TCP FloW Control TCP is a sliding window protocol For window size n, can send up to n bytes without receiving an acknowledgement When the data is acknowledged then the window slides forward Each packet advertises a window size Indicates number of bytes the receiver has space for Original tcp always sent entire window But receiver buffer space I= available net capacity! Congestion control now limits this window= min(receiver window, congestion window) Lecture 17: TCP Congestion Control6 Lecture 17: TCP & Congestion Control TCP Flow Control • TCP is a sliding window protocol • For window size n, can send up to n bytes without receiving an acknowledgement • When the data is acknowledged then the window slides forward • Each packet advertises a window size • Indicates number of bytes the receiver has space for • Original TCP always sent entire window • But receiver buffer space != available net. capacity! • Congestion control now limits this • window = min(receiver window, congestion window)