Question: In Figure 11.12, explain why we need a timer at the sending site, but none at the receiving site. Figure 11.12 Receiving node Network Sending

In Figure 11.12, explain why we need a timer at the sending site, but none at the receiving site.

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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