多选题 : 端口启动Portfast的两个必要条件是()。
(A)connected to a single host
(B)the interface is in a non-trunking mode
(C)connected to a switch
(D)the interface is in a trunking mode
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(A)connected to a single host
(B)the interface is in a non-trunking mode
(C)connected to a switch
(D)the interface is in a trunking mode