300-320 · Question #393
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…
The correct answer is A. Equal Cost Multi-Path (ECMP) E. EtherChannel (MEC). 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…
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)
How the community answered
(24 responses)- A75% (18)
- B13% (3)
- C8% (2)
- D4% (1)
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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