Most of the communication is not a party to only send, while the other is only receiving, but the two-way street. Therefore, in this case to return to the Ack frame is usually sent by the reverse data frames back together incidentally. This is as long as the frame in the data frame by adding a confirmation number on it. This technology, known as piggybacking confirmed.

Packet : 93317483ting-deng-xie-yi.rar filelist
ting-deng-xie-yi.txt

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