200-301 · Question #86
When OSPF learns multiple paths to a network, how does it select a route?
The correct answer is C. It divides a reference bandwidth of 100 Mbps by the actual bandwidth of the existing interface to. OSPF selects the best route by calculating the cost of each path, which is derived from the interface bandwidth relative to a reference bandwidth.
Question
When OSPF learns multiple paths to a network, how does it select a route?
Options
- AIt multiple the active K value by 256 to calculate the route with the lowest metric.
- BFor each existing interface, it adds the metric from the source router to the destination to calculate
- CIt divides a reference bandwidth of 100 Mbps by the actual bandwidth of the existing interface to
- DIt count the umber of hops between the source router and the destination to determine the router
How the community answered
(28 responses)- A4% (1)
- B4% (1)
- C86% (24)
- D7% (2)
Why each option
OSPF selects the best route by calculating the cost of each path, which is derived from the interface bandwidth relative to a reference bandwidth.
OSPF does not use K values for metric calculation; K values are associated with EIGRP's metric computation.
OSPF calculates its metric, known as cost, for each interface by dividing a default reference bandwidth of 100 Mbps by the actual bandwidth of that interface. The path with the lowest cumulative cost, which is the sum of the costs of all interfaces along the path, is then preferred as the best route to a destination network.
Concept tested: OSPF metric calculation
Source: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/15804-ospf-k.html
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