What is the best TCP congestion algorithm?
TCP Reno is the most widely deployed algorithm. TCP Vegas introduces the measurement of RTT for evaluating the link quality. It uses additive increases and additive decreases for the congestion window. This variant is optimised for wireless networks, since it was designed to handle random packet loss better.
How does TCP control congestion?
TCP uses a congestion window in the sender side to do congestion avoidance. The congestion window indicates the maximum amount of data that can be sent out on a connection without being acknowledged. TCP detects congestion when it fails to receive an acknowledgement for a packet within the estimated timeout.
What is TCP CWND?
Congestion Window (cwnd) is a TCP state variable that limits the amount of data the TCP can send into the network before receiving an ACK. Together, the two variables are used to regulate data flow in TCP connections, minimize congestion, and improve network performance.
What causes TCP congestion?
While rwnd is present in the TCP header, cwnd is known only to a sender and is not sent over the links. Cwnd is maintained for each TCP session and represents the maximum amount of data that can be sent into the network without being acknowledged.
Which algorithm is used for congestion control?
Congestion Control is a mechanism that controls the entry of data packets into the network, enabling a better use of a shared network infrastructure and avoiding congestive collapse. Congestive-Avoidance Algorithms (CAA) are implemented at the TCP layer as the mechanism to avoid congestive collapse in a network.
What is TCP Slowstart?
Definition. TCP slow start is an algorithm which balances the speed of a network connection. Slow start gradually increases the amount of data transmitted until it finds the network’s maximum carrying capacity.
How does AIMD detect congestion?
AIMD cuts the congestion window size, cwnd, in half whenever loss is detected by a triple duplicate ACK. AIMD uses observed packet loss to detect congestion. AIMD always cuts the congestion window size, cwnd, in half whenever loss is detected. AIMD is a network-assisted approach to congestion control.