Which feature is supported by EIGRP but is not supported by OSPF?
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A. B. C. D.B.
The correct answer is B. Unequal-cost load balancing is a feature that is supported by EIGRP but not supported by OSPF.
Explanation:
EIGRP (Enhanced Interior Gateway Routing Protocol) and OSPF (Open Shortest Path First) are both Interior Gateway Protocols (IGPs) that are used to exchange routing information within an autonomous system (AS) and to dynamically calculate the shortest path to a destination network.
Although both EIGRP and OSPF are popular routing protocols, they differ in several ways. One of the differences is in the way they handle load balancing. EIGRP supports both equal-cost and unequal-cost load balancing, while OSPF only supports equal-cost load balancing.
Equal-cost load balancing occurs when a router has multiple paths with the same metric to reach the same destination network. OSPF can load-balance traffic across these equal-cost paths, but it cannot load-balance traffic across paths with different metrics.
Unequal-cost load balancing occurs when a router has multiple paths to reach a destination network, but each path has a different metric. EIGRP can load-balance traffic across these unequal-cost paths, by using a variance value that allows for the selection of paths with metrics that are greater than the least-cost path.
In summary, while EIGRP supports both equal-cost and unequal-cost load balancing, OSPF only supports equal-cost load balancing. Therefore, the correct answer is B.