单项选择题
A.BPDU guard can be used to prevent invalid BPDUs from propagating throughout the network.
B.BPDU guard can guarantee proper selection of the root bridge.
C.BPDU guard can be utilized to prevent the switch from transmitteing BPDUs and incorrectly altering the root bridge election.
D.BPDU guard can be utilized along with PortFast to shut down ports when a switch is connected to the port.
E.None of the other alternatives apply
单项选择题 Refer to the exhibit. What is the sequence of events when a VoIP call is placed from IP phone P1 to IP phone P2？ （）
单项选择题 Exhibit： You work as a network administrator at. You study the exhibit carefully. In the wireless LAN all devices are configured with static WEP keys. What will happen if the access point receives packets sent by the wireless client adapter that are not encrypted with the appropriate key？（）
单项选择题 Exhibit： You work as a network technician at. Study the exhibit carefully. You are required configure the static WEP keys on the wireless client adapter using the Cisco ADU （Aironet Desktop Utility）. What should you have in mind when doing this？（）