1. In the underlying model of Fig. 4, it is assumed that packets may be lost by the net-work layer and thus must be individually acknowledged. Suppose that the network layer is 100 percent reliable...

1. In the underlying model of Fig. 4, it is assumed that packets may be lost by the net-work layer and thus must be individually acknowledged. Suppose that the network layer is 100 percent reliable and never loses packets. What changes, if any, are needed to Fig. 4?

Figure 4.
Some forms of e-commerce