单选题What is a characteristic of ISL and 802.1q frame tagging in a switched LAN environment?（）AThey are used to find the best path through a network.BThey allow the exchange of filtering tables.CThey specify different implementations of the Spanning-Tree Protocol.DThey allow the exchange of routing tablesEThey provide inter-switch VLAN communication.
单选题
What is a characteristic of ISL and 802.1q frame tagging in a switched LAN environment?（）
A
They are used to find the best path through a network.
B
They allow the exchange of filtering tables.
C
They specify different implementations of the Spanning-Tree Protocol.
D
They allow the exchange of routing tables
E
They provide inter-switch VLAN communication.
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