单项选择题
A. Spanning tree PortFast cannot be configured on a port where a voice VLAN is configured.
B. Sticky secure MAC addresses cannot be used on a port when a voice VLAN is configured.
C. Spanning tree PortFast cannot be configured on a port when a sticky secure MAC address is used.
D. The switch port must be configured as a trunk.
多项选择题 You need to configure port security on switch R1. Which two statements are true about this technology？ （）
多项选择题 Refer to the exhibit. Based on the running configuration that is shown for interface FastEthernet0/2， what two conclusions can be deduced？（）
单项选择题 Refer to the exhibit. Which interface or interfaces on switch SW_A can have the port security feature enabled？（）
