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多选题
Which two of the following are designated fields for MAC tunneling protocol（802.1 ah）？（）
A
Service Ethertype
B
ISL
C
PseudoLAN TAG
D
802.1q VLAN TAG
E
Control Word
F
Tunnel Label
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多选题Which two of these are characteristics of the 802.1Q protocol？（）Ait is a layer 2 messaging protocol which maintains vlan configurations across network.Bit includes an 8-bit field which specifies the priority of a frame.Cit is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes.Dit modifies the 802.3 frame header，and thus requires that the FCS be recomputed.Eit is a trunking protocol capable of carring untagged frames.
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