• A timeout event. The protocol’s name, “Go-Back-N,” is derived from the sender’s
behavior in the presence of lost or overly delayed packets. As in the stop-and-wait
protocol, a timer will again be used to recover from lost data or acknowledgment
packets. If a timeout occurs, the sender resends all packets that have been previously sent but that have not yet been acknowledged. Our sender in Figure 3.20 uses
only a single timer, which can be thought of as a timer for the oldest transmitted but
not yet acknowledged packet. If an ACK is received but there are still additional
transmitted but not yet acknowledged packets, the timer is restarted. If there are no
outstanding, unacknowledged packets, the timer is stopped.
• A timeout event. The protocol’s name, “Go-Back-N,” is derived from the sender’s behavior in the presence of lost or overly delayed packets. As in the stop-and-wait protocol, a timer will again be used to recover from lost data or acknowledgment packets. If a timeout occurs, the sender resends all packets that have been previously sent but that have not yet been acknowledged. Our sender in Figure 3.20 uses only a single timer, which can be thought of as a timer for the oldest transmitted but not yet acknowledged packet. If an ACK is received but there are still additional transmitted but not yet acknowledged packets, the timer is restarted. If there are no outstanding, unacknowledged packets, the timer is stopped.
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