When a router has multiple routing table entries matching a destination IP address, how does it decide which route to use?
It selects the route with the lowest administrative distance.
It selects the route with the longest subnet mask.
It selects the route with the lowest routing protocol metric.
It selects the route from the most preferred routing protocol.
A router makes forwarding decisions based on the most specific match, which corresponds to the route with the longest subnet mask. The longer the subnet mask, the more specific the route is to the destination IP address. Administrative distance and routing protocol metrics are used when multiple routes have the same prefix length; however, the router first looks for the most specific match regardless of these values.
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