CompTIA Network+® Study Guide

10.2. Distance-Vector Routing Protocols

Okay—the distance-vector routing algorithm passes complete routing-table contents to neighboring routers, which then combine the received routing-table entries with their own routing tables to complete the router's routing table. This is called routing by rumor, because a router receiving an update from a neighbor router believes the information about remote networks without finding out for itself if it actually is correct.

It's possible to have a network that has multiple links to the same remote network, and if that's the case, the AD of each received update is checked first. As I said, if the AD is the same, the protocol will then have to use other metrics to determine the best path to use to get to ...