一台CISCO交换机和一台H3C交换机相连，互联端口都工作在VLANTRUNK模式下，这两个端口应该使用的VLAN协议分别是（ ）。
- A.ISL和IEEE802.10
- B.ISL和ISL
- C.ISL和IEEE802.1Q
- D.IEEE802.1Q和IEEE802.1Q
正确答案及解析
正确答案
解析
本题考查VLAN封装的知识。
VLAN的封装有IEEE802.1Q和ISL两种标准。IEEE802.1Q属于公有标准，而ISL是CISCO的私有标准。当CISCO交换机和H3C交换机连接，两端都应采用公有标准封装。
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