Routes for Destination Network | Router Metrics Comparison | Cisco Exam 200-125

# Which Route(s) Will the Router Install in the Routing Table? | Cisco Exam 200-125

### Question

A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20514560.

Another route is from OSPF with a metric of 782. The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table?

### Explanations

Click on the arrows to vote for the correct answer

A. B. C. D. E.

E

The selection of the best path for routing is based on the routing protocol metric. The metric is a value that the router uses to select the best path among several paths to the same destination network.

In this scenario, the router has learned three possible routes to reach a destination network. Each route is advertised by a different routing protocol, and each protocol uses a different metric to calculate the best path.

The router uses the following process to select the best path:

1. It compares the administrative distance of the routes. The route with the lowest administrative distance is preferred. If two routes have the same administrative distance, the router proceeds to step 2.

2. It compares the metrics of the routes. The route with the lowest metric is preferred. If two routes have the same metric, the router proceeds to step 3.

3. It load-balances across the multiple paths.

Let's compare the routes:

• The EIGRP route has a metric of 20514560.
• The OSPF route has a metric of 782.
• The RIPv2 route has a metric of 4.

The administrative distance of all three routes is the default value for their respective protocols:

• EIGRP: 90
• OSPF: 110
• RIPv2: 120

Based on the above information, the router will install the route with the lowest metric into its routing table. Therefore, the router will install the RIPv2 route with a metric of 4 into the routing table because it has the lowest metric of all three routes.

Therefore, the correct answer is A. the RIPv2 route.