cnp3-ebook

protocols/congestion

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In an internetwork, i.e. a networking composed of different types of networks (such as the Internet), congestion control could be implemented either in the network layer or the transport layer. The congestion problem was clearly identified in the later 1980s and the researchers who developed techniques to solve the problem opted for a solution in the transport layer. Adding congestion control to the transport layer makes sense since this layer provides a reliable data transfer and avoiding congestion is a factor in this reliable delivery. The transport layer already deals with heterogeneous networks thanks to its `self-clocking` property that we have already described. In this section, we explain how congestion control has been added to TCP and how this mechanism could be improved in the future.

4 years ago

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