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單項(xiàng)選擇題

You have been asked to use a 23-bit network mask to segment the network block 209.18.12.0. How many usable host addresses will there be per subnet?（）

A. 510
B. 1022
C. 2046
D. 8190

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單項(xiàng)選擇題

You have been allocated a /22 network. How many usable hosts are available?（）

A. 510
B. 512
C. 1022
D. 1024

單項(xiàng)選擇題

What are the usable hosts on the .128.0/19 network?（）

A. .128.1 through .143.254
B. .128.128 through .134.254
C. .128.0 through .134.254
D. .128.1 through .159.254