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單項選擇題

You have been asked to use a 30 bit subnet mask to segment the following network block: 108.12.5.0. How many useable subnetworks and usable hosts could be created?()

A.32 networks with 8 hosts
B.62 networks with 2 hosts
C.30 networks with 16 hosts
D.32 networks with 14 hosts

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