A router has multiple routes to the same destination network from different routing protocols and a directly connected interface. Without any changes to default administrative distances, which path will the router choose to forward the packets?
The route learned from the routing protocol with the lowest metric
The route with the longest subnet mask
The route with the highest administrative distance
When a router has multiple routes to the same destination, it uses the administrative distance (AD) to select the most trustworthy route. The lower the AD, the more preferred the route. A directly connected interface has an AD of 0, which is lower than any route learned from dynamic routing protocols. Therefore, the router will prefer the directly connected route over any routes learned from routing protocols.
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What is Administrative Distance (AD)?
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How does a directly connected interface differ from other routes?
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Why is a lower Administrative Distance (AD) preferred over a higher one?
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Cisco CCNA 200-301
IP Connectivity
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