单项选择题
A.no switchport trunk native vlan vlan-id
B.switchport nonegotiate
C.no switchport mode dynamic desirable
D.switchport mode access
单项选择题 WhichconfigurationoptionwillcausethelinkbetweentwoCisco3600SeriesMultiservicePlatformstobecomeafunctionaltrunk？（）
单项选择题 Whatistheeffectofapplyingtheswitchporttrunkencapsulationdot1qcommandtoaportonaCiscoCatalystswitch？（）
单项选择题 WhichstatementcorrectlydescribestheCiscoimplementationofRSTP？（）