Which of the following protocols uses both TCP and UDP ports?（）

Which command enhances the 802.1D convergence time on ports that are connected to hosts?（）

A. spanning-tree backbonefast
B. spanning-tree uplinkfast
C. spanning-tree portfast
D. spanning-tree cost512

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Which IEEE standard protocol is initiated as a result of successful DTP completion in a switch over FastEthernet?（）

A. 802.3ad
B. 802.1w
C. 802.1Q
D. 802.1d

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