Which two are natively included by the IEEE 802.1w standard？（）
- A、instances can control a selection of VLANs
- B、load balancing
- C、fast transition to forwarding state
- D、backbone，uplink，and portfast （or equivalent）
- E、root，loop，and BPDU guard （or equivalent）
正确答案:C,D
答案解析:有
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