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 the cisco secure acs， you find this error： "unknown network access server nas."  Which problem may have caused this failure？（）

单项选择题 Whichofthefollowingcommandsonthewirelessinterfaceofacisco3845integratedservicesrouterallowsthessidtobroadcast？（）

单项选择题 Yours truly，customer has deployed a cisco wireless location appliance within its warehouse  environment. however， employees there have been experiencing problems when tracking objects using active rfid tags. the rfid tag data is not being collected. On which device would you verify  that rfids have been enabled？（）