When a router receives multiple routes to the same destination network via different routing protocols, which factor does the router use first to decide which route to install in its routing table?
The route learned most recently
The route with the longest prefix length
The route with the lowest metric
The route with the lowest administrative distance
When a router learns the same destination network from multiple routing protocols, it first considers the administrative distance (AD) of each route. Administrative distance is a value that rates the trustworthiness of a routing source; lower values are preferred. The router selects the route with the lowest AD to install in the routing table. Metrics are used to choose between routes learned via the same routing protocol, not between different protocols. Prefix length determines the specificity of a route but is used after AD when selecting routes. The time a route was learned does not influence route selection.
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