A national retail chain needs to

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A national retail chain needs to design an IP addressing scheme to support a nationwide network. The company needs a minimum of 300 sub-networks and a maximum of 50 host addresses per subnet. Working with only one Class B address, which of the following subnet masks will support an appropriate addressing scheme?（）

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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