The __________ routing protocol sends distance-vector updates, but it also uses convergence to synchronize routing tables.EIGRPIS-ISOSPFCIDR

Answer

The correct answer is EIGRP (Enhanced Interior Gateway Routing Protocol).

EIGRP is a distance-vector routing protocol that enhances the traditional distance-vector protocol characteristics by incorporating features typically found in link-state protocols. It uses a distance vector algorithm to communicate routing updates but ensures quicker convergence through its use of a Diffusing Update Algorithm (DUAL). This allows EIGRP to synchronize routing tables more efficiently than older protocols, minimizing routing loops and improving the overall stability of the network.

In contrast, IS-IS (Intermediate System to Intermediate System) is a link-state protocol, OSPF (Open Shortest Path First) is also a link-state protocol, and CIDR (Classless Inter-Domain Routing) is not a routing protocol, but a method to allocate IP addresses and routing. Thus, in the context of distance-vector updates and convergence, EIGRP is the only applicable choice.