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, send the first three frames to the receiver, i.e., 1, 2, 3 and now the sender is expected to receive the acknowledgment of the 1^st frame.
2. After ACK 1 received, select the next frame to be sent i.e., 4^th frame.
3. ACK 2 not received because the acknowledgment is lost, retransmit the frame i.e., 2.
4. After ACK 3 received, select the next frame to be sent i.e., 5.
5. NACK received, retransmit the frame i.e., 4.
6. After ACK 2 received, select the next frame to be sent i.e., 6^th frame.
7. After ACK 5 received, select the next frame to be sent i.e., 7^th frame.
8. After ACK 4 received, select the next frame to be sent i.e., 8^th frame.
9. After ACK 6 received, select the next frame to be sent i.e., 9^th frame.
10. After ACK 7 received, select the next frame to be sent i.e., 10^th frame.
11. After NACK received, retransmit the frame i.e., 8.
12. ACK received, ALL FRAMES SENT!
13. Input the correct total number of frames transmitted and click the Submit button.