[多选] 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.

什么是信息经济？ What are three advantages of the Cisco Integrated Services Pouter product family？（Choose three.）（） provides advanced security such as hardware encryption acceleration。 provides investment protection through increased modularity。 comes equipped with at least one 1000-based TX interlace。 contains integrated wireless access using the 802.11 g/b standard。 contains integrated web-based management tools for easy configuration and maintenance。层系组班级授课制 ZXAN#interfacegei_0/4/1是进入（）端口命令。上联板。主控板。 ONU。 PON板。 Which two of these are characteristics of the 802.1Q protocol?（）

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

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