When a router receives identical route information from different routing protocols, what does it use to determine which route to place in the routing table?
When a router learns the same route from multiple routing protocols, it uses administrative distance to determine which route is more trustworthy. Administrative distance (AD) assigns a numerical value to each routing protocol; the lower the AD, the more preferred the route. Metrics are used to select the best path within a single routing protocol but cannot compare routes from different protocols, so they are not used in this situation.
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Cisco CCNA 200-301
IP Connectivity
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