Salient Features of TCP
- Piggybacking of acknowledments:The ACK for the last received packet need not be sent as a new packet, but gets a free ride on the subsequently outgoing data frame(using the ACK field in the frame header). The method is temporarily delaying outgoing ACKs so that they might be hooked on the subsequently outgoing data frame is known as piggybacking. But ACK can't be delayed for a long time if receiver(of the packet to be acknowledged) does not have any data to send.
- Flow and congestion control:Transmission control protocol takes care of flow control by ensuring that both ends have sufficient resources and both can handle the speed of data transfer of every other so that none of them gets overloaded with data. The term congestion control is used in approximately the same context except that resources and speed of every router is also taken care of. The major concern is network resources in the latter case.
- Multiplexing / Demultiplexing: a bunch of application can be sending/receiving data at the same time. Data from all of them has to be multiplexed together. In receipt of some data from lower layer and TCP has to make a decision which application is the recipient. This is known as demultiplexing. TCP uses the idea of port number to do this.
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