EIGRP Metric vs OSPF Metric

C.

By default, EIGRP metric is calculated: metric = bandwidth + delay While OSPF is calculated by: OSPF metric = Reference bandwidth / Interface bandwidth in bps.

EIGRP (Enhanced Interior Gateway Routing Protocol) and OSPF (Open Shortest Path First) are both routing protocols used to exchange routing information among routers in a network. Both protocols use metrics to determine the best path to a destination network.

The EIGRP metric is calculated based on the cumulative values of bandwidth, delay, reliability, load, and MTU (Maximum Transmission Unit) of the links in the path between the source and destination networks. These values are combined into a single metric called the "composite metric." The composite metric is calculated using the following formula:

composite metric = [K1 * bandwidth + (K2 * bandwidth) / (256 - load) + K3 * delay] * [K5 / (reliability + K4)]

In this formula, K1, K2, K3, K4, and K5 are constants that can be configured to adjust the weight given to each metric.

On the other hand, the OSPF metric is calculated based on two metrics: bandwidth and delay. The bandwidth metric is the inverse of the bandwidth of the link, while the delay metric is the cumulative delay of the link. The OSPF metric is calculated using the following formula:

OSPF metric = (reference bandwidth / minimum bandwidth of the path) + cumulative delay of the path

In this formula, the reference bandwidth is a configurable value that is used as a reference to calculate the bandwidth metric.

Therefore, the correct answer to the question is D: The EIGRP metric is calculated based on hop count and bandwidth. The OSPF metric is calculated on bandwidth and delay. While both protocols consider bandwidth and delay in their metric calculation, EIGRP also considers additional factors like reliability, load, and MTU, and uses a more complex formula to calculate the composite metric. Additionally, EIGRP also includes hop count as a factor in its metric calculation, while OSPF does not.