What is the metric value of the route O 192.168.4.0/24 [110/3] via 10.0.12.2?

The correct metric value of the route O 192.168.4.0/24 [110/3] via 10.0.12.2 is indeed 3. In the context of routing, metrics are values used by routing protocols to determine the best path to a destination.

When examining the notation which includes the "O" indicating it is an OSPF (Open Shortest Path First) route, the numbers in brackets represent two important components: the administrative distance and the metric. The first number, which in this case is 110, represents the administrative distance of the OSPF routing protocol. This value is used to rank the trustworthiness of the routing information received from different protocols.

The second number, which is 3, specifically represents the metric value of the route that OSPF has calculated for reaching the network 192.168.4.0/24. A lower metric typically indicates a preferred path, while a higher metric indicates a less preferred path. In this instance, the metric value of 3 signifies the cost to reach that destination through OSPF, which takes into account various factors according to its calculation algorithms.

The other choices do not align with the routing metric definition; therefore, they