單項(xiàng)選擇題

You have a class C network, and you need to design it for 5 usable subnets with each subnet handling a minimum of 18 hosts each. Which of the following network masks should you use?()

A.225.225.224.0.
B.225.225.240.0.
C.225.225.255.0.
D.255.255.255.224
E.225.225.255.240

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