單項(xiàng)選擇題

下面哪些子網(wǎng)掩碼常常用做點(diǎn)到點(diǎn)端口的掩碼?()

A.255.255.255.192
B.255.255.255.224
C.255.255.255.240
D.255.255.255.252

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