单选题
Refer to the exhibit and the partial configuration of switch SW_A and SW_B. STP is configured on all switches in the network. SW_B receives this error message on the console port： 
00：06：34： %CDP-4-DUPLEX_MISMATCH： duplex mismatch discovered on FastEthernet0/5 （not half duplex）， with SW_A FastEthernet0/4 （half duplex） ， with TBA05071417（Cat6K-B） 0/4 （half duplex）. What would be the possible outcome of the problem？（）
发布日期：2021-01-28
The root port on switch SW_A will automatically transition to full-duplex mode.
The root port on switch SW_B will fallback to full-duplex mode.
The interfaces between switches SW_A and SW_B will transition to a blocking state.
Interface Fa 0/6 on switch SW_B will transition to a forwarding state and create a bridging loop.
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