which address range efficiently summarizes the routing table of the addresses for router main?（） 
- A、172.16.0.0/18
- B、172.16.0.0/16
- C、172.16.0.0/20
- D、172.16.0.0/21
正确答案:C
答案解析:有
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which address range efficiently summarizes the routing table of the addresses for router main?（）
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