Multiple routes to a destination already exist from various routing protocols.
Which of the following values is used FIRST to select the route that is inserted into the route table?
A.
composite metric
B.
administrative distance
C.
prefix length
D.
hop count
Explanation:
When multiple routes to a destination exist from various routing protocols, the first value to be evaluated is the
administrative distance of the source of the route. The following are examples of default administrative distance
values:
The second value to be compared is the composite metric, or any metric value for that matter. It is only used
when multiple routes exist that have the same administrative distance.
The prefix length is only used to compare two existing routes in the routing table that lead to the destination, yet
have different mask or prefix lengths. In that case, the route with the longest prefix length will be chosen.
Hop count is ONLY used when comparing multiple RIP routes. It is not the first consideration when multiple
routes from various routing protocols exist in a routing table.
Objective:
Routing Fundamentals
Sub-Objective:
Describe how a routing table is populated by different routing information sourcesSupport > Technology Support > IP > IP Routing > Troubleshoot and Alerts > Configuration Example and
TechNotes > Route Selection in Cisco Routers
