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A router can discover routes using dynamic
routing protocols, or routes can be configured manually on the router
by an administrator. After the routes are discovered or
configured, the router must choose which routes are the best routes to
given networks. The
administrative distance of the route is the key information that the
router uses in deciding which is the best path to a particular
destination. The administrative distance is a number that measures the
trustworthiness of the source of the route information. The lower the
administrative distance, the more trustworthy the source.
Different routing protocols have
different default administrative distances.
 If a path
has the lowest administrative distance it is installed in the routing
table. A route is not installed in the routing table if the
administrative distance from another source is lower.
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Lab Activity
e-Lab Activity: Administrative Distance
In this lab, the students will analyze the effects of using
two routing protocols.
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