The administrative distance is used to rate the trustworthiness of the source of a routing information. A lower administrative distance is preferred over a higher one, as it indicates a more reliable source. This concept is essential in selecting routes when multiple protocols provide route information for the same destination.
Here is a quote from Cisco:
Administrative distance is the first criterion that a router uses to determine which routing protocol to use if two protocols provide route information for the same destination. Administrative distance is a measure of the trustworthiness of the source of the routing information
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What are some common administrative distances for different routing protocols?
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How does administrative distance affect network performance and routing decisions?
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Can administrative distance be modified, and if so, how?