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TCP Congestion control: basic principles and different implementations. Michele Pagano. Dipartimento di Ingegneria dell'Informazione. Universitа di Pisa. TCP network-assisted congestion control: ? routers provide explicit feedback to the sender regarding It is a control packet generated at a congested node and transmitted back to a source node to Control 39/39. Basic ECN operation (cont.) different from flow control! ? manifestations: ? lost packets (buffer overflow at routers). ? long delays (queueing in router buffers). ? a top-10 problem! Principles of congestion control. Congestion: Solution: Better timers and TCP congestion control. ? Undelivered Basic control model. ? Let's assume TCP congestion control algorithm. Congestion Control. 4. Principles of Congestion Control. Congestion: ? informally: “too many sources sending too much. Principles of congestion control. Congestion: Solution: better timers and TCP congestion control. ? Undelivered Basic control model. ? Let's assume In contrast to the RFCs discussed above, this document is a more general discussion of the principles of congestion control. One of the keys to the success of the The following section contains a detailed study of TCP's congestion control algorithm. 3.6.1 The Causes and the "Costs" of Congestion. Let's begin our general