单项选择题
A.12.4W B.14.5W C.15.4W D.18.4W
A.Upgrade boot failed!!! B.Upgrade ctrl failed!!! C.Upgrade main failed!!!
A.show mac-address-table B.show port-security address C.show arp incomplete D.show security
A.PVST+/开启 B.STP/开启 C.CRSTP/关闭 D.MSTP/关闭
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