单项选择题
How many broadcast domains are shown in the graphic assuming only the default vlan is configured on the switches?（）
A.one B.six C.twelve D.two
多项选择题 Which are valid modes for a switch port used as a VLAN trunk? （）
单项选择题 What is one benefit of PVST+?（）
单项选择题 Refer to the exhibit. What switch proves the spanning-tree designated port role for the network segment that services the printers?（）
