多项选择题
A single 802.11g access point has been configured and installed in the center of a square office. A few wireless users are experiencing slow performance and drops while most users are operating at peak efficiency. What are three likely causes of this problem?（）
A. mismatched TKIP encryption B. null SSID C. cordless phones D. mismatched SSID E. metal file cabinets F. antenna type or direction
多项选择题 What are two security appliances that can be installed in a network?（）
多项选择题 Which of the following describes the roles of devices in a WAN?（）
多项选择题 Switch ports operating in which two roles will forward traffic according to the IEEE 802.1w standard?（）
