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The NAK (or NACK; standing for "Negative-Acknowledgement") protocol message is sent in many communications protocols to negatively acknowledge or reject a previously received message, or to indicate some kind of error. Many protocols are acknowledgement (ACK)-based, meaning that they positively acknowledge receipt of messages. Transmission Control Protocol (TCP) is an example of an ACK-based protocol. Other protocols are NAK-based, meaning that they only respond to messages if there is a problem. Examples include most reliable multicast protocols which send a NAK when the receiver detects missing packets. Still other protocols make use of both NAKs and ACKs. Bisync and Adaptive Link Rate (for Energy-Efficient Ethernet) is an example. A special case of the NAK protocol message is the negative-acknowledge character. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「NAK (protocol message)」の詳細全文を読む スポンサード リンク
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