單項選擇題At which lay er of the OSI model does the Spanning Tree Protocol (STP) operate at（）

A.Lay er 5
B.Lay er 4
C.Lay er 3
D.Lay er 2
E.Lay er 1


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1.多項選擇題Which two statements about the Cisco Aironet Desktop Utility (ADU) are true（）

A.The Aironet Desktop Utility （ADU ）profile manager feature can create and manage only one profile for the wireless client adapter.
B.The Aironet Desktop Utility (ADU) can support only one wireless client adapter installed and used at a time.
C.The Aironet Desktop Utility (ADU) can be used to establish the association between the client adapter and the access point , manage authentication to the wireless network , and enable encryption.
D.The Aironet Desktop Utility (ADU) and the Microsoft Wireless Configuration Manager can be used at the same time to configure the wireless client adapter.

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