單項(xiàng)選擇題當(dāng)一個(gè)A類網(wǎng)絡(luò)使用8個(gè)二進(jìn)制位為子網(wǎng)地址時(shí),它的子網(wǎng)掩碼為()

A.255.0.0.0
B.255.255.0.0
C.255.255.255.0
D.255.255.255.255


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