What determines the maximum amount of data that can be sent by TCP?

The maximum amount of data that can be sent by TCP at any given time is determined by the window size. The window size in TCP is part of the flow control mechanism that helps manage the amount of unacknowledged data that can be in transit before requiring an acknowledgment from the receiver. This helps prevent the sender from overwhelming the receiver with too much data at once.

The window size, also known as the TCP window, specifies the number of bytes the sender is allowed to transmit before needing an acknowledgment. It is dynamically adjusted based on network conditions and the receiver's ability to process incoming data. When the sender receives an acknowledgment, it can send more data up to the limits of the current window size.

Other factors such as round trip time, congestion window, and buffer size relate to TCP transmission in different ways but do not directly determine the maximum amount of data that can be sent at once. For example, the round trip time measures the time it takes for a signal to travel to the destination and back, affecting performance but not directly the window size. The congestion window limits the amount of data in transit based on network congestion conditions, while buffer size pertains to a device's ability to hold data temporarily, influencing how much data can be processed. However