Follow these steps:
NOTE: For better understanding we have not used the sequence number for representing frames instead we have taken the running serial number i.e., 1,2,3,4,5,6....
1. Firstly, select the first three frames to be sent to the receiver, i.e., 1,2,3 and now wait to receive the acknowledgment of the 1st frame.
2. After ACK 1 received, select the next frame to be sent i.e.,4.
3. ACK 2 lost in between, retransmit all the frames of the current window i.e., 2,3,4.
4. After ACK 2 received, select the next frame to be sent i.e.,5.
5. After ACK 3 received, select the next frame to be sent i.e.,6.
6. After ACK 4 received, select the next frame to be sent i.e.,7.
7. ACK 5 not received, retransmit all the frames of the current window.
8. After ACK 5,6,7 received, select the next three frames to be sent.
9. ACK 8,9,10 received, ALL FRAMES SENT!
10. Input the correct total number of frames transmitted and click the Submit button.
11. Select other window size to perform simulation.