What two situations could require the use of multiple routing protocols? (Choose two)

A.
when all equipment is manufactured by Cisco

B.
when there are multiple paths to destination networks

C.
because having multiple routing protocols confuses hackers

D.
when migrating from an older Interior Gateway Protocol (IGP) to a new IGP

E.
when using UNIX host-based routers

F.
when smaller broadcast domains are desired

Explanation:
Simple routing protocols work well for simple networks, but networks grow and become more
complex. While running a single routing protocol throughout your entire IP internetwork is
desirable, multiprotocol routing is common for a number of reasons, including company
mergers, multiple departments managed by multiple network administrators, multivendor
environments, or simply because the original routing protocol is no longer the best choice.
Often, the multiple protocols are redistributed into each other during a migration period from
one protocol to the other.