Question: In Example 11.3 (Figure 11.12) how many frames are in transit at the same time? Figure 11.12 Receiving node Network Sending node Network Data-link Data-link

In Example 11.3 (Figure 11.12) how many frames are in transit at the same time?

Figure 11.12

Receiving node Network Sending node Network Data-link Data-link Packet Frame Legend Packet ACK Start the timer. Packet S

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

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