免费STP学习资料：从基础到实战，助你掌握Spanning Tree Protocol

以下是一些免费的STP学习资料：

1. Cisco官方文档：https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/5234-5.html

2. STP基础知识视频教程：https://www.youtube.com/watch?v=4Lz6MfSbTJw

3. STP故障排除视频教程：https://www.youtube.com/watch?v=JbNgyFtFjE4

4. STP实战案例讲解视频教程：https://www.youtube.com/watch?v=5N5IQvB6P4E

5. STP在线模拟实验：https://www.netacad.com/courses/packet-tracer/spanning-tree-protocol

6. STP白皮书：https://www.cisco.com/c/dam/en/us/td/docs/solutions/CVD/Campus/cisco-campus-lan-wireless-sol-chap5.pdf

7. STP学习笔记：https://networklessons.com/spanning-tree-protocol/stp-spanning-tree-protocol

8. STP练习题：https://www.networkstraining.com/stp-multiple-choice-questions/