单项选择题
A.1677216B.1677214C.16384D.16382
A.FF:FF:FF:FF:FF:FF B.255.255.255.255 C.255.255.255.0 D.1023
A.MAC B.IP C.端口 D.烧录
A.反转 B.直通 C.交叉 D.铜缆
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