You need to configure a single router into load balancing traffic across 4 unequal cost paths. Which routing protocols can satisfy this requirement?

A. RIP v1
B. RIP v2
C. IGRP
D. EIGRP
E. OSPF
F. IS-IS


Answer: C, D

Explanation:
In general, load balancing is the capability of a router to distribute traffic over all its network ports that are the same distance from the destination address. Load balancing increases the utilization of network segments, thus increasing effective network bandwidth. There are two types of load balancing: equal cost path and unequal cost path.
Every routing protocol supports equal cost path load balancing. In addition to that, IGRP and EIGRP also support unequal cost path load balancing, which is known as variance. The variance command instructs the router to include routes with a metric less than n times the minimum metric route for that destination, where n is the number specified by the variance command. The variable n can take a value between 1 and 128, with thedefault being 1, which means equal cost load balancing (variance for example. Traffic is also distributed proportionally among unequal cost links, with respect to the metric.
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