Cisco CCNA mock exam questions sample test – Question 396

A router is running several routing protocols, and as a result has learned three routes to the 192.168.5.0 network. Below are the details about the three learned routes:

396

Based on this information, which route will be placed in the routing table?

A. the RIP route
B. the OSPF route
C. the EIGRP route
D. all of the routes

Correct Answer: C

Explanation:
The EIGRP route will be placed in the routing table. When a router learns multiple routes to a network from different routing table population methods, which includes routes from routing protocols and static routes created by the administrator, it does so in two steps:
It selects the route with the lowest administrative distance.
If multiple routes exist with equal administrative distance (usually meaning they learned from the same routing protocol), it chooses from the routes by selecting the one with the lowest cost.
Since EIGRP has the lowest default administrative distance (90), the EIGRP route will be chosen.
The RIP route will not be chosen because it has a default administrative distance of 120.
The OSPF route will not be chosen because it has a default administrative distance of 110.

Objective:
Routing Fundamentals
Sub-Objective:
Describe how a routing table is populated by different routing information sources
References:
Support > Technology Support > IP > IP Routing > Troubleshoot and Alerts > Troubleshooting TechNotes > Route Selection in Cisco Routers