[单选]
A Cisco Aironet 1020 controller-based access point has been connected to a Catalyst 3550-24PWR
Switch. However， when it is powered up， the access point fails.
What has caused this problem？（）

A . access point does not support 802.11h
B . incorrect switch power supply
C . switch port is not enabled
D . switch does not support 802.3af
E . access point has not been initialized with the primary controller

估价师在执业中有可能直接或间接地获得有关前委托人的信息，然后利用这些秘密信息来损害前委托人的利益，这种矛盾的冲突指的是（）。直接利益冲突。连续性利益冲突。间接（潜在）利益冲突。复合关系的利益冲突。数控机床的快速进给有（）种速率可供选择。一。二。三。四。计算机网络最突出的优点是（）运算速度快。运算精度高。存储容量大。资源共享。根据土石坝施工方法的不同，可将土石坝划分为以下五种：（）、（）、（）、（）和（）。起重机司机要做到哪“十不吊”？

A Cisco Aironet 1020 controller-based access point has been connected to a Catalyst 3550-24PWR
Switch. However， when it is powered up， the access point fails.
What has caused this problem？（）

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[单选] A Cisco Aironet 1020 controller-based access point has been connected to a Catalyst 3550-24PWR Switch. However， when it is powered up， the access point fails. What has caused this problem？（）

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[单选]
A Cisco Aironet 1020 controller-based access point has been connected to a Catalyst 3550-24PWR
Switch. However， when it is powered up， the access point fails.
What has caused this problem？（）