单项选择题 Inorderforacontroller-basedaccesspointtobeallowedtoparticipateinaggressiveloadbalancing，itmusthaveheardtheclientwithinhowmanyseconds？（）

单项选择题 OnaWLANcontroller，whatisthedefaultlimitonthenumberofentriesinthedatabasethatwillbeusedforlocalauthentication？（）

单项选择题 In a deployment using standalone access points， clients set up to authenticate with EAP-PEAP or EAP-Cisco Wireless （Cisco-LEAP） cannot authenticate. When you inspect the Failed Attempts report on theCisco Secure ACS， you find this error： "Unknown network access server NAS."  Which problem may havecaused this failure？（）