单选题A Cisco Aironet 1020 controller-based access point has been connected to a Catalyst 3550-24 PWRSwitch. However， when it is powered up， the access point fails. What has caused this problem？（）Aaccess point has not been initialized with the primary controllerBswitch port is not enabledCswitch does not support 802.3afDaccess point does not support 802.11hEincorrect switch power supply
单选题
A Cisco Aironet 1020 controller-based access point has been connected to a Catalyst 3550-24 PWRSwitch. However， when it is powered up， the access point fails. What has caused this problem？（）
A
access point has not been initialized with the primary controller
B
switch port is not enabled
C
switch does not support 802.3af
D
access point does not support 802.11h
E
incorrect switch power supply
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