问题:
A . it is a layer 2 messaging protocol which maintains vlan configurations across network.
B . it includes an 8-bit field which specifies the priority of a frame.
C . it is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes.
D . it modifies the 802.3 frame header,and thus requires that the FCS be recomputed.
E . it is a trunking protocol capable of carring untagged frames.
● 参考解析
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