Question: In Example 11.4 (Figure 11.13), assume the round trip time for a frame is 40 milliseconds. Explain what will happen if we set the time-out

In Example 11.4 (Figure 11.13), assume the round trip time for a frame is 40 milliseconds. Explain what will happen if we set the time-out in each of the following cases.

Figure 11.13

Sending node Receiving node Data-link Network Network Data-link Legend Packet Frame 0 Start the timer. Packet ACK 1 D St

a. 35 milliseconds

b. 45 milliseconds

c. 40 milliseconds

Sending node Receiving node Data-link Network Network Data-link Legend Packet Frame 0 Start the timer. Packet ACK 1 D Stop the timer. Packet Frame 1 Restart a time-out timer. Lost Notes: A lost frame means either lost or corrupted. Frame 1 (resent) Packet ACK A lost ACK means either lost or corrupted. Packet Frame 0 Packet ACK 1 Lost Frame 0 (resent) Frame 0 is discarded because the receiver ACK 1 expects frame 1. Time Time Time Time

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