TCP Persist What happens if window is 0? Receiver updates window when application reads data What if this update is lost? TCP Persist state Sender periodically sends 1 byte packets Receiver responds with aCK even if it can 't store the packet Lecture 17: TCP Congestion Control10 Lecture 17: TCP & Congestion Control TCP Persist • What happens if window is 0? • Receiver updates window when application reads data • What if this update is lost? • TCP Persist state • Sender periodically sends 1 byte packets • Receiver responds with ACK even if it can’t store the packet