问题:
A . It supports autonegotiation for both ISL and IEEE 802.1Q trunks.
B . It must be disabled on an interface if you do not want the interface to work as a trunk or start negotiation to become a trunk.
C . It is a point-to-multipoint protocol.
D . It is a point-to-point protocol.
E . It is not supported on private VLAN ports or tunneling ports.
● 参考解析
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