CCNP Routing and Switching ROUTE 300-101 Official Cert Guide

Default Routing to the Internet Router

Consider an enterprise network and its connection to the Internet, as shown in Figure 5-22. For now, the design shows a single Internet-facing router (I1). As is often the case, the entire enterprise in this figure uses private IP addresses. In this case, all enterprise subnets are part of private Class A network 10.0.0.0.

Figure 5-22 Pulling Packets to the Internet Router (I1)

From a design perspective, the entire enterprise can use a default route to forward packets to the Internet. To accomplish this design, the Internet-facing router advertises a default route. All routers flood this default prefix ...