At which lay er of the OSI model does the Spanning Tree Protocol (STP) operate at()
- A、Lay er 5
- B、Lay er 4
- C、Lay er 3
- D、Lay er 2
- E、Lay er 1
正确答案:D
答案解析:有

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At which lay er of the OSI model does the Spanning Tree Protocol (STP) operate at()
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