单项选择题 Refer to the exhibit. Look at the command output. What would be the most probable reason for this port-ID mismatch？（）

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.（）