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