![]() ![]() ![]() ![]() TCP uses cumulative acknowledgment with its TCP sliding window. Cumulative Acknowledgment: the receiver acknowledges that it correctly received a packet, message, or segment in a stream which implicitly informs the sender that the previous packets were received correctly.Positive selective acknowledgment is an option in TCP (RFC 2018) that is useful in Satellite Internet access (RFC 2488). Selective Acknowledgment (SACK): the receiver explicitly lists which packets, messages, or segments in a stream are acknowledged (either negatively or positively).Negative Acknowledgment (NACK): the receiver explicitly notifies the sender which packets, messages, or segments were received incorrectly and thus may need to be retransmitted (RFC 4077).Positive Acknowledgement therefore also implicitly informs the sender which packets were not received and provides detail on packets which need to be retransmitted. Positive Acknowledgement: the receiver explicitly notifies the sender which packets, messages, or segments were received correctly. ![]() There are several forms of acknowledgement which can be used alone or together in networking protocols: an explicit receipt from the destination of the data), retransmission of missing or damaged packets (usually initiated by a time-out), and checksums to provide that reliability. Protocols which provide reliable communication over such networks use a combination of acknowledgments (i.e. Such networks are usually "unreliable", meaning they offer no guarantees that they will not delay, damage, or lose packets, or deliver them out of order. Retransmission is one of the basic mechanisms used by protocols operating over a packet switched computer network to provide reliable communication (such as that provided by a reliable byte stream, for example TCP). Retransmission, essentially identical with automatic repeat request (ARQ), is the resending of packets which have been either damaged or lost. JSTOR ( February 2022) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "Retransmission" data networks – news Please help improve this article by adding citations to reliable sources. ![]()
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