Which of these correctly identifies a difference between the way BPDUs are handled by 802.1w and 802.1D？（）
- A、802.1D bridges do not relay BPDUs.
- B、802.1w bridges do not relay BPDUs.
- C、802.1D bridges only relay BPDUs received from the root.
- D、802.1w bridges only relay BPDUs received from the root.
正确答案:C
答案解析:有
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