多选题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? （）A255.255.255.0B255.255.255.128C255.255.252.0D255.255.255.224E255.255.255.192F255.255.248.0
多选题
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
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