Your ISP assigned you a full class B address space. From this, you need at least 300 sub-networks that can support at least 50 hosts each. Which of the subnet masksbelow are capable of satisfying your needs?（）
- A、255.255.255.0
- B、255.255.255.128
- C、255.255.252.0
- D、255.255.255.224
- E、255.255.255.192
- F、255.255.248.0
正确答案:B,E
答案解析:有
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