Which choice below is the earliest and the most commonly found Interior Gateway Protocol?

A.
OSPF

B.
RIP

C.
IGRP

D.
EAP

Explanation:

The Routing Information Protocol (RIP) bases its routing path on the distance (number of hops) to
the destination. RIP maintains optimum routing paths by sending out routing update messages if the
network topology changes. For example, if a router finds that a particular link is faulty, it will update
its routing table, then send a copy of the modified table to each of its neighbors. * the Open Shortest
Path First (OSPF) is a link-state hierarchical routing algorithm intended as a successor to RIP. It
features least-cost routing, multipath routing, and load balancing. * the Internet Gateway Routing
Protocol (IGRP) is a Cisco protocol that uses a composite metric as its routing metric, including
bandwidth, delay, reliability, loading, and maximum transmission unit. * the Extensible
Authentication Protocol (EAP), is a general protocol for PPP authentication that supports multiple
remote authentication mechanisms. Source: Introduction to Cisco Router Configuration edited by
Laura Chappell (Cisco Press, 1999).