多项选择题
A. PortFast
B. UplinkFast
C. loop guard
D. root guard
E. BPDU guard
F. BackboneFast
单项选择题 herequirementforhighavailabilitywithintheDataCenternetworkmaycausethedesignertoconsiderwhichoneofthefollowingsolutions？（）
单项选择题 Towhichswitchorswitchesshouldyouprovideredundantlinksinordertoachievehigh availabilitywithreliablefastconvergenceintheenterprisecampus？（）
单项选择题 Refer to the exhibit. Which recommended practice is applicable？（）