Refer to the exhibit. Which two statements about the topologies shown are correct?（） 
- A、Design 1 is a looped triangle design.
- B、Design 2 is a looped triangle design.
- C、Design 2 achieves quick convergence using RSTP.
- D、Both designs supportstateful services at the aggregation layer.
- E、Design 2 is the most widely deployed in enterprise data centers.
正确答案:A,D
答案解析:有
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