300-320 Question #393: Real Exam Question with Answer & Explanation

The correct answer is A: Equal Cost Multi-Path (ECMP). Active-active redundancy means all links forward traffic simultaneously with no standby ports. (A) Equal Cost Multi-Path (ECMP) is a Layer 3 routing technique that load-balances traffic across multiple equal-cost paths, all of which are active at the same time-a link failure simp

Question

A network engineer is designing a network that must incorporate active-active redundancy to eliminate disruption when a link failure occurs between the core and distribution layer. What two technologies will allow this? (Choose two.)

Options

AEqual Cost Multi-Path (ECMP)
BRapid Spanning Tree Protocol Plus (RSTP+)
CHot Standby Routing Protocol (HSRP)
DRapid Spanning Tree Protocol (RSTP)
EEtherChannel (MEC)

Explanation

Active-active redundancy means all links forward traffic simultaneously with no standby ports. (A) Equal Cost Multi-Path (ECMP) is a Layer 3 routing technique that load-balances traffic across multiple equal-cost paths, all of which are active at the same time-a link failure simply removes that path without disruption to the others. (E) EtherChannel (including Multi-chassis EtherChannel/MEC) bundles multiple physical links into a single logical channel where all member links carry traffic; losing one member degrades bandwidth but does not cause a disruption. RSTP and RSTP+ block ports to prevent loops, making them active-standby, not active-active. HSRP is also active-standby by nature (one active gateway, one standby).

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