ABSTRACT
A stationary computer typically connects to the Internet through a home/ office gateway and the Internet service provider’s (ISP’s) router as shown in Figure 5.1. The connection between the computer and the gateway, and between the gateway and the ISP router are typically fixed-line links. For example, the computer could be connected to the gateway through an Ethernet cable, and the gateway to the ISP router through a telephone line or broadband cable. Such wired connections greatly limit the mobility of the computer.
