Sliding Window Protocols
SENDER:
- Sender maintains a list of consecutive sequence numbers corresponding to frames it is permitted to send. This list, termed the sending window, represents frames sent but not yet ack’d.
- When an ack arrives, the lower edge of the window is advanced to the corresponding sequence number, thereby allowing the sender to transmit new frames. (Note: When receiver sends an ack for frame s, this is understood to mean that all frames up to and including s have been received.)