When there are multiple routing protocols on a router and metrics do not help, they use the default administrative distance per routing protocol. These are good numbers to memorize for the CCNA test. Cisco may test you on a simple question such as:
What is the administrative distance for RIPv1?
Routing Source Administrative Distance
Connected Routes 0
Static Routes 1
EIGRP 90
IGRP 100
OSPF 110
IS-IS 115
RIP(V1 & V2) 120
Unknown 255
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