单项选择题 You have been called upon to add location-based services into an existing controller-based wireless design which primarily encompasses handheld devices such as barcode scanners and Cisco7920 wireless IP phones. In which mode should you deploy the additional access points to achievethe density required without excessive co-channel interference？（）

单项选择题 A Cisco Aironet 1020 controller-based access point has been connected to a Catalyst 3550-24 PWRSwitch. However， when it is powered up， the access point fails. What has caused this problem？（）

单项选择题 Whichwirelessservicecomponentisassociatedwithmaintaininghistoricalandcurrentinformation abouttheWLANsolution？（）