In the implementation of VLSM techniques on a network using a single Class C IP address，which subnetmask is the most efficient for point-to-point serial links？（）
- A、255.255.255.240
- B、255.255.255.254
- C、255.255.255.252
- D、255.255.255.0
- E、255.255.255.248
正确答案:C
答案解析:有
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