单项选择题 Last December you erected a bridge link between two buildings on your campus. It is now Apriland the foliage in the trees is full， and the bridge link will no longer maintain connectivity. Which action will most likely solve the problem？（）

单项选择题 An 802.1X client cannot authenticate to an autonomous access point configured for multiple VLANs. The native VLAN does not have an SSID configured. Which one of the following links being down would prevent the clients from authenticating？（）

多项选择题 In a deployment using the lightweight access points， clients set up to authenticate with EAP-PEAPor EAP-Cisco Wireless （LEAP） cannot authenticate. Upon inspection of the Failed Attempts reportyou see the following error： "Unknown network access server NAS."  What two problems can causethis type of failure？（）