Figure 3.22 shows the operation of the GBN protocol for the case of a window
size of four packets. Because of this window size limitation, the sender sends packets 0 through 3 but then must wait for one or more of these packets to be acknowledged before proceeding. As each successive ACK (for example, ACK0 and ACK1)
is received, the window slides forward and the sender can transmit one new packet
(pkt4 and pkt5, respectively). On the receiver side, packet 2 is lost and thus packets
3, 4, and 5 are found to be out of order and are discarded.
Figure 3.22 shows the operation of the GBN protocol for the case of a windowsize of four packets. Because of this window size limitation, the sender sends packets 0 through 3 but then must wait for one or more of these packets to be acknowledged before proceeding. As each successive ACK (for example, ACK0 and ACK1)is received, the window slides forward and the sender can transmit one new packet(pkt4 and pkt5, respectively). On the receiver side, packet 2 is lost and thus packets3, 4, and 5 are found to be out of order and are discarded.
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