Picture of Go-back-n/Sliding Window

Sender

Receiver

Send 1, set timer 1

Receive 1, send ACK

Cancel timer 1, send 4

Send 7

Time

Send 2, set timer 2

Send 3, set timer 3

Receive 2, send ACK

Receive 3, send ACK

Cancel timer 2, send 5

Cancel timer 3, send 6

Timer 6 expires, re-send 6

Timer 5 expires, re-send 5

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