多选题802.1Q协议的特点是什么？（）A它是一个2层的消息协议，它保证通过网络的VLAN配置B它包括一个8比特字段指定的帧的优先级C它是专门用于标记的VLAN帧和下交换网络拓扑结构的变化剂量不能满足网络的重新收敛D它修改802.3帧报头，并且因此需要在FCS重新计算E它是一种能够携带未标记的帧的中继协议
多选题
802.1Q协议的特点是什么？（）
A
它是一个2层的消息协议，它保证通过网络的VLAN配置
B
它包括一个8比特字段指定的帧的优先级
C
它是专门用于标记的VLAN帧和下交换网络拓扑结构的变化剂量不能满足网络的重新收敛
D
它修改802.3帧报头，并且因此需要在FCS重新计算
E
它是一种能够携带未标记的帧的中继协议
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