多项选择题
Which two benefits are provided by creating VLANs? （）
A.added security B.dedicated bandwidth C.provides segmentation D.allows switches to route traffic between subinterfaces E.contains collisions
单项选择题 Refer to the exhibit. Which statement is true?（）
单项选择题 What dose a Layer 2 switch use to decide where to forward a received frame?（）
单项选择题 At which layer of the OSI model is RSTP used to prevent loops?（）
