1They use distance has a measure of the cost of a route. The number of hops in between a router and a destination network determines the distance.
3They periodically send their entire routing table to the neighboring routers. The receiving router then merges its routing table with the received information based on AD and metrics. This process is called routing by rumor since the receiving router believes the information received from the neighbor.
3Distance vector protocols are slower to converge. A network is considered converged when all routers in the network know about all destination networksDistance Vector protocols are relatively easier to configure, manage and troubleshoot. However on the other hand, they consume a lot more bandwidth and CPU because they periodically send out the entire routing table, irrespective of the fact that nothing has changed in between the period. RIP is an example of a distance vector protocol.