300-320 · Question #550
All links between distribution and core layer must be active, how can we archive this goal? Choose two
The correct answer is A. Equal-cost links D. IGP. Equal-cost links and an IGP (Interior Gateway Protocol such as OSPF or EIGRP) are the correct combination. When links between distribution and core are configured with equal cost, an IGP can perform Equal-Cost Multi-Path (ECMP) forwarding, keeping all uplinks simultaneously…
Question
All links between distribution and core layer must be active, how can we archive this goal? Choose two
Options
- AEqual-cost links
- BUnequal-cost links
- CHSRP
- DIGP
- EPVRSTP+
How the community answered
(46 responses)- A78% (36)
- B13% (6)
- C2% (1)
- E7% (3)
Explanation
Equal-cost links and an IGP (Interior Gateway Protocol such as OSPF or EIGRP) are the correct combination. When links between distribution and core are configured with equal cost, an IGP can perform Equal-Cost Multi-Path (ECMP) forwarding, keeping all uplinks simultaneously active and load-balancing traffic across them. HSRP only provides gateway redundancy and does not activate multiple links simultaneously. PVRSTP+ (Per-VLAN Rapid Spanning Tree Plus) is a Layer 2 protocol that actively blocks redundant links to prevent loops, which is the opposite of the goal. Unequal-cost links would cause only one path to be preferred unless EIGRP variance is used, making it less reliable for this requirement.
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