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CCNA Routing & Switching: Administrative Distance

ost routing protocols have metric structures and algorithms that are not compatible with other protocols. In a network with multiple routing protocols, the exchange of route information and the capability to select the best path across the multiple protocols are critical. Administrative distance is the feature that routers use in order to select the best path when there are two or more different routes to the same destination from two different routing protocols. Administrative distance defines the reliability of a routing protocol. Each routing protocol is prioritized in order of most to least reliable (believable) with the help of an administrative distance value. Prerequisites Requirements Cisco recommends that you have knowledge of these topics: Basics of the routing process. Refer to Routing Basics. Components Used This document is not restricted to specific software and hardware versions. Conventions