negative acknowledgement การใช้

• In these high throughput environments negative acknowledgements are used to drive down overheads.
• Acknowledgements and negative acknowledgements inform a sender of the receiver's state, so that it can adjust its own state accordingly.
• One such gateway tool is SCPS-TP, which, through its Selective Negative Acknowledgement ( SNACK ) capability, deals successfully with the OOOD problem.
• While TCP uses ACKs to acknowledge groups of packets sent ( something that would be uneconomical over multicast ), PGM uses the concept of Negative Acknowledgements ( NAKs ).
• The receiver sends a negative acknowledgement message ( NAK ) with the sequence-number of the invalid TLP, requesting re-transmission of all TLPs forward of that sequence-number.
• An automatic repeat request ( ARQ ) algorithm, used for error correction, in which a negative acknowledgement ( NAK ) causes retransmission of the word in error as well as the previous N 1 words.
• If someone else happens to want to access the same server at the same time, you'll probably get'NAK'packets ( Negative acknowledgement )-the Ethernet standard REQUIRES a multi-millisecond backoff-retry under those circumstances.