单项选择题
A.It designates VLAN 999 for untagged traffic.
B.It blocks VLAN 999 traffic from passing on the trunk.
C.It creates a VLAN 999 interface.
D.It designates VLAN 999 as the default for all unkown tagged traffic.
单项选择题 Refer to the exhibit.Switch-1 needs to send data to a host with a MAC address of 00b0.d056.efa4.What will Switch-1 do with this data?（）
单项选择题 What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology?（）
单项选择题 Refer to the exhibit. Based on the information given. Which switch will be elected root bridge and why?（）