如果指定的地址掩码是255.255.254.0，则有效的主机地址是（ ）。
- A.126.17.3.0
- B.174.15.3.255
- C.20.15.36.0
- D.115.12.4.0
正确答案及解析
正确答案
解析
地址掩码是255.255.254.0，所以主机地址占最后的9位。
126.17.3.0地址的而仅是为：01111110.00010001.00000011.00000000这是一个有效的主机地址。
174.15.3.255的二进制：10101110.00001111.00000011.11111111这是一个广播地址。
20.15.36.0的二进制：00010100.00001111.00100100.00000000这是一个子网地址。
115.12.4.0的二进制：01110011.00001100.00000100.00000000这也是一个子网地址。
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