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.
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.
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