What is CongWin?
When CongWin is below Threshold, sender in slow-start phase, window grows exponentially. • When CongWin is above Threshold, sender is in congestion-avoidance phase, window grows linearly. • When a triple duplicate ACK occurs, Threshold set to CongWin/2 and CongWin set to Threshold.
What is congestion avoidance phase?
Congestion Avoidance Phase : additive increment – This phase starts after the threshold value also denoted as ssthresh. The size of cwnd(congestion window) increases additive. After each RTT cwnd = cwnd + 1. The only way a sender can guess that congestion has occurred is the need to retransmit a segment.
What is congestion control in simple words?
Definition: Congestion control is a method used for monitoring the process of regulating the total amount of data entering the network so as to keep traffic levels at an acceptable value. Congestion control mostly applies to the packet-switching networks.
How to get rid of congestion in TCP?
TCP Congestion Control. 1 Slow Start Phase: starts slowly increment is exponential to threshold. 2 Congestion Avoidance Phase: After reaching the threshold increment is by 1. 3 Congestion Detection Phase: Sender goes back to Slow start phase or Congestion avoidance phase.
What are the three phases of congestion control?
TCP Congestion Control 1 Slow Start Phase: starts slowly increment is exponential to threshold 2 Congestion Avoidance Phase: After reaching the threshold increment is by 1 3 Congestion Detection Phase: Sender goes back to Slow start phase or Congestion avoidance phase. More
Which is more aggressive slow start or congestion avoidance?
Although the strategy is referred to as slow start, its congestion window growth is quite aggressive, more aggressive than the congestion avoidance phase. Before slow start was introduced in TCP, the initial pre-congestion avoidance phase was even faster. Slow start begins initially with a congestion window size (CWND) of 1, 2, 4 or 10 MSS.
Which is an example of a congestion threshold?
(a) ssthresh value reduces to half of the current window size. Example – Assume a TCP protocol experiencing the behavior of slow start. At 5th transmission round with a threshold (ssthresh) value of 32 goes into congestion avoidance phase and continues till 10th transmission.