3.3.c Compare routing protocol types

3.3.c [i] Distance vector

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 7 hops away, in the direction of next-hop router Y.” 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 may have learned from their neighbors, and so on, distance vector routing is sometimes also referred to as “routing by rumor.”

Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 2650-2655).  . Kindle Edition.