單項選擇題

You need to connect two Company core switches via an ISL trunk. 
Which statement is true  regarding the configuration of ISL trunks？ （）

A. A Catalyst switch cannot have ISL and IEEE 802.1q trunks enabled.
B. All Catalyst switches support ISL trunking.
C. A Catalyst switch will report giants if one side is configured for ISL while the other side is not.
D. ISL trunking requires that native VLANs match.
E. None of the other alternatives apply

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