Question: In Example 11.4 (Figure 11.13) how many frames are in transit at the same time? Figure 11.13 Sending node Receiving node Network Network Data-link Data-link

In Example 11.4 (Figure 11.13) how many frames are in transit at the same time?

Figure 11.13

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

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