
