300-320 Question #471: Real Exam Question with Answer & Explanation

The correct answer is B: Eigrp. EIGRP (Enhanced Interior Gateway Routing Protocol) uniquely supports unequal cost load balancing through its variance command. By setting a variance multiplier, EIGRP will install multiple paths into the routing table as long as a path's metric is within the variance factor of th

Question

An engineer is designing an infrastructure to use a 40 Gigabit link as the primary uplink and a 10 Gigabit uplink as the alternate path. Which Routing protocol allows for unequal cost load balancing?

Options

AOspf
BEigrp
CISIS
DBGP
ERIP

Explanation

EIGRP (Enhanced Interior Gateway Routing Protocol) uniquely supports unequal cost load balancing through its variance command. By setting a variance multiplier, EIGRP will install multiple paths into the routing table as long as a path's metric is within the variance factor of the best path's metric. Traffic is then distributed proportionally based on metric. OSPF (A) and IS-IS (C) only perform equal-cost load balancing. BGP (D) selects a single best path by default and does not perform traditional metric-based load balancing. RIP (E) supports only equal-cost load balancing and has no variance concept.

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