Which two statements are true of a network mask?（）
- A、A subnet mask specifies the portion of an IP address that is in a binary format.
- B、A subnet mask specifies the portion of an IP address that is in a decimal format.
- C、A subnet mask specifies the portion of an IP address that represents a network prefix.
- D、A subnet mask specifies the portion of an IP address that represents network hosts.
正确答案:C,D
答案解析:有
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