quote of the day... distance vector...

distance vector... according to doyle...

routing tcpip vol1

of course you know this, but, so eloquent...

"The name distance vector is derived from the fact that routes are advertised as vectors of (distance, direction), where distance is defined in terms of a metric and direction is defined in terms of the next-hop router. For example, “Destination A is a distance of five hops away, in the direction of next-hop Router X.” As that statement implies, each router learns routes from its neighboring routers’ perspectives and then advertises the routes from its own perspective. Because each router depends on its neighbors for information, which the
neighbors in turn might have learned from their neighbors, and so on, distance vector routing is sometimes facetiously referred to as “routing by rumor.”"

split horizon  do not send updates out the same interface from which those routes were learned

consider everything you study as if for the first time...