Based on the network shown in the graphic which option contains the potential networking problem and protocol or setting that can to prevent the problem?（） 
- A、Routing loops, hold down timers
- B、Switching loops, split horizon
- C、Routing loops, split horizon
- D、Switching loops, VTP
- E、Routing loops, STP
- F、Switching loops, STP
正确答案:F
答案解析:有
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