to those subnets can be sent directly to hosts in those subnets. The Next Router field for the
routes learned from Router A show Router A's IP address as the next router, as described
previously. (A route learned from a neighboring router is assumed to be through that router.)
Router B typically learns Router A's IP address for these routes by simply looking at the source
IP address of the routing update.
with a higher metric. For example, an update received on serial 1 lists a subnet with metric 5.
Before advertising that subnet in an update sent out some other interface, the router adds to the
metric, based on a value associated with serial 1. With RIP, because hop count is the metric, the
advertised metric would be 6, in this case. Figure 6-3 and Table 6-4 illustrate the concept.