TCP Tahoe and TCP Reno are two distinct forms of TCP congestion control algorithms. They differ in their responses to the receipt of three duplicate acknowledgments (acks).

TCP Tahoe conducts a fast retransmit and reduces the slow start threshold (ssthresh) value to the original congestion window size. It sets the new window size to 1 and remains in slow start mode.

In contrast, TCP Reno enters fast recovery mode upon receiving three duplicate acks. It also reduces the ssthresh value but increases the congestion window (cwind) for each subsequent duplicate ack. If a timeout occurs, Reno transitions to congestion avoidance or slow start.

Although there are differences in their congestion control mechanisms, both Tahoe and Reno are forms of TCP congestion control specifically designed to handle the receipt of three duplicate acks.

Tahoe utilizes a fast retransmit and halves the ssthresh value, while Reno employs fast recovery and increments cwind for each successive duplicate ack.

TCP Tahoe vs TCP Reno

TCP Tahoe and TCP Reno are two different forms of TCP congestion control that handle the receiving of 3 duplicate acks in distinct ways.

TCP Tahoe, being the predecessor to Reno, performs a fast retransmit and halves the ssthresh value to the original congestion window size. It sets the new window size to 1 and stays in slow start.

On the other hand, TCP Reno goes into fast recovery mode upon receiving three duplicate acks. It also halves the ssthresh value and increases cwind for each successive duplicate acks.

Additionally, Reno moves to congestion avoidance or slow start upon a timeout.

Therefore, TCP Tahoe and Reno differ in their behavior towards 3-dup-ack and timeout, making them two different forms of TCP congestion control.

Handling 3 duplicate acks

Both Tahoe and Reno respond differently to the receipt of 3 duplicate acknowledgments.

TCP Tahoe performs a fast retransmit and halves the slow start threshold (ssthresh) value to the original congestion window size. It sets the new window size to 1 and remains in slow start.

On the other hand, TCP Reno enters fast recovery mode when it receives three duplicate acks. Similar to Tahoe, it halves the ssthresh value, but Reno also increases the congestion window (cwind) for each successive duplicate ack. Reno transitions to congestion avoidance or slow start upon a timeout.

These differences in handling 3 duplicate acks demonstrate how TCP Tahoe and TCP Reno have distinct approaches to congestion control.

Differences in congestion control

Tahoe and Reno have contrasting strategies for managing network congestion.

While both algorithms handle congestion caused by receiving 3 duplicate acks, they differ in their approach.

TCP Tahoe implements a conservative approach by performing a fast retransmit and reducing the ssthresh (slow start threshold) value to the original congestion window size. It sets the new window size to 1 and remains in slow start mode.

In contrast, TCP Reno adopts a more aggressive strategy. It enters fast recovery mode upon receiving three duplicate acks, where it halves the ssthresh value and increases the congestion window (cwind) for each subsequent duplicate ack. Additionally, Reno switches to congestion avoidance or slow start after a timeout.

These differences in behavior make Tahoe and Reno distinct forms of TCP congestion control mechanisms.