单项选择题 What is the name of the VTP mode of operation that enables a switch to forward only VTPadvertisements while still permitting the editing of local VLAN information?（）

单项选择题 Which command can be arouter to verify the layer 3 path to a host?（）

单项选择题 Which of the following is true regarding the use of switches and hubs for network connectivity（）。