CCNA: Cisco Certified Network Associate — Question 23

When OSPF learns multiple paths to a network, how does it select a route?

Answer options

• A. For each existing interface, it adds the metric from the source router to the destination to calculate the route with the lowest bandwidth.
• B. It counts the number of hops between the source router and the destination to determine the route with the lowest metric.
• C. It divides a reference bandwidth of 100 Mbps by the actual bandwidth of the exiting interface to calculate the route with the lowest cost.
• D. It multiplies the active K values by 256 to calculate the route with the lowest metric.

Correct answer: C

Explanation

The correct answer is C because OSPF uses the formula of dividing a reference bandwidth by the actual bandwidth to compute the route cost, which helps in selecting the best path. Option A is incorrect as it misrepresents the selection process by mentioning bandwidth instead of cost. Option B incorrectly states that OSPF counts hops, which is not the primary metric used. Option D is incorrect as it refers to K values, which are not directly used in determining the cost of paths in OSPF.