问题

Which two of these are characteristics

Which two of these are characteristics of the 802.1Q protocol?（）

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.

参考答案

参考解析：

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