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填空题 THe URL defines four things:,,, and .

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填空题 Each IP consists of ____bytes.

判断题 SMTP is a protocol for file transfer. ( ) 对 ( ) 错

A. 对
B. 错

判断题 FTP is a protocol for file transfer. ( ) 对 ( ) 错

A. 对
B. 错

判断题 The physical layer is responsible for transmitting a bit stream over a physical medium. ( ) 对 ( ) 错

A. 对
B. 错