用来承载多个VLAN流量的协议组是（ ）。
- A.802.11a和802.1q
- B.ISL和802.1q
- C.ISL和802.3ab
- D.SSL和802.11b
正确答案及解析
正确答案
解析
在以太网为介质的干道上，目前有两种主要的干道标记技术：国际标准IEEE 802.1Q和思科的私有标准ISL。
IEEE 802.1Q会在数据帧准备通过干道的时候对数据帧的帧头进行编辑，在数据帧的头上放置单一的标识，以标识数据帧来自哪个VLAN。当数据帧离开干道时，标识被去除。
ISL封装技术是思科公司开发的私有技术，在帧的前面的后面都添加封装信息，其中包含VLAN ID。该封装协议在标准以太帧头部加上26字节的ISL头，以太帧尾部加上4字节的ISL尾，共30个字节的封装信息。
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