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？（）

单项选择题 Whichofthefollowingpowersettingsrepresents50percentpowerinalightweightaccesspoint？（）

多项选择题 In a deployment using the lightweight access points， clients set up to authenticate with eap-peap or eap-cisco wireless （leap） cannot authenticatE.  upon inspection of the failed attempts report you see the following error： "unknown network access server nas." What two problems can cause this type of failure？（）