多项选择题
Which three objectives would be met by designing Layer 3 switching in the Campus Backbone of a medium size installation?（）
A. scale to a large size B. increase router peering C. provide a flexible topology with no spanning tree loops D. control broadcasts in the backbone
多项选择题 WhichthreeLayer2accessdesignshavealloftheiruplinksinanactivestate？（）
单项选择题 WhenBGPtuningisused，howispacketflowintothee-commercemodulecontrolled？（）
单项选择题 Whatismeantbytheterm"firewallsandwich"？（）
