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Which of the following commands can be used to display whether a link is using ISL or IEEE 802.1q encapsulation?
show vlan brief
show switchport trunk
show interface [int] trunk
show interface [int] switchport trunk
ISL and 802.1q are trunk encapsulation methods. Use the command "show interface trunk" to view if an interface is in trunk mode, which trunk encapsulation method is using and the native vlan configured. "show interface switchport trunk" is not a valid command, but the "show interface switchport" command will also show the encapsulation, operational status, trunking information, pruning information, and more. For more information, review http://www.ciscopress.com/articles/article.asp?p=2181837&seqNum=7.
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