单项选择题
A switch is configured with all ports assigned to vlan 2 with full duplex FastEthernet to segment existing departmental traffic. What is the effect of adding switch ports to a new VLAN on the switch?（）
A.More collision domains will be created. B.IP address utilization will be more efficient. C.More bandwidth will be required than was needed previously. D.An additional broadcast domain will be created.
单项选择题 Which switch would STP choose to become the root bridge in the selection process?（）
多项选择题 Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network? （）
单项选择题 What is the function of the command switchport trunk native vlan 999 on a switch?（）
