单项选择题
A.Broadcasts only use network layer addressing.
B.A broadcast frame is never forwarded by a switch.
C.A broadcast address will never be the source address of a frame.
D.Broadcast addresses use an incorrect format for the switching table.
E.Broadcast frames are never sent to switches.
单项选择题 Which commands is necessary to permit SSH or Telnet access to a cisco switch that is otherwise configured for these vty line protocols？（）
多项选择题 As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the devicE.For what two reasons can this happen? （）
单项选择题 Which additional configuration step is necessary in order to connect to an access point that has SSID broadcasting disabled（）。