PP Presentation
- With go back n, the receiver lets all the bits coming out of the pipe fall on the floor, sending no acks. This corresponds to a window size of 1.
- With selective repeat, only the bad frame falls on the floor, the rexmit takes a while, but when it does happen, an assembled in-order sequence is passed to the net layer. This corresponds to a window size of larger than 1. If the window is large (e.g. tftp) the buffer can be big (30 MB) esp if the time out time is long.