RFC 4824:The Transmission of IP Datagrams over the...
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ACK


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... U V W X IP-SFS ACK KAL NAK RTR ...
... receiver. ACK: Frame ACK. Acknowledges reception of one frame. ...
... ACK: Frame ACK. Acknowledges reception of one frame. KAL: KeepALive ...


... interface waits for the link partner to transmit ACK or NAK. ...
... NAK. If ACK has been received, the transmitting interface removes ...
... If the link partner does not transmit ACK or NAK within TIMEOUT, the transmission failed, and the interface ...
... checksum. If the checksum is good, the interface transmits ACK. If the Frame Number of the active frame is 0, the interface ...



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