单项选择题
A. probe request/response， authentication request/response， association request/response
B. association request/response， authentication request/response， probe request/response
C. probe request/response， association request/response， authentication request/response
D. association request/response， probe request/response， authentication request/response
多项选择题 WhichtwostatementsaretrueaboutvoicepacketsinaLAN？（Choosetwo.）（）
单项选择题 Refer to the exhibit. A Cisco Aironet Wireless LAN Client Adapter has been installed and configured through the ADU on the PC. The Aironet System Tray Utility （ASTU） has been enabled during the installation and the icon appears in the system tray area in the lower right of the desktop. What is the significance of the icon？（）
多项选择题 WhichtwostatementsabouttheCiscoAironetDesktopUtility（ADU）aretrue？（Choosetwo.）（）