R1 learned 192.168.12.0/24 via IS-IS, OSPF, RIP, and internal EIGRP. Under normal conditions, which route is installed in the routing table?
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Correct answer: Internal EIGRP.
Why this is the answer
The routing table installs the route with the best administrative distance (AD). Administrative distance is a measure of the trustworthiness of a routing information source. Lower AD values are preferred. For Cisco routers, the default ADs are: Internal EIGRP (90), OSPF (110), IS-IS (115), and RIP (120). Since Internal EIGRP has the lowest AD (90) among the given options, its route to 192.168.12.0/24 will be installed in the routing table. The other protocols have higher ADs, making their routes less preferred in this scenario.
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