Quote: ACK packets and Quality of Service (qos)

"When you download, your computer needs to send (upload) ACK packets. These are basically saying "yep, I got that part of the download OK". If the computer you are downloading from detects that an ACK has not been received, it assumes that the data was not received and sends it again. The rate at which ACKs are sent back is also used to help determine the maximum speed that you can download data at, so it's important that ACKs get sent as soon as possible and don't get dropped in order to keep your downloads flowing fast. Also, repeatedly dropped ACKs can result in dropped connections, web page time-outs etc."


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