单项选择题
A.enables LACP unconditionally
B.enables PAgP only if a PAgP device is detected
C.enables PAgP unconditionally
D.enables Etherchannel only
E.enables LACP only if a LACP device is detected
多项选择题 Refer to the exhibit. Initially， LinkA is connected and forwarding traffic. A new LinkB is then attached between SwitchA and HubA. Which two statements are true about the possible result of attaching the second link？（）
单项选择题 HowareSTPtimersandstatetransitionsaffectedwhenatopologychangeoccursinanSTPenvironment？（）
多项选择题 WhattwothingswilloccurwhenanedgeportreceivesaBPDU？（）
