单项选择题
A.root port，designated port，alternate port，backup port，and disabled
B.standby port，alternate port，root port，and disabled
C.standby port，designated port，backup port，and disabled
D.root port，designated port，alternate port，and standby port
单项选择题 Forthefollowingports，whichportisoneverybridgeinaSpanningTreeProtocolIEEE802.1wnetworkexcepttherootbridge？（）
单项选择题 Whatarethe"boundIPaddresses"usedforinLDP？（）
单项选择题 WhentwobridgesarecompetingfortherootbridgeofanIEEE802.1Dspanningtreeandbothhavethesamebridgepriorityconfigured，whichparameterdeterminesthewinner？（）